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Home › Nissan-Datsun › 2008 › 350Z 2D Convertible, Standard › Repair and Diagnosis › Engine Performance › Engine Control Systems › Engine Control System - DTCS P1217 To P2A03 › DTC P2122, P2123 App Sensor › Diagnostic Procedure

Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 

    Models with FDC system, navigation system or telephone 

    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 1: Identifying Body Ground Screws (Models With FDC System)
      G04875171Courtesy of NISSAN MOTOR CO., U.S.A.

    Models without FDC system, navigation system and telephone 

    1. Turn ignition switch OFF.
    2. Loosen and retighten ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 2: Identifying Body Ground Screws (Models Without FDC System)
      G04875172Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 2.

    NG: Repair or replace ground connections.

  2. CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT 
    1. Disconnect accelerator pedal position (APP) sensor harness connector.
    2. Turn ignition switch ON.
      Fig 3: Identifying Accelerator Pedal Position Sensor Harness Connector
      G04875309Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between APP sensor terminal 6 and ground with CONSULT-III or tester.

      Voltage: Approximately 5V 

    OK or NG 

    OK: GO TO  4.

    NG: GO TO 3.

    Fig 4: Checking Voltage Between APP Sensor Terminal 6 And Ground
    G04875310Courtesy of NISSAN MOTOR CO., U.S.A.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E108, M15
    • Harness for open or short between ECM and APP sensor

      : Repair open circuit or short to ground or short to power in harness or connectors.

  4. CHECK APP SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between APP sensor terminal 3 and ECM terminal 100. Refer to WIRING DIAGRAM .

      Continuity should exist  .

    4. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  6.

    NG: GO TO 5.

  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E108, M15
    • Harness for open or short between ECM and APP sensor

      : Repair open circuit or short to ground or short to power in harness or connectors.

  6. CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between ECM terminal 97 and APP sensor terminal 5. 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  8.

    NG: GO TO 7.

  7. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E108, M15
    • Harness for open or short between ECM and APP sensor

      : Repair open circuit or short to ground or short to power in harness or connectors.

  8. CHECK APP SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO  10.

    NG: GO TO 9.

  9. REPLACE ACCELERATOR PEDAL ASSEMBLY 
    1. Replace accelerator pedal assembly.
    2. Perform "ACCELERATOR PEDAL RELEASED POSITION LEARNING ".
    3. Perform "THROTTLE VALVE CLOSED POSITION LEARNING ".
    4. Perform "IDLE AIR VOLUME LEARNING ".

      : INSPECTION END 

  10. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

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