Toyota Tundra Service Manual: Lost Communication With Image Processing Module "A" (U023A)

Toyota Tundra Service Manual / Vehicle Interior / Pre-collision / Pre-collision System / Lost Communication With Image Processing Module "A" (U023A)

DESCRIPTION

The millimeter wave radar sensor assembly communicates with the forward recognition camera via CAN communication. If there is a communication error with the forward recognition camera, the millimeter wave radar sensor assembly stores DTC U023A.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U023A

Lost Communication With Image Processing Module "A"

When the ignition switch is ON, a communication error between the forward recognition camera and millimeter wave radar sensor assembly is detected for approximately 1 second.

  • CAN communication system
  • Forward recognition camera power source circuit
  • Forward recognition camera
  • Wire harness or connector
  • Millimeter wave radar wire

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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  • When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
  • If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera adjustment.

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HINT:

  • Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
  • When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (CAN BUS CHECK)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: System Select / Can Bus Check.

Result

Proceed to

All of the ECUs and sensors that are currently connected to the CAN communication system are displayed

A

None of the ECUs and sensors that are currently connected to the CAN communication system are displayed, or some of them are not displayed

B

B

GO TO CAN COMMUNICATION SYSTEM

A

2.

CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

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(b) Make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

(c) Check for DTCs.

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Result

Proceed to

DTC U1002 is not output

A

DTC U1002 is output

B

B

GO TO DTC CHART (U1002)

A

3.

CHECK FOR OPEN IN CAN BUS LINES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - FORWARD RECOGNITION CAMERA)

(a) Disconnect the W9 forward recognition camera connector.

(b) Disconnect the d1 millimeter wave radar sensor assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

W9-6 (CANH) - d1-5 (CA1P)

Cable disconnected from negative (-) battery terminal

Below 1 Ω

W9-12 (CANL) - d1-6 (CA1N)

Cable disconnected from negative (-) battery terminal

Below 1 Ω

(d) Connect the d1 millimeter wave radar sensor assembly connector.

(e) Connect the W9 forward recognition camera connector.

NG

GO TO STEP 5

OK

4.

CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE)

(a) Disconnect the W9 forward recognition camera connector.

*a

Front view of wire harness connector

(to Forward Recognition Camera)

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

W9-10 (GND) - Body ground

Always

Below 1 Ω

(c) Connect the cable to the negative (-) battery terminal.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

W9-7 (IGB) - Body ground

Ignition switch ON

11 to 14 V

(e) Connect the W9 forward recognition camera connector.

OK

REPLACE FORWARD RECOGNITION CAMERA

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

5.

CHECK FOR OPEN IN CAN BUS LINES (MILLIMETER WAVE RADAR WIRE - FORWARD RECOGNITION CAMERA)

(a) Disconnect the W9 forward recognition camera connector.

(b) Disconnect the Ad1 millimeter wave radar wire connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

W9-6 (CANH) - Ad1-5

Cable disconnected from negative (-) battery terminal

Below 1 Ω

W9-12 (CANL) - Ad1-6

Cable disconnected from negative (-) battery terminal

Below 1 Ω

(d) Connect the Ad1 millimeter wave radar wire connector.

(e) Connect the W9 forward recognition camera connector.

OK

REPAIR MILLIMETER WAVE RADAR WIRE

NG

REPAIR OR REPLACE CAN BUS LINE OR CONNECTOR (MILLIMETER WAVE RADAR WIRE - FORWARD RECOGNITION CAMERA)

    Terminals Of Ecu

    Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129,U0137)

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