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Home >> Infiniti >> 2017 >> QX80 Base, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 4) >> DTC/Circuit Diagnosis >> DTC P1564: ASCD Steering Switch >> Diagnosis Procedure >> Diagnostic Test

Diagnostic Test

  1. CHECK ASCD STEERING SWITCH CIRCUIT

    G-20 WITH CONSULT

    1. Turn ignition switch ON.
    2. Select "MAIN SW", "CANCEL SW", "RESUME/ACC SW" and "SET SW" in "DATA MONITOR" mode with CONSULT.
    3. Check each item indication under the following conditions.
      Monitor item Condition Indication
      MAIN SW MAIN switch Pressed ON
      Released OFF
      CANCEL SW CANCEL switch Pressed ON
      Released OFF
      RESUME/ACC SW RESUME/ACCELERATE switch Pressed ON
      Released OFF
      SET SW SET/COAST switch Pressed ON
      Released OFF

    G-21 WITHOUT CONSULT

    1. Turn ignition switch ON.
    2. Check the voltage between ECM harness connector terminals under the following conditions.
      ECM Condition Voltage (V)
      Connector + -
      Terminal Terminal
      E20 134
      (ASCD steering switch signal)      		 135 MAIN switch: Pressed Approx. 0
      CANCEL switch: Pressed Approx. 1
      SET/COAST switch: Pressed Approx. 2
      RESUME/ACCELERATE switch: Pressed Approx. 3
      All ASCD steering switches: Released Approx. 4

    Is the inspection result normal?

    YES 

    GO TO STEP  7.

    NO 

    GO TO STEP 2  .

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

    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect combination switch harness connector.
    4. Check the continuity between combination switch and ECM harness connector.
      Combination switch ECM Continuity
      Connector Terminal Connector Terminal
      - 32 E20 135 Existed
    5. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    GO TO STEP 3  .

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Combination switch (spiral cable)
    • Harness for open and short between ECM and combination switch

    Repair open circuit, short to ground or short to power in harness or connectors.

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

    1. Check the continuity between combination switch and ECM harness connector.
      Combination switch ECM Continuity
      Connector Terminal Connector Terminal
      - 25 E20 134 Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    GO TO STEP 5  .

  5. DETECT MALFUNCTIONING PART

    Check the following.

    • Combination switch (spiral cable)
    • Harness for open and short between ECM and combination switch

    Repair open circuit, short to ground or short to power in harness or connectors.

  6. CHECK ASCD STEERING SWITCH

    Refer to COMPONENT INSPECTION (ASCD STEERING SWITCH) .

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    Replace ASCD steering switch. Refer to REMOVAL AND INSTALLATION .

  7. CHECK INTERMITTENT INCIDENT

    Refer to INTERMITTENT INCIDENT .

    INSPECTION END

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