Toyota Tundra Service Manual: Lost Communication With Vehicle Dynamics Control Module (U0122)

DESCRIPTION

The ECM receives signals from the skid control ECU (brake actuator assembly) via CAN communication.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
U0122	Lost Communication with Vehicle Dynamics Control Module	While the vehicle speed is 40 km/h (25 mph) or more and the cruise control main switch (ON-OFF button) is on, signals cannot be received from the skid control ECU (brake actuator assembly) for 2.65 seconds or more.	CAN communication system ECM Skid control ECU (brake actuator assembly)

CAUTION / NOTICE / HINT

HINT:

Refer to troubleshooting in CAN Communication System.

Click here

PROCEDURE

1.	CHECK FOR DTCs (CRUISE CONTROL SYSTEM)

(a) Clear the DTCs.

Click here

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

HINT:

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

Drive the vehicle at a speed for which cruise control operation is possible.
Turn the cruise control system on using the cruise control main switch (ON-OFF button).
Push the cruise control main switch to -SET to begin control of vehicle speed using the cruise control system.

Click here

Result	Proceed to
DTC U0122 is not output	A
DTC U0122 is output	B

USE SIMULATION METHOD TO CHECK

GO TO CAN COMMUNICATION SYSTEM

Toyota Tundra Service Manual > Vehicle Stability Control System: Brake Pedal Load Sensing Switch OFF Stuck Malfunction (C1430,C1431)
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Toyota Tundra Owners Manual