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Home >> Lexus >> 2006 >> GS 300 RWD >> Repair and Diagnosis >> Brakes >> Brakes Control Systems >> Brake Control >> Vehicle Stability Control System >> DTC U0073/94 Control Module Communication Bus OFF; DTC U0100/65 Lost Communication with ECM / PCM; DTC U0123/62 Lost Communication with Yaw Rate Sensor Module; DTC U0124/95 Lost Communication with Lateral Acceleration Sensor Module; DTC U0126/63 Lost Communication with Steering Angle Sensor Module >> Wiring Diagram
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DTC U0073/94 Control Module Communication Bus OFF; DTC U0100/65 Lost Communication with ECM / PCM; DTC U0123/62 Lost Communication with Yaw Rate Sensor Module; DTC U0124/95 Lost Communication with Lateral Acceleration Sensor Module; DTC U0126/63 Lost Communication with Steering Angle Sensor Module: Wiring Diagram

Fig 1: Wiring Diagram
G04025020Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION) 
    1. Using the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to a DTC (See HOW TO PROCEED WITH TROUBLESHOOTING  ).

      DATA LIST: ABS/VSC 

      DATA LIST - ABS/VSC

      Item (Display) Measurement Item / Range (Display) Normal Condition
      EFI COM OPN EFI communication open detection / ERROR or NORMAL ERROR: Momentary interruption
      NORMAL: Normal
      STEERING OPN Steering sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
      NORMAL: Normal
      YAW RATE OPN Yaw rate sensor open detection / ERROR or NORMAL ERROR: Momentary interruption
      NORMAL: Normal

      OK: 

      There are no momentary interruptions. 

      HINT:

      Perform the above inspection before removing the sensor and connector.

      NG : Go to step   3 

      OK : Go to next step 

  2. RECONFIRM DTC 
    1. Record the output DTCs (for ABS, VSC, and CAN communication) (See DTC CHECK / CLEAR  for ABS and VSC, DIAGNOSIS SYSTEM ).

      HINT:

      If the CAN communication system DTC and the relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for ABS and VSC) after the CAN communication system returns to normal.

      Result 

      RESULT REFERENCE

      Display (DTC Output) Proceed To
      DTC is not output A
      DTC is output B (See FAIL-SAFE CHART  for ABS and VSC, CA-1 for CAN)

      B : REPAIR CIRCUIT INDICATED BY OUTPUT CODE 

      A : REPAIR CAN COMMUNICATION SYSTEM 

  3. REPAIR OR REPLACE HARNESS AND CONNECTOR 
    1. Repair or replace the harness and connector.
    2. Check for any momentary interruption between the skid control ECU and each sensor or ECM (See HOW TO PROCEED WITH TROUBLESHOOTING  ).
    3. Check that there is no momentary interruption.

      NEXT 

  4. RECONFIRM DTC 
    1. Clear the DTC (See DTC CHECK / CLEAR  ).
    2. Start the engine.
    3. Drive the vehicle and turn the steering wheel to the right and left at a speed of 9 mph (15 km/h) or more.
    4. Check that no CAN communication system DTC is output.
    5. If ABS and VSC DTCs are output, record them.

      Result 

      RESULT REFERENCE

      Display (DTC Output) Proceed To
      DTC output for the CAN communication system A
      No DTC is output (ABS and VSC DTCs are output) B (See SYSTEM DIAGRAM  )
      No DTC is output (No ABS and VSC DTCs are output) C

      HINT:

      The CAN communication system must be normal when repairing each sensor DTC (for ABS and VSC).

      B : REPAIR CIRCUIT INDICATED BY OUTPUT CODE 

      C : END 

      A : REPAIR CAN COMMUNICATION SYSTEM 

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