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Home >> Infiniti >> 2008 >> FX35 AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS P1212 Through P2A03 (VQ35DE) >> DTC P1564 ASCD Steering Switch >> Diagnostic Procedure

Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screw on the body. Refer to "GROUND INSPECTION ".
    Fig 1: Identifying Body Ground, Steering Column And Blower Motor
    G05216304Courtesy 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.
    MONITOR ITEMS AND INDICATION REFERENCE

    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 99 and ground with pressing each button.
    VOLTAGE SPECIFICATION

    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 Voltage Between ECM Terminal 99 And Ground
    G04900663Courtesy 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 combination switch harness connector.
    3. Disconnect ECM harness connector.
    4. Check harness continuity between combination switch terminal 15 and ECM terminal 82. 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 power in harness or connectors.

  5. CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between ECM terminal 99 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 ASCD steering switch.

  8. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    >> INSPECTION END 

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