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

Toyota Tundra Service Manual / Engine, Hybrid System / Cruise Control / Cruise Control System / 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.

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

(c) Check for DTCs.

Click here

Result

Proceed to

DTC U0122 is not output

A

DTC U0122 is output

B
A

USE SIMULATION METHOD TO CHECK

B

GO TO CAN COMMUNICATION SYSTEM

    Terminals Of Ecu

    Vehicle Control History

    See More:

    Toyota Tundra Service Manual > Wiper And Washer System: System Description
    SYSTEM DESCRIPTION 1. WINDSHIELD WASHER OPERATION (a) When the front washer switch is turned on for approximately 0.3 seconds or more, this system operates the front wipers at a low speed immediately after the washer fluid is sprayed. If the switch is turned off within 1.5 seconds, the system stops ...

    Toyota Tundra Owners Manual

    Toyota Tundra Service Manual

    © 2026 Copyright www.ttundra.com
    0.0104