FOUR WHEEL DRIVE CONTROL SYSTEM, Diagnostic DTC:U0073/86, U0100/85, U0126/84, U0129/83

DTC Code DTC Name
U0073/86 Control Module Communication Bus OFF
U0100/85 Lost Communication with ECM / PCM "A"
U0126/84 Lost Communication with Steering Angle Sensor Module
U0129/83 Lost Communication with Brake System Control Module

DESCRIPTION


DTC No. DTC Detection Condition Trouble Area
U0073/86

  1. When the following continues for 5 seconds or more:


    • Signals from the 4WD ECU assembly are not received.

  2. When the following occurs 10 times consecutively:


    • A communication malfunction (bus off) occurs one or more times within 0.1 seconds.

  • Wire harness (CANL, CANH circuit)

  • 4WD ECU assembly
U0100/85

  1. When both of the following continue for 2 seconds or more:


    • The voltage of the IG1 terminal is 10 V or more.

    • At a vehicle speed of 60 km/h (38 mph) or more, communication with the ECM cannot be performed.

  • Wire harness (CANL, CANH circuit)

  • 4WD ECU assembly

  • ECM
U0126/84

  1. When both of the following continue for 1 second or more:


    • The voltage of the IG1 terminal is 10 V or more.

    • Communication with the steering sensor cannot be performed.

  2. When both of the following occur 10 times consecutively:


    • The voltage of the IG1 terminal is 10 V or more.

    • The condition that communication with the steering sensor cannot be performed occurs once within 5 seconds.

  • Wire harness (CANL, CANH circuit)

  • 4WD ECU assembly

  • Steering sensor
U0129/83

  1. When both of the following continue for 3 seconds or more:


    • The voltage of the IG1 terminal is 10 V or more.

    • Communication with the skid control ECU (brake actuator assembly) cannot be performed.

  • Wire harness (CANL, CANH circuit)

  • 4WD ECU assembly

  • Skid control ECU (brake actuator assembly)

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC


    1. Check DTC Click here.

    2. Record the output DTC (4WD control system).

      Tech Tips

      When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.


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