VARIABLE GEAR RATIO STEERING SYSTEM, Diagnostic DTC:U0100, U0101, U0125, U0126, U0129, U0131, U0134, U1103

DTC Code DTC Name
U0100 Lost Communication with ECM / PCM "A"
U0101 Lost Communication with TCM
U0125 Lost Communication with Yaw Rate Sensor Module
U0126 Lost Communication with Steering Angle Sensor Module
U0129 Lost Communication with Brake System Control Module
U0131 Lost Communication with Power Steering Control Module
U0134 Lost Communication with DRS Module
U1103 Lost Communication with Stop and Start Control Module

DESCRIPTION

The VGRS ECU (front steering control ECU) receives signals from the ECM, skid control ECU (brake actuator assembly), yaw rate sensor, steering sensor, engine stop and start ECU*, rack and pinion power steering gear assembly and DRS ECU (rear steering control ECU) 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 Lost Communication with ECM / PCM "A"

All conditions are met:


  • 1 second or more elapse after turning the engine switch on (IG).

  • Before control starts.

  • Power source voltage at 10 to 16 V.

  • The signal from the ECM is lost for approximately 3 seconds or more.

  • ECM

  • CAN communication system

 Comes on

  • The system recovers from the communication stop

  • Turn the engine switch on (IG) again
U0101 Lost Communication with TCM

All conditions are met:


  • 1 second or more elapse after turning the engine switch on (IG).

  • Power source voltage at 10 to 16 V.

  • The signal from the ECM is lost for approximately 12 seconds or more.

  • ECM

  • CAN communication system

 Comes on

  • The system recovers from the communication stop

  • Turn the engine switch on (IG) again
U0125 Lost Communication with Yaw Rate Sensor Module

All conditions are met:


  • 1 second or more elapse after turning the engine switch on (IG).

  • Power source voltage at 10 to 16 V.

  • The signal from the yaw rate sensor is lost for approximately 12 seconds or more.

  • Yaw rate sensor

  • CAN communication system

 Comes on

  • The system recovers from the communication stop

  • Turn the engine switch on (IG) again
U0126 Lost Communication with Steering Angle Sensor Module

All conditions are met:


  • 1 second or more elapse after turning the engine switch on (IG).

  • Power source voltage at 10 to 16 V.

  • The signal from the steering sensor is lost for approximately 3 seconds or more.

  • Steering sensor

  • CAN communication system

 Comes on

  • The system recovers from the communication stop

  • Turn the engine switch on (IG) again
U0129 Lost Communication with Brake System Control Module

All conditions are met:


  • 2 seconds or more elapse after turning the engine switch on (IG).

  • Power source voltage at 10 to 16 V.

  • The signal from the skid control ECU (brake actuator assembly) is lost for approximately 3 seconds or more.

  • Skid control ECU (brake actuator assembly)

  • CAN communication system

 Comes on

  • The system recovers from the communication stop

  • Turn the engine switch on (IG) again
U0131 Lost Communication with Power Steering Control Module

All conditions are met:


  • 1 second or more elapse after turning the engine switch on (IG).

  • Power source voltage at 10 to 16 V.

  • The signal from the rack and pinion power steering gear assembly is lost for approximately 3 seconds or more.

  • Rack and pinion power steering gear assembly

  • CAN communication system

 Comes on

  • The system recovers from the communication stop

  • Turn the engine switch on (IG) again
U0134 Lost Communication with DRS Module

All conditions are met:


  • 1 second or more elapse after turning the engine switch on (IG).

  • Power source voltage at 10 to 16 V.

  • The signal from the DRS ECU (rear steering control ECU) is lost for approximately 3 seconds or more.

  • DRS ECU (rear steering control ECU)

  • CAN communication system

 Comes on

  • The system recovers from the communication stop

  • Turn the engine switch on (IG) again
U1103 Lost Communication with Stop and Start Control Module

All conditions are met:


  • 1 second or more elapse after turning the engine switch on (IG).

  • Power source voltage at 10 to 16 V.

  • The signal from the engine stop and start ECU is lost for approximately 3 seconds or more.

  • Engine stop and start ECU

  • CAN communication system

 Comes on

  • The system recovers from the communication stop

  • Turn the 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 U0100, U0101, U0125, U0126, U0129, U0131, U0134 and U1103 are not output A
      DTC U0100, U0101, U0125, U0126, U0129, U0131, U0134 or U1103 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

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