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Home >> Infiniti >> 2017 >> Q50 Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 195 (Brake Control System (With VDC) (Diagnostic Trouble Codes (DTCS) C1113-U110D And Circuit Diagnosis) (Hybrid)) >> DTC / Circuit Diagnosis >> DTC C1143: Steering Angle Sensor >> Diagnosis Procedure >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2016 Infiniti Q50. However, it is still accessible from the selected car via links, so may be relevant.

  1. ADJUST THE NEUTRAL POSITION OF STEERING ANGLE SENSOR

    G-20 With CONSULT

    Perform neutral position adjustment of steering angle sensor. Refer to DESCRIPTION .

    GO TO STEP 2  .

  2. PERFORM SELF-DIAGNOSIS (1)

    G-20 With CONSULT

    1. Turn the ignition switch OFF.
      NOTE:

      Wait at least 10 seconds after turning ignition switch OFF.

    2. Set the vehicle to READY/Start the engine.
      NOTE:

      Wait at least 10 seconds after set the vehicle to READY/start the engine.

    3. Repeat step 1 to 2 two or more times.
    4. Perform self-diagnosis for "ABS".

    Is DTC "C1143" detected?

    YES - 1 

    "CRNT" is displayed: GO TO STEP 3  .

    YES - 2 

    "PAST" is displayed: INSPECTION END (Erase the memory of self - diagnosis results.)

    NO 

    INSPECTION END

  3. 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 steering angle sensor harness connector for disconnection or looseness.

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Repair / replace harness or connector, securely lock the connector, and GO TO STEP 4  .

  4. PERFORM SELF-DIAGNOSIS (2)

    G-20 With CONSULT

    1. Turn the ignition switch OFF.
      NOTE:

      Wait at least 10 seconds after turning ignition switch OFF.

    2. Set the vehicle to READY/Start the engine.
      NOTE:

      Wait at least 10 seconds after set the vehicle to READY/start the engine.

    3. Repeat step 1 to 2 two or more times.
    4. Perform self-diagnosis for "ABS".

    Is DTC "C1143" detected?

    YES 

    GO TO STEP 5  .

    NO 

    INSPECTION END

  5. CHECK STEERING ANGLE SENSOR POWER SUPPLY

    1. Turn the ignition switch OFF.
    2. Disconnect steering angle sensor harness connector.
    3. Check the voltage between steering angle sensor harness connector and ground.
      + - Voltage
      Steering angle sensor
      Connector Terminal
      M77 4 Ground Approx. 0 V
    4. Turn the ignition switch ON.
      NOTE:

      Set the vehicle to READY/Start the engine.

    5. Check the voltage between steering angle sensor harness connector and ground.
      + - Voltage
      Steering angle sensor
      Connector Terminal
      M77 4 Ground 10 - 16 V

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    GO TO STEP 6  .

  6. CHECK STEERING ANGLE SENSOR POWER SUPPLY CIRCUIT

    1. Turn the ignition switch OFF.
    2. Check the 10A fuse (#22).
    3. Disconnect fuse block (J/B) harness connector.
    4. Check the continuity between steering angle sensor harness connector and fuse block (J/B) harness connector.
      Steering angle sensor Fuse block (J/B) Continuity
      Connector Terminal Connector Terminal
      M77 4 M133 8C Existed
    5. Check the continuity between steering angle sensor harness connector and ground.
      Steering angle sensor - Continuity
      Connector Terminal
      M77 4 Ground Not existed

    Is the inspection result normal?

    YES 

    Perform trouble diagnosis for ignition power supply.

    NO 

    Repair / replace harness, connector, or fuse.

  7. CHECK STEERING ANGLE SENSOR GROUND CIRCUIT

    1. Turn the ignition switch OFF.
    2. Check the continuity between steering angle sensor harness connector and ground.
      Steering angle sensor - Continuity
      Connector Terminal
      M77 1 Ground Existed

    Is the inspection result normal?

    YES 

    GO TO STEP 8  .

    NO 

    Repair / replace harness or connector.

  8. 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 STEP 9  .

    NO 

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

  9. CHECK TERMINAL

    1. Check the steering angle sensor pin terminals for damage or loose connection with harness connector.
    2. Check the fuse block (J/B) pin terminals for damage or loose connection with harness connector.

    Is the inspection result normal?

    YES 

    GO TO STEP 10  .

    NO 

    Repair / replace harness, connector, or terminal.

  10. CHECK CAN COMMUNICATION LINE

    1. Connect steering angle sensor harness connector.
    2. Connect fuse block (J/B) harness connector.
    3. Check the CAN communication line. Refer to TROUBLE DIAGNOSIS FLOW CHART .

    Is the inspection result normal?

    YES 

    GO TO STEP 11  .

    NO 

    Repair / replace harness or connector. Refer to PRECAUTIONS FOR HARNESS REPAIR .

  11. CHECK DATA MONITOR

    G-20 With CONSULT

    1. "ABS", "DATA MONITOR" and "STR ANGLE SIG" according to this order.
    2. Check that the indication changes with the steering angle when the steering wheel is turned left/right from the neutral position. Refer to REFERENCE VALUE .

    Is the inspection result normal?

    YES 

    Replace the ABS actuator and electric unit (control unit). Refer to REMOVAL AND INSTALLATION .

    NO 

    Replace the steering angle sensor. Refer to REMOVAL AND INSTALLATION .

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