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Home › Nissan-Datsun › 2012 › Sentra SE-R › Repair and Diagnosis › Engine Performance › System › Engine Control System - DTCS P0603 To P2A03 (Qr25DE) › DTC P1564: ASCD Steering Switch › Diagnosis Procedure

Diagnosis Procedure

  1. CHECK GROUND CONNECTIONS
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body.

    Refer to "GROUND INSPECTION ".

    Fig 1: Identifying Body Ground (E9 And E15) And Washer Tank With Fuse And Fusible Link Box
    G08185398Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO 2.

    NG: Repair or replace ground connections.

  2. CHECK ASCD STEERING SWITCH CIRCUIT

    With CONSULT 

    1. Turn ignition switch ON.
    2. Select "MAIN SW", "RESUME/ACC SW", "SET SW and "CANCEL SW" in "DATA MONITOR" mode with CONSULT.
    3. Check each item indication under the following 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 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 85 and ground with pressing each button.
    Switch Condition Voltage (V)
    MAIN switch Pressed Approx. 0
    Released Approx. 4.0
    CANCEL switch Pressed Approx. 1.0
    Released Approx. 4.0
    RESUME/ACCELERATE switch Pressed Approx. 3.0
    Released Approx. 4.0
    SET/COAST switch Pressed Approx. 2.0
    Released Approx. 4.0
    Fig 2: Checking ASCD Steering Switch Circuit
    G04926155Courtesy of NISSAN NORTH AMERICA, INC.

    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 combination switch harness connector M78.
    3. Disconnect ECM harness connector.
    4. Check harness continuity between combination switch terminal 20 (unit side) and ECM terminal 92. Refer to Wiring Diagram .

      Continuity should exist  .

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

    OK or NG 

    OK: GO TO  5.

    NG: GO TO 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors M2, E4
    • 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 85 and combination switch terminal 16. 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.

    • Harness connectors M2, E4
    • 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 ASCD steering switch. Refer to , "REMOVAL AND INSTALLATION ".

  8. CHECK INTERMITTENT INCIDENT

Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

INSPECTION END 

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