VARIABLE GEAR RATIO STEERING SYSTEM, Diagnostic DTC:U0100/56, U0101/56, U0125/56, U0126/56, U0129/56, U0131/56

DTC Code DTC Name
U0100/56 Lost Communication with ECM / PCM "A"
U0101/56 Lost Communication with TCM
U0125/56 Lost Communication with Yaw Rate Sensor Module
U0126/56 Lost Communication with Steering Angle Sensor Module
U0129/56 Lost Communication with Brake System Control Module
U0131/56 Lost Communication with Power Steering Control Module

DESCRIPTION

The VGRS ECU (front steering control ECU) receives signals from the ECM, TCM, skid control ECU (brake actuator assembly), yaw rate sensor, steering sensor and power steering ECU assembly via CAN communication. When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system first.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition
U0100/56 Lost Communication with ECM / PCM "A"

Both conditions are met for approximately 3 seconds or more:


  • The engine switch is on (IG).

  • The signal from the ECM is lost.

  • ECM

  • CAN communication system

 Comes on Engine switch on (IG) again
U0101/56 Lost Communication with TCM

Both conditions are met for approximately 12 seconds or more:


  • The engine switch is on (IG).

  • The signal from the TCM is lost.

  • TCM

  • CAN communication system

 Comes on Engine switch on (IG) again
U0125/56 Lost Communication with Yaw Rate Sensor Module

Both conditions are met for approximately 12 seconds or more:


  • The engine switch is on (IG).

  • The signal from the yaw rate sensor is lost.

  • Yaw rate sensor

  • CAN communication system

 Comes on Engine switch on (IG) again
U0126/56 Lost Communication with Steering Angle Sensor Module

Both conditions are met for approximately 3 seconds or more:


  • The engine switch is on (IG).

  • The signal from the steering sensor is lost.

  • Steering sensor

  • CAN communication system

 Comes on Engine switch on (IG) again
U0129/56 Lost Communication with Brake System Control Module

Both conditions are met for approximately 3 seconds or more:


  • The engine switch is on (IG).

  • The signal from the skid control ECU (brake actuator assembly) is lost.

  • Skid control ECU (Brake actuator assembly)

  • CAN communication system

 Comes on Engine switch on (IG) again
U0131/56 Lost Communication with Power Steering Control Module

Both conditions are met for approximately 3 seconds or more:


  • The engine switch is on (IG).

  • The signal from the power steering ECU assembly is lost.

  • Power steering ECU assembly

  • CAN communication system

 Comes on Engine switch on (IG) again

PROCEDURE


  1. CHECK DTC


    1. Clear the DTCs.

      Click here


      Chassis > VGRS > Clear DTCs

    2. Check for DTCs.

      Click here


      Chassis > VGRS > Trouble Codes
      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

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