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Home › Nissan-Datsun › 2008 › 350Z 2D Convertible, Standard › Repair and Diagnosis › Engine Performance › Engine Control Systems › Engine Control System - DTCS P1217 To P2A03 › DTC P1564 ASCD Steering Switch › Diagnostic Procedure

Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 

    Models with FDC system, navigation system or telephone 

    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 1: Identifying Body Ground Screws (Models With FDC System)
      G04875171Courtesy of NISSAN MOTOR CO., U.S.A.

    Models without FDC system, navigation system and telephone 

    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 2: Identifying Body Ground Screws (Models Without FDC System)
      G04875394Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 2.

    NG: Repair or replace ground connections.

  2. CHECK ASCD STEERING SWITCH CIRCUIT 

    With CONSULT-III 

    1. Turn ignition switch ON.
    2. Select "MAIN SW", "RESUME/ACC SW", "SET SW" and "CANCEL SW" in "DATA MONITOR" mode with CONSULT-III.
    3. Check each item indication under the following conditions.
      ASCD STEERING SWITCH CIRCUIT CHECKING CONDITIONS

      Switch Monitor item Condition Indication
      MAIN switch MAIN SW Pressed ON
      Released OFF
      CANCEL switch CANCEL SW Pressed ON
      Released OFF
      RESUME/ACCELERATE switch RESUME/ACC SW Pressed ON
      Released OFF
      SET/COAST switch SET SW Pressed ON
      Released OFF

    Without CONSULT-III 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 101 and ground with pressing each button.
      VOLTAGE SPECIFICATION

      Switch Condition Voltage [V]
      MAIN switch Pressed Approx. 0
      Released Approx. 4
      CANCEL switch Pressed Approx. 1
      Released Approx. 4
      RESUME/ACCELERATE switch Pressed Approx. 3
      Released Approx. 4
      SET/COAST switch Pressed Approx. 2
      Released Approx. 4
      Fig 3: Checking Voltage Between ECM Terminal 101 And Ground
      G04875395Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  8.

    NG: GO TO 3.

  3. 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 M203.
    4. Check harness continuity between combination switch terminal 15 and ECM terminal 108. Refer to WIRING DIAGRAM .

      Continuity should exist  .

    5. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  5.

    NG: GO TO 4.

  4. DETECT MALFUNCTIONING PART 

    Check the following.

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

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

  5. CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between ECM terminal 101 and combination switch terminal 14. Refer to WIRING DIAGRAM .

      Continuity should exist  .

    2. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  7.

    NG: GO TO 6.

  6. DETECT MALFUNCTIONING PART 

    Check the following.

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

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

  7. CHECK ASCD STEERING SWITCH 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 8.

    NG: Replace steering wheel.

  8. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

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