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Home >> Nissan-Datsun >> 2005 >> Quest Base >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> DTC P1564: ASCD Steering Switch >> Diagnostic Procedure
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Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 1: Loosening & Retightening Ground Screws
      G02474532Courtesy 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", "CANCEL SW", "RESUME/ACC SW" and "SET/COAST SW" in "DATA MONITOR" mode with CONSULT-II.
      Fig 2: CONSULT-II Data Monitor Display
      G02474534Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check each item indication under the following conditions.
      Fig 3: Switch Condition Reference Chart
      G02474533Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 99 and ground with pressing each button.
      Fig 4: Checking Voltage Between ECM Terminal 99 & Ground
      G02474536Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 5: Switch Condition Reference Chart
      G02474535Courtesy 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 
    Fig 6: Identifying/Locating ASCD Steering Switch
    G02474537Courtesy of NISSAN MOTOR CO., U.S.A.
    1. Turn ignition switch OFF.
    2. Disconnect combination switch harness connector M102.
    3. Disconnect ECM harness connector.
    4. Disconnect TCM harness connector.
    5. Check harness continuity between combination switch terminal 15 and ECM terminal 67, TCM terminal 42.

      Refer to WIRING DIAGRAM .

      • Continuity should exist. 
    6. 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 E5, F14
    • Harness connectors E19, F33
    • Harness connectors E26, M91
    • Combination switch (spiral cable)
    • Harness for open and short between ECM and combination switch
    • Harness for open and short between TCM 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 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.

    • Harness connectors E26, M91
    • 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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