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Home >> Infiniti >> 2021 >> QX80 Premium Select, AWD >> Repair and Diagnosis >> Brakes >> Brakes Control Systems >> Brake Control System (DTCS) >> Abs [Abs Actuator And Electric Unit (Control Unit)] >> DTC C1146: Yaw Rate/Side/DECEL G Sensor >> DTC Diagnosis Procedure
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DTC Diagnosis Procedure

CAUTION:
  • A malfunction in yaw rate/side/decel G sensor system may be detected when the vehicle sharply turns during a spin turn, acceleration turn or drift driving while VDC function is OFF (VDC OFF indicator lamp is in ON status). This is not a malfunction if the status returns to normal after engine is started again. In that case, erase self-diagnosis result memory using CONSULT.
  • When the engine is in running status and the vehicle is on a turntable at the entrance of parking lot or on a moving unit, VDC warning lamp may turn ON and "ABS" self-diagnosis may display "YAW RATE SENSOR". In this case, yaw rate sensor is not malfunctioning. The status returns to normal when the vehicle is left from the turntable or moving unit and the engine is started again. In that case, erase self-diagnosis result memory using CONSULT.
  1. CHECK YAW RATE/SIDE/DECEL G SENSOR POWER SUPPLY 
    1. Turn the ignition switch OFF.
    2. Disconnect yaw rate/side/decel G sensor harness connector.
    3. Check the voltage between yaw rate/side/decel G sensor harness connector and ground.

      +

      -

      Voltage

      Yaw rate/side/decel G sensor

      Connector

      Terminal

      M55

      3

      Ground

      Approx. 0 V
    4. Turn the ignition switch ON.
      NOTE: Never start engine.
    5. Check the voltage between yaw rate/side/decel G sensor harness connector and ground.

      +

      -

      Voltage

      Yaw rate/side/decel G sensor

      Connector

      Terminal

      M55

      3

      Ground

      12V battery voltage

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    GO TO 2.

  2. CHECK YAW RATE/SIDE/DECEL G SENSOR POWER SUPPLY CIRCUIT 
    1. Turn the ignition switch OFF.
    2. Check the 10A fuse (#57).
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between yaw rate/side/decel G sensor harness connector and IPDM E/R harness connector.

      Yaw rate/side/decel G sensor

      IPDM E/R

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M55

      3

      E15

      59

      Existed
    5. Check the continuity between yaw rate/side/decel G sensor harness connector and ground.

      Yaw rate/side/decel G sensor

      --

      Continuity

      Connector

      Terminal

      M55

      3

      Ground

      Not existed

    Is the inspection result normal?

    YES

    Perform trouble diagnosis for ignition power supply.

    NO

    Repair / replace harness, connector, or fuse.

  3. CHECK YAW RATE/SIDE/DECEL G SENSOR GROUND CIRCUIT 
    1. Turn the ignition switch OFF.
    2. Check the continuity between yaw rate/side/decel G sensor harness connector and ground.

      Yaw rate/side/decel G sensor

      --

      Continuity

      Connector

      Terminal

      M55

      6

      Ground

      Existed

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Repair / replace harness or connector.

  4. 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 5.

    NO

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

  5. CHECK COMMUNICATION LINE 

    Check the continuity between yaw rate/side/decel G sensor harness connector and ABS actuator and electric unit (control unit) harness connector.

    Yaw rate/side/decel G sensor

    ABS actuator and electric unit (control unit)

    Continuity

    Connector

    Terminal

    Connector

    Terminal

    M55

    4

    E36

    9

    Existed

    5

    10

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    Repair / replace harness or connector.

  6. CHECK TERMINAL 
    1. Check the ABS actuator and electric unit (control unit) terminals for damage or loose connection with harness connector.
    2. Check the yaw rate/side/decel G sensor terminals for damage or loose connection with harness connector.
    3. Check the IPDM E/R terminals for damage or loose connection with harness connector.

    Is the inspection result normal?

    YES

    GO TO 7.

    NO

    Repair / replace harness, connector, or terminal.

  7. REPLACE YAW RATE/SIDE/DECEL G SENSOR 

    SYMBOL With CONSULT.

    1. Connect ABS actuator and electric unit (control unit) harness connector.
    2. Replace the yaw rate/side/decel G sensor. Refer to YAW RATE/SIDE/DECEL G SENSOR : Removal & Installation .
    3. Erase self-diagnosis result for "ABS".
    4. Turn the ignition switch OFF.
    5. Turn the ignition switch ON.
      NOTE: Never start engine.
    6. Perform self-diagnosis for "ABS".

    Is DTC "C1146" 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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