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Home › Nissan-Datsun › 2005 › Pathfinder LE, RWD › Repair and Diagnosis › Engine Performance › Engine Control System › DTC P2127, P2128: App Sensor › Diagnostic Procedure

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: Tightening Ground Screws On Body
    G02432422Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: GO TO 2.
    • NG: Repair or replace ground connections.
  2. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I 
    1. Disconnect accelerator pedal position (APP) sensor harness connector.
      Fig 2: Locating Accelerator Pedal Position (APP) Sensor Harness Connector
      G02432423Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Turn ignition switch ON.
    3. Check voltage between APP sensor terminal 1 and ground with CONSULT-II or tester.
      • Voltage: Approximately 5V 
      Fig 3: Checking Voltage Between APP Sensor Connector Terminal 1 And Ground
      G02432424Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: GO TO  7.
    • NG: GO TO 3.
  3. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between APP sensor terminal 1 and ECM terminal 91.

      Refer to WIRING DIAGRAM .

      • Continuity should exist. 

    OK or NG 

    • OK: GO TO 4.
    • NG: Repair open circuit or short to ground or short to power in harness or connectors.
  4. CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT-III 

    Check the following.

    OK or NG 

    • OK: GO TO 5.
    • NG: Repair short to ground or short to power in harness or connectors.
  5. CHECK THROTTLE POSITION SENSOR 

    Refer to COMPONENT INSPECTION .

    OK or NG 

    • OK: GO TO 11.
    • NG: GO TO 6.
  6. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR 
    1. Replace electric throttle control actuator.
    2. Perform THROTTLE VALVE CLOSED POSITION LEARNING .
    3. Perform IDLE AIR VOLUME LEARNING .
      • : INSPECTION END 
  7. CHECK APP SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between APP sensor terminal 5 and ECM terminal 83.

      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 8.
    • NG: Repair open circuit or short to ground or short to power in harness or connectors.
  8. CHECK APP SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between ECM terminal 98 and APP sensor terminal 6.

      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 9.
    • NG: Repair open circuit or short to ground or short to power in harness or connectors.
  9. CHECK APP SENSOR 

    Refer to COMPONENT INSPECTION .

    OK or NG 

    • OK: GO TO 11.
    • NG: GO TO 10.
  10. 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 
  11. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    • : INSPECTION END 
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