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Home >> Nissan-Datsun >> 2006 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1148 To P2A00 (Qr25DE) >> DTC P1564 ASCD Steering Switch >> Diagnostic Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Diagnostic Procedure

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

      Refer to "GROUND INSPECTION ".

    Fig 1: Locating M28 & M54 Body Ground Screws
    G04166617Courtesy 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-II 

    1. Turn ignition switch ON.
    2. Select "MAIN SW", "RESUME/ACC SW", "SET SW and "CANCEL SW" in "DATA MONITOR" mode with CONSULT-II.
      3. Fig 2: CONSULT-II Display - DATA MONITOR
      G04192120Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check each item indication under the following conditions.
    SWITCH & MONITOR ITEM SPECIFICATION

    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-II 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 99 and ground with pressing each button.
      3. Fig 3: Checking Voltage Between ECM Terminal 99 And Ground
      G04192121Courtesy of NISSAN MOTOR CO., U.S.A.
    VOLTAGE REFERENCE CHART

    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

    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 ASCD steering switch harness connector.
      Fig 4: Disconnecting ASCD Steering Switch Harness Connector
      G04192122Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Disconnect ECM harness connector.
    4. Check harness continuity between ASCD steering switch terminal 1 and ECM terminal 67.

      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.

    • Harness connectors M401, M102
    • Harness connectors M59, F27
    • Spiral cable
    • Harness for open or short between ECM and ASCD steering 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 99 and ASCD steering switch terminal 4.

      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 M401, M102
    • Harness connectors M59, F27
    • Spiral cable
    • Harness for open or short between ECM and ASCD steering 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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