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Home >> Nissan-Datsun >> 2008 >> Maxima SL >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS P1148 To P2A03 >> DTC P2127, P2128 APR Sensor >> Diagnostic Procedure
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Diagnostic Procedure

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

      Refer to "GROUND INSPECTION ."

      Fig 1: Checking Ground Connections
      G04915248Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  2.

    NG: Repair or replace ground connections.

  2. CHECK APR SENSOR 2 POWER SUPPLY CIRCUIT-I 
    1. Disconnect accelerator pedal position (APR) sensor harness connector.
    2. Turn ignition switch ON.
      Fig 2: Identifying Accelerator Pedal Position (APP) Sensor Harness Connector And Hood Opener Handle
      G04915695Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between APR sensor terminal 1 and ground with CONSULT-III or tester.

      Voltage: Approximately 5V 

      4. Fig 3: Checking Voltage Between APP Sensor Terminal 1 And Ground With CONSULT-III Or Tester
      G04895121Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  8.

    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  5.

    NG: GO TO  4.

  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E25, M90
    • Harness for open or short between ECM and accelerator pedal position sensor.

      • >> Repair open circuit.

  5. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-MI 

    Check harness for short to power and short to ground, between the following terminals.

    APP SENSOR SPECIFICATION

    ECM terminal Sensor terminal Reference
    91 APP sensor terminal 1 WIRING DIAGRAM 
    47 Electric throttle control actuator terminal 1 WIRING DIAGRAM 

    OK or NG 

    OK: GO TO  6.

    NG: Repair short to ground or short to power in harness or connectors.

  6. CHECK THROTTLE POSITION SENSOR 

    Refer to "COMPONENT INSPECTION ."

    OK or NG 

    OK: GO TO  14.

    NG: GO TO  7.

  7. REPLACE ELECTORIC THROTTLE CONTOROL ACTUATOR 
    1. Replace the electric throttle control actuator.
    2. Perform "THROTTLE VALVE CLOSED POSITION LEARNING ."
    3. Perform "IDLE AIR VOLUME LEARNING ."

      4. >> INSPECTION END 

  8. 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 ECM terminal 83 and APP sensor terminal 5.

      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  10.

    NG: GO TO  9.

  9. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E25, M90
    • Harness for open or short between accelerator pedal position sensor and ECM

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

  10. 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  12.

    NG: GO TO  11.

  11. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E25, M90
    • Harness for open or short between accelerator pedal position sensor and ECM

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

  12. CHECK APR SENSOR 

    Refer to "COMPONENT INSPECTION ."

    OK or NG 

    OK: GO TO  14.

    NG: GO TO  13.

  13. 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  ."

      5. >> INSPECTION END 

  14. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ."

    >> INSPECTION END 

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