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Home >> Nissan-Datsun >> 2005 >> Sentra Base, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control System (QG18DE) >> DTC P1564: ASCD Steering Switch >> Diagnostic Procedure

Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten two ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 1: Identifying ECM Ground Screws On Body
      G02450399Courtesy 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. Check each item indication under the conditions listed in Fig 2.
      Fig 2: ASCD Steering Switch Testing Condition Chart
      G02450400Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 3: CONSULT-II Display - DATA MONITOR Mode
      G02450401Courtesy 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: ASCD Steering Switch Voltage Versus Testing Condition Chart
      G02450402Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 5: Checking Voltage Between ECM Connector Terminal 99 Ground
      G02450403Courtesy 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 ASCD steering switch harness connector.
      Fig 6: Removing ASCD Steering Switch
      G02450404Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Disconnect ECM harness connector.
    4. Disconnect TCM harness connector.
    5. Check harness continuity between ASCD steering switch terminal 1 and ECM terminal 67, TCM terminal 42. Refer to WIRING DIAGRAM .
      • Continuity should exist. 
    6. Also check harness for 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 and short between ECM and ASCD steering switch
    • Harness for open and short between TCM and ASCD steering 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 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 and short between ECM and ASCD steering switch
      • : Repair open circuit or short to ground 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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