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Home >> Infiniti >> 2013 >> FX37 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1089 To P2138 >> DTC P2138: App Sensor >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK GROUND CONNECTION 
    1. Turn ignition switch OFF.
    2. Check ground connection M95. Refer to "CIRCUIT INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connection.

  2. CHECK APP 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
      E112(1) 5 Ground Approx. 5
      E116(2) 5
      (1) Without ICC
      (2) With ICC

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: GO TO 3.

  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M6, E106
    • Harness for open or short between ECM and accelerator pedal position sensor

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

  4. 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
      E112(1) 6 Ground Approx. 5
      E116(2) 3
      (1) Without ICC
      (2) With ICC

      Is the inspection result normal? 

      YES: GO TO  9.

      NO: GO TO 5.

  5. 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
      E112(1) 6 M164 103 Existed
      E116(2) 3
      (1) Without ICC
      (2) With ICC

      Is the inspection result normal? 

      YES: GO TO  7.

      NO: GO TO 6.

  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M6, E106
    • Harness for open or short between ECM and accelerator pedal position sensor

      : Repair open circuit.

  7. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III 

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

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F112 46 CKP sensor (POS) F2 1
    M164 103 APP sensor E112(1) 6
    E116(2) 3
    107 EVAP control system pressure sensor B30 3
    Refrigerant pressure sensor E77 3
    (1) Without ICC
    (2) With ICC

    Is the inspection result normal? 

    YES: GO TO 8.

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

  8. CHECK COMPONENTS 

    Check the following.

  9. 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
      E112(1) 4 M164 100 Existed
      2 104
      E116(2) 1 M164 100
      2 104
      (1) Without ICC
      (2) With ICC
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  11.

      NO: GO TO 10.

  10. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M6, E106
    • Harness for open or short between ECM and accelerator pedal position sensor

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

  11. 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
      E112(1) 3 M164 97 Existed
      1 98
      E116(2) 4 M164 97
      6 98
      (1) Without ICC
      (2) With ICC
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  13.

      NO: GO TO 12.

  12. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M6, E106
    • Harness for open or short between ECM and accelerator pedal position sensor

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

  13. CHECK APP SENSOR 

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO  15.

    NO: GO TO 14.

  14. REPLACE ACCELERATOR PEDAL ASSEMBLY 
    1. Replace accelerator pedal assembly.
    2. Go to "SPECIAL REPAIR REQUIREMENT ".

      : INSPECTION END

  15. CHECK INTERMITTENT INCIDENT 

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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