POWER STEERING SYSTEM, Diagnostic DTC:U0073, U0100, U0129

DTC Code DTC Name
U0073 Control Module Communication Bus OFF
U0100 Lost Communication with ECM / PCM "A"
U0129 Lost Communication with Brake System Control Module

DESCRIPTION

The power steering ECU receives signals from the ECM and the skid control ECU via the CAN communication system.

DTC No. DTC Detection Condition Trouble Area
U0073 Control module communication bus off CAN communication system
U0100 Lost communication with ECM/PCM "A"

  • CAN communication system

  • ECM
U0129 Lost communication with brake system control module

  • CAN communication system

  • Skid control ECU

Tech Tips


  • When 2 or more DTCs starting with [U] are output simultaneously, inspect the connectors and wire harness of each ECU.

  • If DTC U0100 is output, first erase the DTCs. Then turn the ignition switch from off to on (IG). If DTC U0100 is not output again, there is no malfunction.

WIRING DIAGRAM

A017CH7E01
A017DWZE01

INSPECTION PROCEDURE

PROCEDURE


  1. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC is not output.

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

    CHECK INTERMITTENT PROBLEMS