Toyota Tundra Service Manual: Diagnosis System

Toyota Tundra Service Manual / Power Source, Network / Can Communication / Can Communication System / Diagnosis System

DIAGNOSIS SYSTEM

CHECK FOR INSTALLED SYSTEMS (ECUS AND SENSORS) THAT USE CAN COMMUNICATION

(a) The systems (ECUs and sensors) that use CAN communication vary depending on the vehicle and optional equipment. Check which systems (ECUs and sensors) are installed to the vehicle.

Connected to	Code	ECU/Sensor Name	Techstream Display	Applicability
-	CGW	Central gateway ECU (network gateway ECU)	-	Installed on all vehicles
V Bus	DLC3	DLC3	-	Installed on all vehicles
Bus 1	F-CAM	Forward recognition camera	Front Camera Module	w/ Pre-collision System
	F-MR	Millimeter wave radar sensor assembly	Front Radar	w/ Pre-collision System
	BSM	Blind spot monitor sensor RH	Blind Spot Monitor Master	w/ Blind Spot Monitor System
Bus 2	ENG	ECM	ECM (Engine)	Installed on all vehicles
Bus 3	AV	Radio and display receiver assembly	Display and Navigation (AVN)	w/ Audio and Visual System
Bus 3	AV	Navigation receiver assembly	Display and Navigation (AVN)	w/ Navigation System
Bus 4	TBC	Brake control with bracket relay	Trailer Brake Controller	w/ Trailer Brake Control System
	AWD	4 wheel drive control ECU (4WD control ECU)	Four Wheel Drive Control	for 4WD
	BRK	Brake actuator assembly (skid control ECU)	Skid Control (ABS/VSC/TRAC)	Installed on all vehicles
	STR	Spiral with sensor cable sub-assembly (steering angle sensor)	Spiral cable (Steering Angle Sensor)	Installed on all vehicles
	TPMS	Tire pressure warning ECU and receiver	Tire Pressure2	Installed on all vehicles
	SRS	Airbag sensor assembly	Airbag	Installed on all vehicles
Bus 5	MB	Main body ECU (multiplex network body ECU)	Main Body	Installed on all vehicles
	A/C	Air conditioning amplifier assembly	Air Conditioning Amplifier	Installed on all vehicles
	MET	Combination meter assembly	Combination Meter	Installed on all vehicles
Sub Bus 1	MB	Main body ECU (multiplex network body ECU)	Main Body	Installed on all vehicles
	DST	Front power seat switch LH (power seat control ECU)	D-Seat	w/ Seat Memory
	DFL	Outer mirror control ECU assembly LH	Front Door LH/L-Mirror (FL-Door 2/L-Mirror)	w/ Seat Memory
	DFR	Outer mirror control ECU assembly RH	Front Door RH/R-Mirror (FR-Door 2/R-Mirror)	w/ Seat Memory
	T&T	Multiplex tilt and telescopic ECU	Multiplex Tilt and Telescopic	w/ Seat Memory

CAN BUS CHECK

HINT:

The ECUs and sensors that are properly connected to the CAN communication system can be displayed using the Techstream.

(a) Using the Techstream, select the CAN Bus Check screen.

NOTICE:

It may be possible to select buses that do not have ECUs or sensors from the bus selection pull-down menu. This is not a malfunction. (This occurs when optional devices are not on a sub bus that is monitored by a gateway function equipped ECU.)
In the bus selection pull down menu, all buses applicable to the model are displayed (e.g. LIN communication buses are also displayed). Therefore, refer to the wiring diagrams to check the names of sub buses for CAN communication.
Click here

HINT:

Different connection statuses are indicated by the background color of ECUs and sensors that are displayed.

Explanation of CAN Bus Check Screen

Bus Type	Background Color	Connection Status
Bus	White	Communication has been normal.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Currently not communicating (either of the following): Not communicating since the start of the CAN bus check Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Either of the following: The central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the Techstream.4 No ECUs or sensors are connected to the bus.5
Sub bus with a gateway function equipped ECU that does not memorize connected ECUs or sensors*2	White	Communication has been normal since the start of the CAN bus check.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Communication stop has continued since the start of the CAN bus check.*1
Sub bus with a gateway function equipped ECU that memorizes connected ECUs and sensors*3	White	Communication has been normal.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Currently not communicating (either of the following): Not communicating since the start of the CAN bus check Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Either of the following: The gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU).6 No ECUs or sensors are connected to the sub bus.7

Gateway function equipped ECUs relay signals between ECUs and sensors connected to different buses.
*1: An ECU or sensor is installed to the vehicle but is not displayed on the "Communication Bus Check" screen.
*2: The gateway function equipped ECU does not memorize ECUs and sensors connected to its respective sub bus.
*3: The gateway function equipped ECU memorizes ECUs and sensors connected to its respective sub bus.
*4: When the central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the Techstream, the name of buses, sub buses, ECUs and sensors will not be displayed.
*5: When no ECUs or sensors are connected to a bus, the message "There is no system found on the communication Bus." will be displayed.
*6: When a gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU), the name of sub buses and ECUs or sensors connected to the sub bus will not be displayed.
*7: When no ECUs or sensors are connected to the sub bus, the message "There is no system found on the communication Bus." will be displayed.
If there is no communication between the Techstream and the vehicle, or no ECUs or sensors are displayed as connected, check the central gateway ECU (network gateway ECU) and V bus (the bus that connects the DLC3 to the central gateway ECU [network gateway ECU]) for malfunctions.

(b) Observe the connection response screen for approximately 2 minutes to check for a change in connection status of the connected ECUs and sensors.

HINT:

If an open occurs in one of the lines of a CAN branch (except DLC3), output from the other branch line (the line that is not open) will be unstable and it may interfere with the response (display) of other ECUs and sensors.
If the connection status changes during the inspection, repair the open in the branch line of the ECU or sensor that does not respond (is not detected) and then perform the CAN bus check again.

HOW TO INTERPRET CAN BUS CHECK SCREEN

(a) When a communication stop is currently occurring, the probable malfunctioning part can be determined from the CAN bus check and by using the following methods.

NOTICE:

The following CAN bus wiring diagram is provided only as an example. This wiring diagram is different from the actual wiring diagram for this vehicle.

HINT:

When a communication stop is currently occurring, it is easier to determine the probable malfunctioning part from the CAN bus check rather than from communication DTCs.
Wait for approximately 2 minutes after turning the ignition switch ON (or simulate the driving conditions that enable the malfunction to be reproduced) and select "CAN Bus Check". Then observe the communication status of each ECU on the screen.

(b) If a communication error of only 1 ECU or sensor is indicated on the CAN Bus Check screen, a communication stop of the ECU or sensor is suspected.

Example: Open in both CAN branch lines of HV on the bus 4

*a	Bus 2	*b	Bus 4
*c	Sub Bus	*d	V Bus
*e	Location of Malfunction	*f	Background color is red

HINT:

When there are communication stops, ECUs that are present in the vehicle may not be displayed on the CAN Bus Check screen.

(c) If communication errors for multiple ECUs or sensors are indicated on the CAN Bus Check screen, then a communication stop of the ECU or sensor that shows a more serious communication stop (an ECU or sensor whose background color is red) is suspected.

Example: Open in a CAN branch line for HV on the bus 4

*a	Background color is red	*b	Background color intermittently becomes yellow or red
*c	Not displayed or background color is yellow or red	-	-

Explanation of CAN Bus Check Screen

Bus Type	Background Color	Connection Status
Bus	White	Communication has been normal.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Currently not communicating (either of the following): Not communicating since the start of the CAN bus check Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Either of the following: The central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the Techstream.4 No ECUs or sensors are connected to the bus.5
Sub bus with a gateway function equipped ECU that does not memorize connected ECUs or sensors*2	White	Communication has been normal since the start of the CAN bus check.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Communication stop has continued since the start of the CAN bus check.*1
Sub bus with a gateway function equipped ECU that memorizes connected ECUs and sensors*3	White	Communication has been normal.
	Yellow	Communication stop occurred at least once since the start of the CAN bus check, but communication is currently occurring (unstable communication).
	Red	Currently not communicating (either of the following): Not communicating since the start of the CAN bus check Communication occurred at least once since the start of the CAN bus check, but is currently not occurring.
	Not displayed	Either of the following: The gateway function equipped ECU cannot communicate with the central gateway ECU.6 No ECUs or sensors are connected to the sub bus.7

Gateway function equipped ECUs relay signals between ECUs and sensors connected to different buses.
*1: An ECU or sensor is installed to the vehicle but is not displayed on the "Communication Bus Check" screen.
*2: The gateway function equipped ECU does not memorize ECUs and sensors connected to its respective sub bus.
*3: The gateway function equipped ECU memorizes ECUs and sensors connected to its respective sub bus.
*4: When the central gateway ECU (network gateway ECU) has an internal malfunction or cannot communicate with the Techstream, the name of buses, sub buses, ECUs and sensors will not be displayed.
*5: When no ECUs or sensors are connected to a bus, the message "There is no system found on the communication Bus." will be displayed.
*6: When a gateway function equipped ECU cannot communicate with the central gateway ECU (network gateway ECU), the name of sub buses and ECUs or sensors connected to the sub bus will not be displayed.
*7: When no ECUs or sensors are connected to the sub bus, the message "There is no system found on the communication Bus." will be displayed.
The example of the CAN Bus Check screen in the illustration shows the result of electrical noise on the CAN bus which is caused by an open in a CAN branch line of HV is also unstable. In addition, in this example, MB is equipped with a gateway function. Therefore, communication is also unstable between the Sub bus ECUs of MB and the bus 4.
The example in the illustration shows that HV has a red background color on the CAN Bus Check screen. This indicates a more significant communication stop. In this case, a communication stop of HV is suspected.

(d) If a communication error is indicated on both the bus 4 and Sub bus on the CAN Bus Check screen, suspect any communication stop displayed for the bus 4 first.

Example: Open in both CAN branch lines of MB on the bus 4

Background color is red

Not displayed

HINT:

In the CAN bus check, it is possible to confirm the communication status of ECUs connected to the bus after connecting the Techstream to the DLC3. As for sub bus, it is possible to confirm which sub bus connected ECUs can communicate with a gateway function equipped ECU on the bus.
If a gateway function equipped ECU has a communication error, ECUs connected to the gateway function equipped ECU are also affected, and communication stops will be indicated.
The CAN Bus Check screen in the illustration shows that MB has a gateway function and a communication stop in MB is suspected.

(e) If the CAN Bus Check screen indicates a communication stop only in the sub bus, a communication stop in the sub bus is suspected.

Example: Open in both CAN branch lines of MIR-R on the sub bus

Background color is red

HINT:

A communication error in a sub bus does not affect the other buses.
When a gateway function equipped ECU has memorized the ECUs that are connected to the sub bus, if any of the ECUs connected to the gateway function equipped ECU has a communication error, the background color changes to yellow or red. (The displayed name will not disappear.)

(f) If both of the bus 2 main bus lines are open, ECUs or sensors that are located farther away from the central gateway ECU (network gateway ECU) than the open part will be displayed as a communication stop on the CAN Bus Check screen.

(In this case, HVB, R-MGC and ENG background color changes to red.)

*a	Bus 2	*b	Bus 4
*c	Sub Bus	*d	V Bus
*e	Location of Malfunction	*f	Background color is red

HINT:

If a communication error occurs in an ECU, it is not displayed on the CAN Bus Check screen even though the ECU is present.

(g) If both of the sub bus main bus lines are open, ECUs that are located farther away from the gateway function equipped ECU than the open part will be displayed as a communication stop on the CAN Bus Check screen.

(In this case, MIR-L background color changes to red.)

*a	Bus 2	*b	Bus 4
*c	Sub Bus	*d	V Bus
*e	Location of Malfunction	*f	Background color is red

(h) When any of the following malfunctions occur, CAN communication cannot be established and almost all ECUs and sensors on the bus show a communication error on the CAN Bus Check screen.

Details of Malfunction

Short between CAN lines (CANH and CANL)

Short between a CAN line (CANH or CANL) and +B

Short between a CAN line (CANH or CANL) and ground

Open in a CAN main bus line

*a	When any of the following malfunctions occur on the bus 4	*b	When any of the following malfunctions occur on a sub bus
*c	Background color is red	*d	Not displayed

HINT:

When a malfunction occurs in the bus, almost all ECUs and sensors on the bus and sub bus indicate a communication error (almost all ECUs are not displayed). As communication with the gateway function equipped ECU that is connected to the bus stops, communication from the ECUs connected to the sub bus that is monitored by the gateway function equipped ECU also stops (these ECUs are not displayed).
When a malfunction occurs in a sub bus, almost all ECUs connected to the sub bus indicate a communication error.
A communication error in a sub bus does not affect the other buses.
The malfunctioning part can be determined by checking for a short circuit between CAN bus lines or between a CAN bus line and ground or +B short using an electrical tester.

(i) If a communication error of all ECUs and sensors is indicated on the CAN Bus Check screen, a communication stop of the V bus (DLC3 - central gateway ECU [network gateway ECU]) is suspected.

Open in both CAN branch lines in the V bus

*a	Bus 2	*b	Bus 4
*c	Sub Bus	*d	V Bus
*e	Location of Malfunction	*f	Not displayed

HINT:

When there is no communication between the Techstream and the vehicle, no ECUs or sensors will be displayed.

DTC TABLE BY ECU

HINT:

In the CAN communication system, the CAN communication DTCs of each ECU can be displayed using the Techstream.
If CAN communication system DTCs are output, the malfunction cannot be determined only by the DTCs. Perform troubleshooting according to How to Proceed with Troubleshooting.
Click here
If there is a malfunction currently, DTCs can be checked by performing steps in the DTC check procedure.

(a) ECM

HINT:

This ECU uses the CAN communication system for DTC communication.

(1) Techstream Display "Engine and ECT"

DTC

Detection Item

DTC Detection Condition

DTC Detection Pre-condition

DTC Check Procedure

Warning Displayed

DTC Storage Method

Indication in Meter

Multi-information Display

U0155

Lost Communication with Instrument Panel Cluster Control Module (Combination Meter)

Communication stop occurs between ECM and combination meter assembly continuously for approximately 3 seconds or more.

All conditions are met:

1 second or more elapse after the ignition switch is ON.
The power source voltage of the ECM is 10.5 V or more.

Turn the ignition switch to ON and wait at least approximately 4 seconds.

DTC is stored until it is cleared using the Techstream.

(2) Techstream Display "Radar Cruise1" (w/ Radar Cruise Control System)

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	Communication stop occurs between the ECM and brake actuator assembly (skid control ECU) for approximately 1 second or more.	All conditions are met: 1 second or more elapse after the ignition switch is ON. The cruise control main switch is on. The power source voltage of the ECM is 10.5 V or more.	Turn the cruise control main switch on and wait at least approximately 2 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0122	Lost Communication with Vehicle Dynamics Control Module	Communication stop occurs between the ECM and brake actuator assembly (skid control ECU) for approximately 3 seconds or more.	All conditions are met: 1 second or more elapse after the ignition switch is ON. The cruise control main switch is on. The power source voltage of the ECM is 10.5 V or more.	Turn the cruise control main switch on and wait at least approximately 4 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0137	Lost Communication with TBC ECU	Communication stop occurs between the ECM and brake control with bracket relay for approximately 2 seconds or more.	All conditions are met: After the ignition switch is ON, ECM receive data from the brake control with bracket relay 1 time or more. The cruise control main switch is on. Vehicle speed is 36 km/h (22 mph) or more. The power source voltage of the ECM is 10.5 V or more.	Drive the vehicle at a speed of 36 km/h (22 mph) or more for approximately 2 seconds or more.	-	-	DTC is stored until it is cleared using the Techstream.
U1104	Lost Communication with Driving Support ECU	Communication stop occurs between the ECM and millimeter wave radar sensor assembly for approximately 1 second or more.	All conditions are met: 1 second or more elapse after the ignition switch is ON. The cruise control main switch is on. The power source voltage of the ECM is 10.5 V or more.	Turn the cruise control main switch on and wait at least approximately 2 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.

(b) Brake Actuator Assembly (Skid Control ECU) / Techstream Display "ABS/VSC/TRAC"

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0073	Control Module Communication Bus Off	A communication error (bus-off status) occurs consecutively for approximately 1 second or more.	All conditions are met: Approximately 2 seconds or more elapse after the ignition switch is ON. The power source voltage of the brake actuator assembly (skid control ECU) is 9.8 to 17.4 V.	Turn the ignition switch ON and wait for at least approximately 3 seconds.	ABS warning light illuminates. Brake warning light illuminates.	-	DTC remains stored only while malfunction is occurring.
U0100	Lost Communication with ECM / PCM	Either of the following conditions is met: Communication stop occurs between the brake actuator assembly (skid control ECU) and ECM for 1 second or more. Communication stop occurs between the brake actuator assembly (skid control ECU) and ECM for 2 seconds or more.	All conditions are met: Approximately 2 seconds or more elapse after the ignition switch is ON. Vehicle speed is 3 km/h (2 mph) or more. The power source voltage of the brake actuator assembly (skid control ECU) is 9.8 to 17.4 V.	Drive the vehicle at a speed of 3 km/h (2 mph) or more for approximately 4 seconds or more.	Brake warning light illuminates.	-	DTC remains stored only while malfunction is occurring.
U0114	Lost Communication with 4WD Control ECU	Communication stop occurs between the brake actuator assembly (skid control ECU) and 4 wheel drive control ECU (4WD control ECU) for 1 second or more.	All conditions are met: Approximately 2 seconds or more elapse after the ignition switch is ON. The power source voltage of the brake actuator assembly (skid control ECU) is 9.8 to 17.4 V.	Turn the ignition switch ON and wait for at least approximately 3 seconds.	Brake warning light illuminates.	-	DTC remains stored only while malfunction is occurring.
U0123	Lost Communication with Yaw Rate Sensor Module	Communication stop occurs between the brake actuator assembly (skid control ECU) and airbag sensor assembly for approximately 1 second or more.	All conditions are met: Approximately 2 seconds or more elapse after the ignition switch is ON. Vehicle speed is 3 km/h (2 mph) or more. The power source voltage of the brake actuator assembly (skid control ECU) is 9.8 to 17.4 V.	Drive the vehicle at a speed of 3 km/h (2 mph) or more for approximately 3 seconds or more.	ABS warning light illuminates. Brake warning light illuminates.	-	DTC remains stored only while malfunction is occurring.
U0126	Lost Communication with Steering Angle Sensor Module	Communication stop occurs between the brake actuator assembly (skid control ECU) and spiral with sensor cable sub-assembly (steering angle sensor) for 1 second or more.	All conditions are met: Approximately 2 seconds or more elapse after the ignition switch is ON. Vehicle speed is 3 km/h (2 mph) or more. The power source voltage of the brake actuator assembly (skid control ECU) is 9.8 to 17.4 V.	Drive the vehicle at a speed of 3 km/h (2 mph) or more for approximately 3 seconds or more.	Brake warning light illuminates.	-	DTC remains stored only while malfunction is occurring.

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0073	Bus Off	A communication error (bus-off status) occurs consecutively.	All conditions are met: The ignition switch is ON. The power source voltage of the brake control with bracket relay is 10.2 V to 17.3V.	Turn the ignition switch to ON and wait at least 3 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0123	Lost Communication With Yaw Rate Sensor	Communication stop occurs between the brake control with bracket relay and airbag sensor assembly.	All conditions are met: 1 seconds or more elapse after the ignition switch is ON. Vehicle speed is 6 km/h (3 mph) or more.	Drive the vehicle at a speed of 6 km/h (3 mph) or more for approximately 1 seconds or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0129	Lost Communication With VSC	Communication stop occurs between the brake control with bracket relay and brake actuator assembly (skid control ECU) continuously for 1 second or more.	3 seconds or more elapse after the ignition switch is ON.	Turn the ignition switch to ON and wait at least approximately 3 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0155	Lost Communication With Combination Meter	Communication stop occurs between the brake control with bracket relay and combination meter assembly continuously for approximately 4 seconds or more.	5 seconds or more elapse after the ignition switch is ON.	Turn the ignition switch to ON and wait at least approximately 9 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.

(d) 4 Wheel Drive Control ECU (4WD Control ECU) / Techstream Display "Four Wheel Drive" (for 4WD)

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
*: Refer to Touch Select 2-4 and High-low System Click here
U0100	Lost Communication with ECM/PCM "A"	Either of the following conditions is met: Communication stop occurs between the 4 wheel drive control ECU (4WD control ECU) and ECM continuously for approximately 1 second or more. Communication stop occurs between the 4 wheel drive control ECU (4WD control ECU) and ECM continuously for approximately 6 seconds or more.	All conditions are met: Approximately 1 second or more elapse after the ignition switch is ON. The power source voltage of the 4 wheel drive control ECU (4WD control ECU) is 9.5 V or more.	Turn the ignition switch to ON and wait at least approximately 7 seconds.	4WD indicator light blinks 4LO indicator light blinks	-	DTC is stored until it is cleared using the Techstream.
U0122	Lost Communication With Vehicle Dynamics Control Module	Communication stop occurs between the 4 wheel drive control ECU (4WD control ECU) and brake actuator assembly (skid control ECU) continuously for approximately 1 second or more.	All conditions are met: Approximately 1 second or more elapse after the ignition switch is ON. The power source voltage of the 4 wheel drive control ECU (4WD control ECU) is 9.5 V or more.	Turn the ignition switch to ON and wait at least approximately 2 seconds.	4WD indicator light blinks 4LO indicator light blinks	-	DTC is stored until it is cleared using the Techstream.
U0416*	Invalid Data Received From Vehicle Dynamics Control Module	Communication stop occurs between the 4 wheel drive control ECU (4WD control ECU) and brake actuator assembly (skid control ECU) continuously for approximately 1 second or more.	All conditions are met: Approximately 1 second or more elapse after the ignition switch is ON. The power source voltage of the 4 wheel drive control ECU (4WD control ECU) is 9.5 V or more.	Turn the ignition switch to ON and wait at least approximately 2 seconds.	4WD indicator light blinks 4LO indicator light blinks	-	DTC is stored until it is cleared using the Techstream.

(e) Multiplex Tilt and Telescopic ECU / Techstream Display "Tilt&Telescopic" (w/ Seat Memory)

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
*: Refer to Power Tilt and Power Telescopic Steering Column System Click here
U0142	Lost Communication with Body Control Module "B" Missing Message	Either of the following conditions is met: Communication stop occurs between the multiplex tilt and telescopic ECU and main body ECU (multiplex network body ECU) continuously for approximately 4 seconds or more. Communication stop occurs between the multiplex tilt and telescopic ECU and main body ECU (multiplex network body ECU) continuously for 10 seconds or more.	The power source voltage of the multiplex tilt and telescopic ECU is 9 V or more.	Wait at least 10 seconds with the power source voltage of the multiplex tilt and telescopic ECU at 9 V or more.	-	-	DTC is stored until it is cleared using the Techstream.
U0208	Lost Communication with "Seat Control Module A" Missing Message	Communication stop occurs between the multiplex tilt and telescopic ECU and the front power seat switch LH (power seat control ECU) continuously for 10 seconds or more.	The power source voltage of the multiplex tilt and telescopic ECU is 9 V or more.	Wait at least approximately 10 seconds with the power source voltage of the multiplex tilt and telescopic ECU at 9 V or more.	-	-	DTC is stored until it is cleared using the Techstream.
B2624*	Vehicles Speed	All conditions are met: Communication stop occurs between the multiplex tilt and telescopic ECU and combination meter assembly continuously for 10 seconds or more. The auto operation condition is met.	All conditions are met: 1 second or more elapse after the ignition switch is ON. The power source voltage of the multiplex tilt and telescopic ECU is 10 V or more.	Turn the ignition switch to ON and wait at least approximately 11 seconds.	-	-	DTC is stored until it is cleared using the Techstream.

(f) Combination Meter Assembly / Techstream Display "Combination Meter"

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	Communication stop occurs between the combination meter assembly and ECM continuously for 2 seconds or more.	All conditions are met: The ignition switch is ON. The power source voltage of the combination meter assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 2 seconds.	MIL (Check engine warning light) illuminates.	-	DTC is stored until it is cleared using the Techstream.
U0129	Lost Communication with Brake System Control Module	Either of the following conditions is met: Communication stop occurs between the combination meter assembly and brake actuator assembly (skid control ECU) continuously for 2 seconds or more. Communication stop occurs between the combination meter assembly and brake actuator assembly (skid control ECU) continuously for 3 seconds or more.	All conditions are met: The ignition switch is ON. The power source voltage of the combination meter assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 3 seconds.	ABS warning light illuminates. VSC OFF indicator light illuminates. Brake warning light illuminates.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0142	Lost Communication with Body Control Module "B"	Either of the following conditions is met: Communication stop occurs between the combination meter assembly and main body ECU (multiplex network body ECU) continuously for 3 seconds or more. Communication stop occurs between the combination meter assembly and main body ECU (multiplex network body ECU) continuously for 10 seconds or more.	All conditions are met: The ignition switch is ON. The power source voltage of the combination meter assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 10 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0151	Lost Communication with Restraints Control Module	Communication stop occurs between the combination meter assembly and airbag sensor assembly continuously for 10 seconds or more.	All conditions are met: The ignition switch is ON. The power source voltage of the combination meter assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 10 seconds.	SRS warning light illuminates.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0163	Lost Communication With Navigation Control Module	Either of the following conditions is met: Communication stop occurs between the combination meter assembly and the radio and display receiver assembly continuously for 3 seconds or more. Communication stop occurs between the combination meter assembly and navigation receiver assembly continuously for 3 seconds or more.	All conditions are met: The ignition switch is ON. The power source voltage of the combination meter assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 3 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0235	Lost Communication with Front Radar Module	The combination meter assembly receive malfunction data from the millimeter wave radar sensor assembly continuously for 10 seconds or more.	All conditions are met: The ignition switch is ON. The power source voltage of the combination meter assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 10 seconds.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U023A	Lost Communication with Front Camera Module	Communication stop occurs between the combination meter assembly and forward recognition camera continuously for 10 seconds or more.	All conditions are met: The ignition switch is ON. The power source voltage of the combination meter assembly is 9.5 V or more.	Turn the ignition switch to ON and wait at least 10 seconds.	-	-	DTC is stored until it is cleared using the Techstream.

(g) Main Body ECU (Multiplex Network Body ECU) / Techstream Display "Main Body"

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication With ECM/PCM "A"	Communication stop occurs between the main body ECU (multiplex network body ECU) and ECM continuously for 10 seconds or more.	All conditions are met: 10 seconds or more elapse after the ignition switch is ON. The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0101	Lost Communication with TCM	Communication stop occurs between the main body ECU (multiplex network body ECU) and ECM continuously for 10 seconds or more.	All conditions are met: 10 seconds or more elapse after the ignition switch is ON. The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0151	Lost Communication with Restraints Control Module	Communication stop occurs between the main body ECU (multiplex network body ECU) and airbag sensor assembly continuously for 10 seconds or more.	All conditions are met: 10 seconds or more elapse after the ignition switch is ON. The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module	Communication stop occurs between the main body ECU (multiplex network body ECU) and combination meter assembly continuously for 10 seconds or more.	All conditions are met: 10 seconds or more elapse after the ignition switch is ON. The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0199	Lost Communication with "Door Control Module A"	Communication stop occurs between the main body ECU (multiplex network body ECU) and outer mirror control ECU assembly LH continuously for 10 seconds or more.	All conditions are met: 10 seconds or more elapse after the ignition switch is ON. The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0200	Lost Communication with "Door Control Module B"	Communication stop occurs between the main body ECU (multiplex network body ECU) and outer mirror control ECU assembly RH continuously for 10 seconds or more.	All conditions are met: 10 seconds or more elapse after the ignition switch is ON. The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0208	Lost Communication with "Seat Control Module A"	Communication stop occurs between the main body ECU (multiplex network body ECU) and front power seat switch LH continuously for 10 seconds or more.	All conditions are met: 10 seconds or more elapse after the ignition switch is ON. The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U023A	Lost Communication With Image Processing Module "A"	Communication stop occurs between the main body ECU (multiplex network body ECU) and forward recognition camera continuously for 5 seconds or more.	All conditions are met: 10 seconds or more elapse after the ignition switch is ON. The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.	Turn the ignition switch to ON and wait at least 15 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U1002	Lost Communication with Gateway Module (Main Body)	The main body ECU (multiplex network body ECU) detects a problem when communicating with the outer mirror control ECU assembly LH, outer mirror control ECU assembly RH, position control ECU assembly LH and the multiplex tilt and telescopic ECU.	All conditions are met: 10 seconds or more elapse after the ignition switch is ON. The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.	Turn the ignition switch to ON and wait at least approximately 10 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U1115	Communication with Tilt & Telescopic Module	Communication stop occurs between the main body ECU (multiplex network body ECU) and the multiplex tilt and telescopic ECU continuously for 10 seconds or more.	All conditions are met: 10 seconds or more elapse after the ignition switch is ON. The power source voltage of the main body ECU (multiplex network body ECU) is 10.5 V or more.	Turn the ignition switch to ON and wait at least 20 seconds.	-	-	DTC is stored until it is cleared using the Techstream.

(h) Air Conditioning Amplifier Assembly / Techstream Display "Air Conditioner"

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
B1499/99	Bus Off	Communication stop occurs between the air conditioning amplifier assembly and combination meter assembly or air conditioning amplifier assembly and ECM.	5 seconds or more elapse after the ignition switch is ON.	Turn the ignition switch to ON and wait at least 5 seconds.	-	-	DTC is stored until it is cleared using the Techstream.

(i) Blind Spot Monitor Sensor RH / Techstream Display "Blind Spot Monitor Master" (w/ Blind Spot Monitor System)

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	Communication stop occurs between the blind spot monitor sensor RH and ECM continuously for approximately 11 seconds or more.	All conditions are met: 1 second or more elapse after the ignition switch is ON. The power source voltage of the blind spot monitor sensor RH is 10 V or more. Blind spot monitor switch is on.	Turn the ignition switch to ON and wait at least approximately 12 seconds.	BSM indicator illuminates (umber)	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0125	Lost Communication with Yaw Rate Sensor Module	Communication stop occurs between the blind spot monitor sensor RH and airbag sensor assembly continuously for approximately 4 seconds or more.	All conditions are met: 1 second or more elapse after the ignition switch is ON. The power source voltage of the blind spot monitor sensor RH is 10 V or more. Blind spot monitor switch is on.	Turn the ignition switch to ON and wait at least approximately 5 seconds.	BSM indicator illuminates (umber)	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0126	Lost Communication with Steering Angle Sensor Module	Communication stop occurs between the blind spot monitor sensor RH and spiral with sensor cable sub-assembly (steering angle sensor) continuously for approximately 4 seconds or more.	All conditions are met: 1 second or more elapse after the ignition switch is ON. The power source voltage of the blind spot monitor sensor RH is 10 V or more. Blind spot monitor switch is on.	Turn the ignition switch to ON and wait at least approximately 5 seconds.	BSM indicator illuminates (umber)	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0129	Lost Communication with Brake System Control Module	Communication stop occurs between the blind spot monitor sensor RH and brake actuator assembly (skid control ECU) continuously for approximately 4 seconds or more.	All conditions are met: 2 seconds or more elapse after the ignition switch is ON. The power source voltage of the blind spot monitor sensor RH is 10 V or more. Blind spot monitor switch is on.	Turn the ignition switch to ON and wait at least approximately 6 seconds.	BSM indicator illuminates (umber)	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0142	Lost Communication with Body Control Module "B"	Communication stop occurs between the blind spot monitor sensor RH and main body ECU (multiplex network body ECU) continuously for approximately 11 seconds or more.	All conditions are met: 1 second or more elapse after the ignition switch is ON. The power source voltage of the blind spot monitor sensor RH is 10 V or more. Blind spot monitor switch is on.	Turn the ignition switch to ON and wait at least approximately 12 seconds.	BSM indicator illuminates (umber)	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.

(j) Outer Mirror Control ECU Assembly LH / Techstream Display "Mirror L" (w/ Seat Memory)

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC

Detection Item

DTC Detection Condition

DTC Detection Pre-condition

DTC Check Procedure

Warning Displayed

DTC Storage Method

Indication in Meter

Multi-information Display

U0142

Lost Communication With Body Control Module "B"

Either of the following conditions is met:

Communication stop occurs between the outer mirror control ECU assembly LH and main body ECU (multiplex network body ECU) continuously for approximately 3 seconds or more.
Communication stop occurs between the outer mirror control ECU assembly LH and main body ECU (multiplex network body ECU) continuously for 10 seconds or more.
Communication stop occurs between the outer mirror control ECU assembly LH and air conditioning amplifier assembly continuously for 10 seconds or more.

A power source mode change is detected (+B changes from off to on, ACC changes between on and off, or IG changes between on and off).

Turn the ignition switch to ON and wait at least 10 seconds.

DTC is stored until it is cleared using the Techstream.

(k) Outer Mirror Control ECU Assembly RH / Techstream Display "Mirror R" (w/ Seat Memory)

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC

Detection Item

DTC Detection Condition

DTC Detection Pre-condition

DTC Check Procedure

Warning Displayed

DTC Storage Method

Indication in Meter

Multi-information Display

U0142

Lost Communication With Body Control Module "B"

Either of the following conditions is met:

Communication stop occurs between the outer mirror control ECU assembly RH and main body ECU (multiplex network body ECU) continuously for approximately 3 seconds or more.
Communication stop occurs between the outer mirror control ECU assembly RH and main body ECU (multiplex network body ECU) continuously for 10 seconds or more.
Communication stop occurs between the outer mirror control ECU assembly RH and air conditioning amplifier assembly continuously for 10 seconds or more.

A power source mode change is detected (+B changes from off to on, ACC changes between on and off, or IG changes between on and off).

Turn the ignition switch to ON and wait at least 10 seconds.

DTC is stored until it is cleared using the Techstream.

(l) Tire Pressure Warning ECU and Receiver / Techstream Display "Tire Pressure Monitor"

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0129	Lost Communication with Brake System Control Module	Communication stop occurs between the tire pressure warning ECU and receiver and the brake actuator assembly (skid control ECU) continuously for 60 seconds or more.	3 seconds or more elapse after the ignition switch is ON.	Turn the ignition switch to ON and wait at least 63 seconds.	-	-	DTC remains stored only while malfunction is occurring.

(m) Millimeter Wave Radar Sensor Assembly (w/ Pre-collision System)

HINT:

This ECU uses the CAN communication system for DTC communication.

(1) Techstream Display "Radar Cruise2"

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
U0100	Lost Communication with ECM/PCM "A"	Communication stop occurs between the millimeter wave radar sensor assembly and ECM for approximately 1 second or more.	All conditions are met: 1 second or more elapse after the ignition switch is ON. The cruise control main switch is on. Vehicle speed is 36 km/h (22 mph) or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the cruise control main switch on and drive the vehicle at a speed of 36 km/h (22 mph) or more for approximately 2 seconds or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0125	Lost Communication with Yaw Rate Sensor Module	Communication stop occurs between the millimeter wave radar sensor assembly and airbag sensor assembly for approximately 1 second or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. The cruise control main switch is on. Vehicle speed is 36 km/h (22 mph) or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the cruise control main switch on and drive the vehicle at a speed of 36 km/h (22 mph) or more for approximately 4 seconds or more.	-	Displays messages on the multi-information display.	DTC remains stored only while malfunction is occurring.
U0126	Lost Communication with Steering Angle Sensor Module	Communication stop occurs between the millimeter wave radar sensor assembly and spiral with sensor cable sub-assembly (steering angle sensor) for approximately 6 seconds or more.	All conditions are met: 1 second or more elapse after the ignition switch is ON. The cruise control main switch is on. Vehicle speed is 36 km/h (22 mph) or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the cruise control main switch on and drive the vehicle at a speed of 36 km/h (22 mph) or more for approximately 7 seconds or more.	-	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0129	Lost Communication with Brake System Control Module	Communication stop occurs between the millimeter wave radar sensor assembly and brake actuator assembly (skid control ECU) for approximately 2 seconds or more.	All conditions are met: 2 seconds or more elapse after the ignition switch is ON. The cruise control main switch is on. Vehicle speed is 36 km/h (22 mph) or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the cruise control main switch on and drive the vehicle at a speed of 36 km/h (22 mph) or more for approximately 4 seconds or more.	-	Displays messages on the multi-information display.	DTC remains stored only while malfunction is occurring.

(2) Techstream Display "Pre-Collision 2"

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
*: Refer to Pre-collision System Click here
U0100	Lost Communication with ECM/PCM "A"	Communication stop occurs between the millimeter wave radar sensor assembly and ECM for approximately 4 seconds or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. Vehicle speed is 5 km/h (3 mph) or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Drive the vehicle at a speed of 5 km/h (3 mph) or more for approximately 7 seconds or more.	PCS OFF indicator light blinks.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0125	Lost Communication with Yaw Rate Sensor Module	Communication stop occurs between the millimeter wave radar sensor assembly and airbag sensor assembly for approximately 1 second or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. Vehicle speed is 5 km/h (3 mph) or more. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Drive the vehicle at a speed of 5 km/h (3 mph) or more for approximately 4 seconds or more.	PCS OFF indicator light blinks.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0126	Lost Communication with Steering Angle Sensor Module	Communication stop occurs between the millimeter wave radar sensor assembly and spiral with sensor cable sub-assembly (steering angle sensor) for approximately 4 second or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the ignition switch to ON and wait for at least approximately 7 seconds.	PCS OFF indicator light blinks.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0129	Lost Communication with Brake System Control Module	Communication stop occurs between the millimeter wave radar sensor assembly and brake actuator assembly (skid control ECU) for approximately 6 seconds or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the ignition switch to ON and wait for at least approximately 9 seconds.	PCS OFF indicator light blinks.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0137	Lost Communication with Trailer Brake Control Module	Communication stop occurs between the millimeter wave radar sensor assembly and brake control with bracket relay for approximately 2 seconds or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the ignition switch ON and wait for at least approximately 5 seconds.	PCS OFF indicator light blinks.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0235*	Lost Communication with Cruise Control Front Distance Range Sensor	The millimeter wave radar sensor assembly receives malfunction data from the brake actuator assembly (skid control ECU) for approximately 2 seconds or more.	All conditions are met: 2 seconds or more elapse after the ignition switch is ON. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the ignition switch to ON and wait for at least approximately 4 seconds.	PCS OFF indicator light blinks.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U023A*	Lost Communication with Image Processing Module "A"	Communication stop occurs between the millimeter wave radar sensor assembly and forward recognition camera for approximately 1 second or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the ignition switch to ON and wait for at least approximately 4 seconds.	PCS OFF indicator light blinks.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U1002*	Lost Communication with Gateway Module	Communication abnormal data between the millimeter wave radar sensor assembly and forward recognition camera assembly is continuously for approximately 1 second or more.	All conditions are met: Approximately 3 second or more elapse after turning the ignition switch is ON. The power source voltage of the millimeter wave radar sensor assembly is 10 V or more.	Turn the ignition switch to ON and wait for at least approximately 4 seconds.	PCS OFF indicator light blinks.	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.

(n) Forward Recognition Camera (w/ Pre-collision System)

HINT:

This ECU uses the CAN communication system for DTC communication.

(1) Techstream Display "Front Recognition Camera"

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
*: Refer to Forward Recognition Camera System Click here
U0100	Lost Communication with ECM/PCM "A"	Communication stop occurs between the forward recognition camera and ECM for approximately 5 seconds or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. Vehicle speed is 1 km/h (1 mph) or more. The power source voltage of the forward recognition camera is 10 V or more.	Drive the vehicle at a speed of 1 km/h (1 mph) or more for approximately 8 seconds or more.	-	-	DTC is stored until it is cleared using the Techstream.
U0101	Lost Communication with TCM	Communication stop occurs between the forward recognition camera and ECM for approximately 5 seconds or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. Vehicle speed is 1 km/h (1 mph) or more. The power source voltage of the forward recognition camera is 10 V or more.	Drive the vehicle at a speed of 1 km/h (1 mph) or more for approximately 8 seconds or more.	-	-	DTC is stored until it is cleared using the Techstream.
U0123	Lost Communication with Yaw Rate Sensor Module	Communication stop occurs between the forward recognition camera and airbag sensor assembly for 5 seconds or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. Vehicle speed is 1 km/h (1 mph) or more. The power source voltage of the forward recognition camera is 10 V or more.	Drive the vehicle at a speed of 1 km/h (1 mph) or more for 8 seconds or more.	-	-	DTC is stored until it is cleared using the Techstream.
U0126	Lost Communication with Steering Angle Sensor Module	Communication stop occurs between the forward recognition camera and spiral with sensor cable sub-assembly (steering angle sensor) for 5 seconds or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. The power source voltage of the forward recognition camera is 10 V or more.	Turn the ignition switch to ON and wait for at least 8 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0129	Lost Communication with Brake System Control Module	Communication stop occurs between the forward recognition camera and brake actuator assembly (skid control ECU) for 5 seconds or more.	Both conditions are met: 3 seconds or more elapse after the ignition switch is ON. The power source voltage of the forward recognition camera is 10 V or more.	Turn the ignition switch to ON and wait for at least 8 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0142	Lost Communication with Body Control Module "B"	Communication stop occurs between the forward recognition camera and main body ECU (multiplex network body ECU) for 5 seconds or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. The power source voltage of the forward recognition camera is 10 V or more.	Turn the ignition switch to ON and wait for at least 8 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module	Communication stop occurs between the forward recognition camera and combination meter assembly for 50 seconds or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. The power source voltage of the forward recognition camera is 10 V or more.	Turn the ignition switch to ON and wait for at least 53 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0235*	Lost Communication with Cruise Control Front Distance Range Sensor	Communication stop occurs between the forward recognition camera and millimeter wave radar sensor assembly for approximately 5 seconds or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. The power source voltage of the forward recognition camera is 10 V or more.	Turn the ignition switch to ON and wait for at least approximately 8 seconds.	-	-	DTC is stored until it is cleared using the Techstream.

(2) Techstream Display "LKA/LDA"

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
*: Refer to Lane Departure Alert System Click here
U0123	Lost Communication with Yaw Rate Sensor Module	Communication stop occurs between the forward recognition camera and airbag sensor assembly for 5 seconds or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. Vehicle speed is 5 km/h (3 mph) or more. The power source voltage of the forward recognition camera is 10 V or more. LDA main switch is ON.	Drive the vehicle at a speed of 5 km/h (3 mph) or more for 8 seconds or more.	The LDA indicator illuminates (Yellow).	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0126	Lost Communication with Steering Angle Sensor Module	Communication stop occurs between the forward recognition camera and spiral with sensor cable sub-assembly (steering angle sensor) for 5 seconds or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. The power source voltage of the forward recognition camera is 10 V or more. LDA main switch is ON.	Turn the ignition switch to ON and wait for at least 8 seconds.	The LDA indicator illuminates (Yellow).	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0129	Lost Communication with Brake System Control Module	Communication stop occurs between the forward recognition camera and brake actuator assembly (skid control ECU) for 5 seconds or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. The power source voltage of the forward recognition camera is 10 V or more. LDA main switch is ON.	Turn the ignition switch to ON and wait for at least 8 seconds.	The LDA indicator illuminates (Yellow).	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0142	Lost Communication with Body Control Module "B"	Communication stop occurs between the forward recognition camera and main body ECU (multiplex network body ECU) for 5 seconds or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. The power source voltage of the forward recognition camera is 10 V or more. LDA main switch is ON.	Turn the ignition switch to ON and wait for at least 8 seconds.	The LDA indicator illuminates (Yellow).	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module	Communication stop occurs between the forward recognition camera and combination meter assembly for 50 seconds or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. The power source voltage of the forward recognition camera is 10 V or more. LDA main switch is ON.	Turn the ignition switch to ON and wait for at least 53 seconds.	The LDA indicator illuminates (Yellow).	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.
U0235*	Lost Communication with Cruise Control Front Distance Range Sensor	Communication stop occurs between the forward recognition camera and millimeter wave radar sensor assembly for 5 seconds or more.	All conditions are met: 3 seconds or more elapse after the ignition switch is ON. The power source voltage of the forward recognition camera is 10 V or more. Vehicle speed is 5km/h (3mph) or more. LDA main switch is ON.	Turn the ignition switch to ON and wait for at least approximately 8 seconds.	The LDA indicator illuminates (Yellow).	Displays messages on the multi-information display.	DTC is stored until it is cleared using the Techstream.

(o) Radio and Display Receiver Assembly / Techstream Display "Navigation System" (w/ Audio and Visual System)

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
ECB*: Electronically Controlled Brake System
U0073	Sending Malfunction (Navigation to APGS)	Either of the following conditions is met: Bus off is detected CAN bus is not connected	Ignition switch is ON	Turn the ignition switch to ON and wait for at least 4 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0100	Engine ECU Communication	Communication stop occurs between the radio and display receiver assembly and ECM for 4 seconds or more.	Ignition switch is ON	Turn the ignition switch to ON and wait for at least 4 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0129	VSC(ECB*)ECU Communication	Communication stop occurs between the radio and display receiver assembly and the brake actuator assembly (skid control ECU) for 1 second or more.	Ignition switch is ON	Turn the ignition switch to ON and wait for at least 1 second.	-	-	DTC is stored until it is cleared using the Techstream.
U0140	Lost Communication with Body Control Module	Communication stop occurs between the radio and display receiver assembly and the main body ECU (multiplex network body ECU) for 10 seconds or more.	Ignition switch is ON	Turn the ignition switch to ON and wait for at least 10 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0155	Meter ECU Communication	Communication stop occurs between the radio and display receiver assembly and the combination meter assembly for 30 seconds or more.	Ignition switch is ON	Turn the ignition switch to ON and wait for at least 30 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0164	Air Conditioner ECU Communication	Either of the following conditions is met: Communication stop occurs between the radio and display receiver assembly and the air conditioning amplifier assembly for 3 seconds or more. Communication stop occurs between the radio and display receiver assembly and the air conditioning amplifier assembly for 10 seconds or more. Communication stop occurs between the radio and display receiver assembly and the air conditioning amplifier assembly for 15 seconds or more.	Ignition switch is ON	Turn the ignition switch to ON and wait for at least 15 seconds.	-	-	DTC is stored until it is cleared using the Techstream.

(p) Navigation Receiver Assembly / Techstream Display "Navigation System" (w/ Navigation System)

HINT:

This ECU uses the CAN communication system for DTC communication.

DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Warning Displayed		DTC Storage Method
DTC	Detection Item	DTC Detection Condition	DTC Detection Pre-condition	DTC Check Procedure	Indication in Meter	Multi-information Display	DTC Storage Method
ECB*: Electronically Controlled Brake System
U0073	Sending Malfunction (Navigation to APGS)	Either of the following conditions is met: Bus off is detected CAN bus is not connected	Ignition switch is ON	Turn the ignition switch to ON and wait for at least 10 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0100	Engine ECU Communication	Communication stop occurs between the navigation receiver assembly and ECM for 4 seconds or more.	Ignition switch is ON	Turn the ignition switch to ON and wait for at least 4 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0129	VSC(ECB*)ECU Communication	Communication stop occurs between the navigation receiver assembly and brake actuator assembly (skid control ECU) for 1 second or more.	Ignition switch is ON	Turn the ignition switch to ON and wait for at least 1 second.	-	-	DTC is stored until it is cleared using the Techstream.
U0140	Lost Communication with Body Control Module	Communication stop occurs between the navigation receiver assembly and main body ECU (multiplex network body ECU) for 10 seconds or more.	Ignition switch is ON	Turn the ignition switch to ON and wait for at least 10 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0155	Meter ECU Communication	Communication stop occurs between the navigation receiver assembly and combination meter assembly for 30 seconds or more.	Ignition switch is ON	Turn the ignition switch to ON and wait for at least 30 seconds.	-	-	DTC is stored until it is cleared using the Techstream.
U0164	Air Conditioner ECU Communication	Either of the following conditions is met: Communication stop occurs between the navigation receiver assembly and air conditioning amplifier assembly for 3 seconds or more. Communication stop occurs between the navigation receiver assembly and air conditioning amplifier assembly for 10 seconds or more. Communication stop occurs between the navigation receiver assembly and air conditioning amplifier assembly for 15 seconds or more.	Ignition switch is ON	Turn the ignition switch to ON and wait for at least 15 seconds.	-	-	DTC is stored until it is cleared using the Techstream.

(q) Airbag Sensor Assembly / Techstream Display "SRS Airbag"

HINT:

The airbag sensor assembly is connected to the CAN communication system, but the airbag sensor assembly does not store or output CAN communication DTCs.

(r) Front Power Seat Switch LH (Power Seat Control ECU) / Techstream Display "Driver Seat" (w/ Seat Memory)

HINT:

The front power seat switch LH (power seat control ECU) is connected to the CAN communication system, but the position control ECU assembly LH does not store or output CAN communication DTCs.

(s) Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor) / Techstream Display "-"

HINT:

The spiral with sensor cable sub-assembly (steering angle sensor) is connected to the CAN communication system, but the spiral with sensor cable sub-assembly (steering angle sensor) does not store or output CAN communication DTCs.

(t) Central Gateway ECU (Network Gateway ECU) / Techstream Display "Central Gateway"

HINT:

The central gateway ECU (network gateway ECU) is connected to the CAN communication system, but the central gateway ECU (network gateway ECU) does not store or output CAN communication DTCs.

CAN BUS WAVEFORMS

HINT:

The following waveforms are measured between terminals CANH and GND, and terminals CANL and GND of the central gateway ECU (network gateway ECU). (Use this as a reference for diagnosis of CAN communication lines.)
When malfunctions in multiple ECUs are suspected based on the CAN bus check and DTCs checked using the Techstream, check the resistance of the CAN bus using an ohmmeter first. If no problems are found, check the following waveforms.
Click here
If a waveform is not similar to one of the following 3 patterns (Group 1), then an open in a CAN main bus line, an open in a CAN branch line, or a short between a CAN line (CANH or CANL) and ground is suspected (Group 2).
Wiggle the connector and wire harness to check if the waveform changes.

(a) CAN bus waveforms (Group 1)

(1) Normal waveform

(2) Open in both of the lines (CANH and CANL) of a CAN branch

HINT:

Waveforms (waveforms shown using dotted lines) are not present from an ECU or sensor connected to a CAN branch with an open circuit in both lines. (Waveforms from other ECUs or sensors are normal.)
Because this waveform is similar to a normal waveform, instead of using the waveform, the malfunctioning part can be narrowed down by performing a CAN bus check.

(3) Short between the CAN bus lines (CANH and CANL)

HINT:

Waveforms disappear.
If the malfunction is in an ECU, disconnecting the ECU will change the waveform. If the waveform does not change, a malfunction in the wire harness is suspected.

(b) CAN bus waveforms (reference) (Group 2)

NOTICE:

The following CAN bus waveforms can be used only as reference. The actual measured waveform may differ significantly depending on the location of the open or short circuit.

(1) Open in a CAN branch line (CANH)

HINT:

An abnormal waveform is output from an ECU with an open in one of its CAN branch lines. Because this abnormal output interferes with the signals from other ECUs, the output of other ECUs will also appear abnormal.
Narrow down the malfunctioning part by checking DTCs or performing a CAN bus check, or by checking waveform changes when ECUs or sensors are disconnected. The waveform will change to one for an open in both sides of a CAN branch when the ECU or sensor with an open CAN branch line is disconnected.

(2) Open in a CAN branch line (CANL)

HINT:

An abnormal waveform is output from an ECU with an open in one of its CAN branch lines. Because this abnormal output interferes with the signals from other ECUs, the output of other ECUs will also appear abnormal.
Narrow down the malfunctioning part by checking DTCs or performing a CAN bus check, or by checking waveform changes when ECUs or sensors are disconnected. The waveform will change to one for an open in both sides of a CAN branch when the ECU or sensor with an open CAN branch line is disconnected.

(3) Open in a CAN main bus line (CANH)

HINT:

Waveforms of ECUs or sensors that are closer to the central gateway ECU (network gateway ECU) than the open part are almost normal.
Waveforms of ECUs or sensors that are on the opposite side of the central gateway ECU (network gateway ECU) from the open part are abnormal.
An open in a CAN main bus line can be confirmed by measuring the resistance between the CANH and CANL terminals of any CAN branch.

(4) Short between a CAN bus line (CANH) and ground

HINT:

Narrow down the shorted part by checking for waveform changes when disconnecting connectors from the CAN junction connectors or when disconnecting ECUs or sensors.
A short to ground in the CANH line can be confirmed by measuring the resistance between CANH and ground using an ohmmeter.

(5) Short between a CAN bus line (CANL) and ground

HINT:

Narrow down the shorted part by checking for waveform changes when disconnecting connectors from the CAN junction connectors or when disconnecting ECUs or sensors.
A short to ground in the CANL line can be confirmed by measuring the resistance between CANL and ground using an ohmmeter.

DATA SENDING/RECEIVING TABLE

(a) Data sending/receiving table

HINT:

If Data List items related to sent/received data are not displayed properly, the part for which communication is interrupted can be determined using the table below.

Data content	Data Detected and Sent by	Relevant Data List Item		Relevant Data List Item
Data content	Data Detected and Sent by	Can be Checked in Data List	Cannot be Checked in Data List	Selected System*3	Data List Items
Engine speed	ECM	Combination meter assembly Brake actuator assembly (skid control ECU)	Air conditioning amplifier assembly Main body ECU (multiplex network body ECU) 4 wheel drive control ECU (4WD control ECU) Radio and display receiver assembly Navigation receiver assembly	Engine and ECT	Engine Speed
				Combination Meter	Engine Rpm
				ABS/VSC/TRAC	Engine Revolutions
Engine coolant temperature	ECM	Air conditioning amplifier assembly Combination meter assembly	4 wheel drive control ECU (4WD control ECU)	Engine and ECT	Engine coolant temperature
				Air Conditioner	Engine Coolant Temp
				Combination Meter	Coolant Temperature
Shift position	ECM	Main body ECU (multiplex network body ECU) Radio and display receiver assembly Navigation receiver assembly Front power seat switch LH (power seat control ECU) Blind spot monitor sensor RH Brake actuator assembly (skid control ECU)	Combination meter assembly*1 4 wheel drive control ECU (4WD control ECU) Tire pressure warning ECU and receiver Forward recognition camera Millimeter wave radar sensor assembly brake control with bracket relay	Engine and ECT	Shift SW Status (P Range) Shift SW Status (R Range) Shift SW Status (N Range) Shift SW Status (D Range)
				Main Body	Shift P signal
				ABS/VSC/TRAC	Shift Lever Position
				Navigation System	Reverse Signal
				Driver Seat	P Switch
				Blind Spot Monitor Master	Reverse
Stop light switch signal	ECM	-	Radio and display receiver assembly Navigation receiver assembly Blind spot monitor sensor RH 4 wheel drive control ECU (4WD control ECU)	Engine and ECT	Stop Light Switch
Wheel speed	Brake actuator assembly (skid control ECU)	-	ECM Blind spot monitor sensor RH Forward recognition camera Millimeter wave radar sensor assembly 4 wheel drive control ECU (4WD control ECU)	ABS/VSC/TRAC	FR Wheel Speed FL Wheel Speed RR Wheel Speed RL Wheel Speed
Vehicle speed	Brake actuator assembly (skid control ECU)	ECM Combination meter assembly*2 Radio and display receiver assembly Navigation receiver assembly Blind spot monitor sensor RH Millimeter wave radar sensor assembly Brake control with bracket relay	Forward recognition camera 4 wheel drive control ECU (4WD control ECU)	ABS/VSC/TRAC	Vehicle Speed
				Engine and ECT	Vehicle Speed
				Radar Cruise1	Cruise Vehicle Speed
				Combination Meter	Vehicle Speed Meter
				Navigation System	Vehicle Speed
				Blind Spot Monitor Master	Vehicle Speed
				Radar Cruise2	Vhcl Spd-Brake ECU
				Trailer Brake Controller	Vehicle Speed
	Combination meter assembly*2	Multiplex tilt and telescopic ECU	Air conditioning amplifier assembly Main body ECU (multiplex network body ECU) Brake actuator assembly (skid control ECU)	Combination Meter	Vehicle Speed Meter
	Combination meter assembly*2	Multiplex tilt and telescopic ECU		Tilt&Telescopic	Freeze Speed Info
Ambient temperature	Air conditioning amplifier assembly	ECM Combination meter assembly	Radio and display receiver assembly Navigation receiver assembly Forward recognition camera Brake actuator assembly (skid control ECU) 4 wheel drive control ECU (4WD control ECU)	Air Conditioner	Ambient Temp Sensor
				Engine and ECT	Ambient Temp for A/C
				Combination Meter	Ambient Temperature
Steering angle signal	spiral with sensor cable sub-assembly (steering angle sensor)	Brake actuator assembly (skid control ECU) Blind spot monitor sensor RH Millimeter wave radar sensor assembly	Radio and display receiver assembly Navigation receiver assembly Forward recognition camera	ABS/VSC/TRAC	Steering Angle Value spiral with sensor cable sub-assembly (steering angle sensor)
				Blind Spot Monitor Master	Steering Angle
				Radar Cruise2	Steering Angle
Door courtesy	Main body ECU (multiplex network body ECU)	-	Radio and display receiver assembly Navigation receiver assembly Forward recognition camera	Main Body	D Door Courtesy SW P Door Courtesy SW FR Door Courtesy SW FL Door Courtesy SW

*1: Although the received contents cannot be checked in the Data List, whether or not the data is received normally can be checked by observing the combination meter assembly.
*2: The combination meter assembly receives a vehicle speed signal from the brake actuator assembly (skid control ECU) and sends the signal to other ECUs.
*3: According to the display on the Techstream, read the Data List.
- Enter the following menus: Powertrain / Engine and ECT / Data List.
  1UR-FE: Click here
  
  3UR-FE: Click here
  
  3UR-FBE: Click here
- Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
  Click here
- Enter the following menus: Body Electrical / Combination Meter / Data List.
  Click here
- Enter the following menus: Body Electrical / Air Conditioner / Data List.
  Click here
- Enter the following menus: Body Electrical / Driver Seat / Data List.
  Click here
- Enter the following menus: Body Electrical / Main Body / Data List.
  Click here
- Enter the following menus: Chassis / Trailer Brake Controller / Data List.
  Click here
- Enter the following menus: Body Electrical / Tilt & Telescopic / Data List.
  Click here
- Enter the following menus: Powertrain / Radar Cruise2 / Data List.
  Click here
- Enter the following menus: Body Electrical / Navigation System / Data List.
  Click here
  
  Click here
- Enter the following menus: Body Electrical / Blind Spot Monitor Master / Data List.
  Click here
- Enter the following menus: Powertrain / Radar Cruise1 / Data List.
  Click here

Data List / Active Test

Diagnostic Trouble Code Chart

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Toyota Tundra Service Manual: Diagnosis System

Data List / Active Test

Diagnostic Trouble Code Chart

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