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Home >> Infiniti >> 2016 >> Q50 Base, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 123 (Hybrid Motor System (Diagnostic Trouble Codes (DTCS) P2122-P31FF And Circuit Diagnosis) (Hybrid)) >> DTC / Circuit Diagnosis >> DTC P31F9, P31FA: ASCD Steering Switch >> Diagnosis Procedure >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

  1. CHECK DTC PRIORITY

    If DTC P31F9 or P31FA is displayed with DTC P0A1D, first perform the confirmation procedure (trouble diagnosis) for P0A1D.

    Is applicable DTC detected?

    YES 

    Perform diagnosis of applicable. Refer to DTC INDEX .

    NO 

    GO TO STEP 2  .

  2. INSPECTION START

    Check which type the vehicle is equipped with.

    Which type?

    Without ICC models 

    GO TO STEP 3  .

    With ICC models 

    GO TO STEP 7  .

  3. CHECK ASCD STEERING SWITCH CIRCUIT

    G-20 With CONSULT

    1. Turn ignition switch ON.
    2. Select "ASCD SET SW", "RESUME/ACC SW", "CANCEL SW" and "MAIN SW" in "DATA MONITOR" mode of "ENGINE" using CONSULT.
    3. Check each item indication as per the following conditions.
      Monitor item Condition Indication
      ASCD SET SW SET/COAST switch Pressed On
      Released Off
      RESUME/ACC SW RESUME/ACCELERATE switch Pressed On
      Released Off
      CANCEL SW CANCEL switch Pressed On
      Released Off
      MAIN SW MAIN switch Pressed On
      Released Off

    G-21 Without CONSULT

    1. Turn ignition switch ON.
    2. Check the voltage between HPCM harness connector terminals as per the following.
      HPCM Condition Voltage
      (Approx.)
      Connector + ?
      Terminal
      B14 5 4 MAIN switch: Pressed 0 V
      CANCEL switch: Pressed 1.0 V
      SET/COAST switch: Pressed 2.0 V
      RESUME/ACCELERATE switch: Pressed 3.0 V
      All steering switches: Released 4.0 V

    Is the inspection result normal?

    YES 

    Perform INTERMITTENT INCIDENT .

    NO 

    GO TO STEP 4  .

  4. CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT

    1. Turn ignition switch OFF.
    2. Disconnect HPCM harness connector.
    3. Disconnect combination switch harness connector.
    4. Check the continuity between combination switch and HPCM harness connector.
      + - Continuity
      Combination switch HPCM
      Connector Terminal Connector Terminal
      M87 32 B14 4 Existed
    5. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Repair or replace error-detected parts.

  5. CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

    1. Check the continuity between combination switch and HPCM harness connector.
      + - Continuity
      Combination switch HPCM
      Connector Terminal Connector Terminal
      M87 25 B14 5 Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    Repair or replace error-detected parts.

  6. CHECK ASCD STEERING SWITCH

    Refer to COMPONENT INSPECTION (ASCD STEERING SWITCH) .

    Is the inspection result normal?

    YES 

    Perform INTERMITTENT INCIDENT .

    NO 

    Replace steering wheel. Refer to REMOVAL AND INSTALLATION .

  7. CHECK ICC STEERING SWITCH CIRCUIT

    G-20 With CONSULT

    1. Turn ignition switch ON.
    2. Select "ASCD SET SW", "RESUME/ACC SW", "CANCEL SW", "MAIN SW" and "DISTANCE SW" in "DATA MONITOR" mode of "ENGINE" using CONSULT.
    3. Check each item indication as per the following conditions.
      Monitor item Condition Indication
      ASCD SET SW SET/COAST switch Pressed On
      Released Off
      RESUME/ACC SW RESUME/ACCELERATE switch Pressed On
      Released Off
      CANCEL SW CANCEL switch Pressed On
      Released Off
      MAIN SW MAIN switch Pressed On
      Released Off
      DISTANCE SW DISTANCE switch Pressed On
      Released Off

    G-21 Without CONSULT

    1. Turn ignition switch ON.
    2. Check the voltage between HPCM harness connector terminals as per the following.
      HPCM Condition Voltage
      (Approx.)
      Connector + ?
      Terminal
      B14 5 4 MAIN switch: Pressed 0 V
      Dynamic driver assistance switch: Pressed 1.0 V
      CANCEL switch: Pressed 1.9 V
      DISTANCE switch: Pressed 2.6 V
      SET/COAST switch: Pressed 3.2 V
      RESUME/ACCELERATE switch: Pressed 3.7 V
      All steering switches: Released 4.2 V

    Is the inspection result normal?

    YES 

    Perform INTERMITTENT INCIDENT .

    NO 

    GO TO STEP 8  .

  8. CHECK ICC STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT

    1. Turn ignition switch OFF.
    2. Disconnect HPCM harness connector.
    3. Disconnect combination switch harness connector.
    4. Check the continuity between combination switch and HPCM harness connector.
      + - Continuity
      Combination switch HPCM
      Connector Terminal Connector Terminal
      M87 32 B14 4 Existed
    5. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 9  .

    NO 

    Repair or replace error-detected parts.

  9. CHECK ICC STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

    1. Check the continuity between combination switch and HPCM harness connector.
      + - Continuity
      Combination switch HPCM
      Connector Terminal Connector Terminal
      M87 25 B14 5 Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 10  .

    NO 

    Repair or replace error-detected parts.

  10. CHECK ICC STEERING SWITCH

    Refer to COMPONENT INSPECTION (ICC STEERING SWITCH) .

    Is the inspection result normal?

    YES 

    Perform INTERMITTENT INCIDENT .

    NO 

    Replace steering wheel. Refer to REMOVAL AND INSTALLATION .

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