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Home >> Infiniti >> 2011 >> M37 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1233 To P2A03 >> 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 Ground Inspection in "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.
      VOLTAGE REFERENCE

      APP sensor Ground Voltage (V)
      Connector Terminal
      M153(1)
      M9(2)      		 6(1)
      5(2)      		 Ground Approx. 5
      (1) With ICC
      (2) Without ICC

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: GO TO 3 (With ICC).

      NO: Repair open circuit, short to ground or short to power in harness or connectors (Without ICC).

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors M150, M151
    • 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.
      VOLTAGE REFERENCE

      APP sensor Ground Voltage (V)
      Connector Terminal
      M153(1)
      M9(2)      		 3(1)
      6(2)      		 Ground Approx. 5
      (1) With ICC
      (2) Without 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.
      CONTINUITY REFERENCE

      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      M153(1)
      M9(2)      		 3(1)
      6(2)      		 M107 103 Existed
      (1) With ICC
      (2) Without ICC

      Is the inspection result normal? 

      YES: GO TO  7.

      NO: GO TO 6 (With ICC).

      NO: Repair open circuit, short to ground or short to power in harness or connectors (Without ICC).

  6. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors M105, M151
    • 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.

  7. CHECK SENSOR POWER SUPPLY CIRCUIT

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

    TERMINAL REFERENCE

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F101 46 CKP sensor (POS) F2 1
    F102 64 CMP sensor (PHASE) (bank 2) F18 1
    Battery current sensor E21
    M107 103 APP sensor M153(1)
    M9(2)    		 3(1)
    6(2)
    107 EVAP control system pressure sensor B73 3
    Refrigerant pressure sensor E77 3
    (1) With ICC
    (2) Without 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.
      CONTINUITY REFERENCE

      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      M153(1)
      M9(2)      		 5(1)
      4(2)      		 M107 100 Existed
      2 104
      (1) With ICC
      (2) Without 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 (With ICC).

      NO: Repair open circuit, short to ground or short to power in harness or connectors (Without ICC).

  10. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors M150, M151
    • 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.
      CONTINUITY REFERENCE

      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      M153(1)
      M9(2)      		 4(1)
      3(2)      		 M107 97 Existed
      1 98
      (1) With ICC
      (2) Without 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 (With ICC).

      NO: Repair open circuit, short to ground or short to power in harness or connectors (Without ICC).

  12. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors M150, M151
    • 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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