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Home >> Infiniti >> 2021 >> QX80 Premium Select, AWD >> Repair and Diagnosis >> Brakes >> Traction Control >> Brake Control System (DTCS) >> Abs [Abs Actuator And Electric Unit (Control Unit)] >> DTC C1108: Wheel Sensor >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

CAUTION: Never check between wheel sensor harness connector terminals.
  1. CHECK WHEEL HUB ASSEMBLY 

    Check that there is no excessive looseness in front LH wheel hub assembly. Refer to FRONT WHEEL HUB AND KNUCKLE : Periodic Maintenance Operation .

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    Repair or replace the front LH wheel hub assembly. Refer to FRONT WHEEL HUB AND KNUCKLE : Removal & Installation . GO TO 2.

  2. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY AND GROUND CIRCUIT 

    Check the ABS actuator and electric unit (control unit) power supply and ground circuit. Refer to Diagnosis Procedure .

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair / replace harness, connector, terminal, fuse, or fusible link.

  3. CHECK TIRE 
    1. Turn the ignition switch OFF.
    2. Check the front LH tire air pressure, wear and size. Refer to TIRE AIR PRESSURE : Service Data .

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    Adjust air pressure or replace front LH tire, and GO TO 4.

  4. CHECK DATA MONITOR (1) 

    SYMBOL With CONSULT

    1. Erase self-diagnosis result for "ABS".
    2. Turn the ignition switch OFF -> ON -> OFF.
      NOTE: Wait at least 10 seconds after turning ignition switch OFF or ON.
    3. Start the engine.
    4. Select "ABS" and "DATA MONITOR", check "FR LH SENSOR", "FR RH SENSOR", "RR LH SENSOR" and "RR RH SENSOR".
      NOTE: Set the "DATA MONITOR" recording speed to "10 msec".
    5. Read a value (wheel speed) of all wheel sensor.
      NOTE: Vehicle must be driven after repair or replacement to erase the previous DTCs.

    Note the difference at 50 km/h (31 MPH) between the wheel speed detected by front LH wheel sensor and the maximum/minimum wheel speed detected by other front LH wheel sensors, is the difference within 5%, respectively?

    YES

    GO TO 5.

    NO

    GO TO 6.

  5. PERFORM SELF-DIAGNOSIS (1) 

    SYMBOL With CONSULT

    1. Stop the vehicle.
    2. Turn the ignition switch OFF.
      NOTE: Wait at least 10 seconds after turning ignition switch OFF.
    3. Start the engine.
      NOTE: Wait at least 10 seconds after start the engine.
    4. Perform self-diagnosis for "ABS".

    Is DTC "C1108" detected?

    YES

    GO TO 6.

    NO

    INSPECTION END

  6. CHECK WHEEL SENSOR 
    1. Turn the ignition switch OFF.
    2. Check the front LH wheel sensor for damage.

    Is the inspection result normal?

    YES

    GO TO 7.

    NO

    GO TO 8.

  7. CHECK WHEEL SENSOR OUTPUT SIGNAL 
    1. Disconnect ABS actuator and electric unit (control unit) harness connector.
    2. Connect ABS active wheel sensor tester (SST: J-45741-A) to front LH wheel sensor using appropriate adapter.
    3. Turn the ABS active wheel sensor tester power switch ON.
      NOTE: The green POWER indicator should illuminate. If the POWER indicator does not illuminate, replace the battery in the ABS active wheel sensor tester before proceeding.
    4. Spin the wheel of the vehicle by hand and observe the red SENSOR indicator on the ABS active wheel sensor tester. The red SENSOR indicator should flash ON and OFF to indicate an output signal.
      NOTE: If the red SENSOR indicator illuminates but does not flash, reverse the polarity of the tester leads and retest.

    Does the ABS active wheel sensor tester detect a signal?

    YES

    GO TO 11.

    NO

    GO TO 8.

  8. REPLACE WHEEL SENSOR (1) 

    SYMBOL With CONSULT

    1. Replace the front LH wheel sensor. Refer to FRONT WHEEL SENSOR : Removal & Installation .
    2. Connect ABS actuator and electric unit (control unit) harness connector.
    3. Erase self-diagnosis result for "ABS".
    4. Turn the ignition switch OFF -> ON -> OFF.
      NOTE: Wait at least 10 seconds after turning ignition switch OFF or ON.
    5. Start the engine.
    6. Select "ABS" and "DATA MONITOR", check "FR LH SENSOR", "FR RH SENSOR", "RR LH SENSOR" and "RR RH SENSOR".
      NOTE: Set the "DATA MONITOR" recording speed to "10 msec".
    7. Read a value (wheel speed) of all wheel sensor.
      NOTE: Vehicle must be driven after repair or replacement to erase the previous DTCs.

    Note the difference at 50 km/h (31 MPH) between the wheel speed detected by front LH wheel sensor and the maximum/minimum wheel speed detected by other front LH wheel sensors, is the difference within 5%, respectively?

    YES

    GO TO 9.

    NO

    GO TO 19.

  9. PERFORM SELF-DIAGNOSIS (2) 

    SYMBOL With CONSULT

    1. Stop the vehicle.
    2. Turn the ignition switch OFF.
      NOTE: Wait at least 10 seconds after turning ignition switch OFF.
    3. Start the engine.
      NOTE: Wait at least 10 seconds after start the engine.
    4. Perform self-diagnosis for "ABS".

    Is DTC "C1108" detected?

    YES

    GO TO 10.

    NO

    INSPECTION END

  10. CHECK CONNECTOR 
    1. Turn the ignition switch OFF.
    2. Check the ABS actuator and electric unit (control unit) harness connector for disconnection or looseness.
    3. Check the front LH wheel sensor harness connector for disconnection or looseness.

    Is the inspection result normal?

    YES

    GO TO 13.

    NO

    Repair / replace harness or connector, securely lock the connector, and GO TO 11.

  11. CHECK DATA MONITOR (2) 

    SYMBOL With CONSULT

    1. Erase self-diagnosis result for "ABS".
    2. Turn the ignition switch OFF -> ON -> OFF.
      NOTE: Wait at least 10 seconds after turning ignition switch OFF or ON.
    3. Start the engine.
    4. Select "ABS" and "DATA MONITOR", check "FR LH SENSOR", "FR RH SENSOR", "RR LH SENSOR" and "RR RH SENSOR".
      NOTE: Set the "DATA MONITOR" recording speed to "10 msec".
    5. Read a value (wheel speed) of all wheel sensor.
      NOTE: Vehicle must be driven after repair or replacement to erase the previous DTCs.

    Note the difference at 50 km/h (31 MPH) between the wheel speed detected by front LH wheel sensor and the maximum/minimum wheel speed detected by other front LH wheel sensors, is the difference within 5%, respectively?

    YES

    GO TO 12.

    NO

    GO TO 13.

  12. PERFORM SELF-DIAGNOSIS (3) 

    SYMBOL With CONSULT

    1. Stop the vehicle.
    2. Turn the ignition switch OFF.
      NOTE: Wait at least 10 seconds after turning ignition switch OFF.
    3. Start the engine.
      NOTE: Wait at least 10 seconds after start the engine.
    4. Perform self-diagnosis for "ABS".

    Is DTC "C1108" detected?

    YES

    GO TO 13.

    NO

    INSPECTION END

  13. CHECK TERMINAL 
    1. Turn the ignition switch OFF.
    2. Disconnect ABS actuator and electric unit (control unit) harness connector and then check the ABS actuator and electric unit (control unit) terminals for damage or loose connection with harness connector.
    3. Disconnect front LH wheel sensor harness connector and check front LH wheel sensor terminals for damage or loose connection with harness connector.

    Is the inspection result normal?

    YES

    GO TO 16.

    NO

    Repair / replace harness, connector, or terminal, and GO TO 14.

  14. CHECK DATA MONITOR (3) 

    SYMBOL With CONSULT

    1. Connect ABS actuator and electric unit (control unit) harness connector.
    2. Connect front LH wheel sensor harness connector.
    3. Erase self-diagnosis result for "ABS".
    4. Turn the ignition switch OFF -> ON -> OFF.
      NOTE: Wait at least 10 seconds after turning ignition switch OFF or ON.
    5. Start the engine.
    6. Select "ABS" and "DATA MONITOR", check "FR LH SENSOR", "FR RH SENSOR", "RR LH SENSOR" and "RR RH SENSOR".
      NOTE: Set the "DATA MONITOR" recording speed to "10 msec".
    7. Read a value (wheel speed) of all wheel sensor.
      NOTE: Vehicle must be driven after repair or replacement to erase the previous DTCs.

    Note the difference at 50 km/h (31 MPH) between the wheel speed detected by front LH wheel sensor and the maximum/minimum wheel speed detected by other front LH wheel sensors, is the difference within 5%, respectively?

    YES

    GO TO 15.

    NO

    GO TO 16.

  15. PERFORM SELF-DIAGNOSIS (4) 

    SYMBOL With CONSULT

    1. Stop the vehicle.
    2. Turn the ignition switch OFF.
      NOTE: Wait at least 10 seconds after turning ignition switch OFF.
    3. Start the engine.
      NOTE: Wait at least 10 seconds after start the engine.
    4. Perform self-diagnosis for "ABS".

    Is DTC "C1108" detected?

    YES

    GO TO 16.

    NO

    INSPECTION END

  16. CHECK WHEEL SENSOR HARNESS 
    1. Turn the ignition switch OFF.
    2. Disconnect ABS actuator and electric unit (control unit) harness connector.
    3. Disconnect front LH wheel sensor harness connector.
    4. Check the continuity between ABS actuator and electric unit (control unit) harness connector and the ground.

      ABS actuator and electric unit (control unit)

      --

      Continuity

      Connector

      Terminal

      E36

      20, 34

      Ground

      Not existed

    Is the inspection result normal?

    YES

    GO TO 17.

    NO

    Repair / replace harness or connector, and GO TO 17.

  17. CHECK DATA MONITOR (4) 

    SYMBOL With CONSULT

    1. Connect ABS actuator and electric unit (control unit) harness connector.
    2. Connect front LH wheel sensor harness connector.
    3. Erase self-diagnosis result for "ABS".
    4. Turn the ignition switch OFF -> ON -> OFF.
      NOTE: Wait at least 10 seconds after turning ignition switch OFF or ON.
    5. Start the engine.
    6. Select "ABS" and "DATA MONITOR", check "FR LH SENSOR", "FR RH SENSOR", "RR LH SENSOR" and "RR RH SENSOR".
      NOTE: Set the "DATA MONITOR" recording speed to "10 msec".
    7. Read a value (wheel speed) of all wheel sensor.
      NOTE: Vehicle must be driven after repair or replacement to erase the previous DTCs.

    Note the difference at 50 km/h (31 MPH) between the wheel speed detected by front LH wheel sensor and the maximum/minimum wheel speed detected by other front LH wheel sensors, is the difference within 5%, respectively?

    YES

    GO TO 18.

    NO

    Replace the ABS actuator and electric unit (control unit). Refer to ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) : Removal & Installation .

  18. PERFORM SELF-DIAGNOSIS (5) 

    SYMBOL With CONSULT

    1. Stop the vehicle.
    2. Turn the ignition switch OFF.
      NOTE: Wait at least 10 seconds after turning ignition switch OFF.
    3. Start the engine.
      NOTE: Wait at least 10 seconds after start the engine.
    4. Perform self-diagnosis for "ABS".

    Is DTC "C1108" detected?

    YES

    Replace the ABS actuator and electric unit (control unit). Refer to ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) : Removal & Installation .

    NO

    INSPECTION END

  19. REPLACE SENSOR ROTOR 

    SYMBOL With CONSULT

    1. Replace the front LH sensor rotor. Refer to FRONT SENSOR ROTOR : Removal & Installation .
    2. Erase self-diagnosis result for "ABS".
    3. Turn the ignition switch OFF -> ON -> OFF.
      NOTE: Wait at least 10 seconds after turning ignition switch OFF or ON.
    4. Start the engine.
    5. Drive the vehicle at approximately 50 km/h (31 MPH) or more for approximately 2 minutes.
      NOTE: Vehicle must be driven after repair or replacement to erase the previous DTCs.
    6. Stop the vehicle.
    7. Turn the ignition switch OFF.
      NOTE: Wait at least 10 seconds after turning ignition switch OFF.
    8. Start the engine.
      NOTE: Wait at least 10 seconds after start the engine.
    9. Perform self-diagnosis for "ABS".

    Is DTC "C1108" detected?

    YES

    Replace the ABS actuator and electric unit (control unit). Refer to ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) : Removal & Installation .

    NO

    INSPECTION END

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