POWER STEERING SYSTEM, Diagnostic DTC:U0100, U0129

DTC Code DTC Name
U0100 Lost Communication with ECM / PCM "A"
U0129 Lost Communication with Brake System Control Module

DESCRIPTION

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

DTC No. DTC Detection Condition Trouble Area
U0100 ECM communication error

  • CAN communication system

  • ECM

  • Network gateway ECU*
U0129 Skid control ECU communication error

  • CAN communication system

  • Brake actuator assembly (Skid control ECU)

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication system DTC is output.


      Result
      Result Proceed to
      CAN communication system DTC is not output A
      CAN communication system DTC is output (w/o Toyota Safety Sense) B
      CAN communication system DTC is output (w/ Toyota Safety Sense) C

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here