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Home >> Infiniti >> 2013 >> M56 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1087 To P2542 >> DTC P2138: App Sensor >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT 
    1. Disconnect accelerator pedal position (APP) sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between APP sensor harness connector and ground.
      APP sensor Ground Voltage (V)
      Connector Terminal
      M9 (Without ICC) 5 Ground Approx. 5
      M153 (With ICC) 6

      Is the inspection result normal? 

      YES: GO TO  3.

      NO: GO TO 2.

  2. DETECT MALFUNCTIONING PART 

    Check the following.

    • Loose or poor connection for each connector and harness
    • Harness for open or short between ECM and APP sensor

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

  3. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I 
    1. Turn ignition switch ON.
    2. Check the voltage between APP sensor harness connector and ground.
      APP sensor Ground Voltage (V)
      Connector Terminal
      M9 (Without ICC) 6 Ground Approx. 5
      M153 (With ICC) 3

      Is the inspection result normal? 

      YES: GO TO  8.

      NO: GO TO 4.

  4. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between APP sensor harness connector and ECM harness connector.
      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      M9 (Without ICC) 6 M160 131 Existed
      M153 (With ICC) 3

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 5.

  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness for open or short between ECM and accelerator pedal position sensor
    • Loose or poor connection for each connector and harness

      : Repair open circuit.

  6. CHECK SENSOR POWER SUPPLY CIRCUIT 

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

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F111 76 CKP sensor F2 1
    77 Camshaft position sensor (bank 1) F84 1
    M160 133 Battery current sensor E21 1
    133 EVAP control system pressure sensor B73 3
    133 Refrigerant pressure sensor E77 3
    137 APP sensor 1 (Without ICC) M9 5
    137 APP sensor 1 (With ICC) M153 6
    131 APP sensor 2 (Without ICC) M9 6
    131 APP sensor 2 (With ICC) M153 3

    Is the inspection result normal? 

    YES: GO TO 7.

    NO: Repair short to ground or short to power in harness or connectors.

  7. CHECK COMPONENTS 

    Check the following.

  8. CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between APP sensor harness connector and ECM harness connector.
      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      M9 (Without ICC) 4 M160 140 Existed
      2 129
      M153 (With ICC) 5 M160 140 Existed
      2 129
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  10.

      NO: GO TO 9.

  9. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness for open or short between ECM and accelerator pedal position sensor
    • Loose or poor connection for each connector and harness

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

  10. CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check the continuity between APP sensor harness connector and ECM harness connector.
      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      M9 (Without ICC) 3 M160 136 Existed
      1 126
      M153 (With ICC) 4 M160 136 Existed
      1 126
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  12.

      NO: GO TO 11.

  11. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness for open or short between ECM and accelerator pedal position sensor
    • Loose or poor connection for each connector and harness

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

  12. CHECK APP SENSOR 

    Refer to "COMPONENT INSPECTION (ACCELERATOR PEDAL POSITION SENSOR) ".

    Is the inspection result normal? 

    YES: GO TO  14.

    NO: GO TO 13.

  13. REPLACE ACCELERATOR PEDAL ASSEMBLY 

    Replace accelerator pedal assembly.

    Refer to "MODELS WITHOUT DISTANCE CONTROL ASSIST SYSTEM: REMOVAL AND INSTALLATION " (Without distance control assist system).

    Refer to "MODELS WITH DISTANCE CONTROL ASSIST SYSTEM: REMOVAL AND INSTALLATION " (With distance control assist system).

    : INSPECTION END

  14. CHECK INTERMITTENT INCIDENT 

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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