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Home >> Infiniti >> 2011 >> M37 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1233 To P2A03 >> DTC P2122, P2123: 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.

  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 1 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
      (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  6.

      NO: GO TO 5 (With ICC).

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

  5. 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.

  6. 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) 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  8.

      NO: GO TO 7 (With ICC).

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

  7. 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.

  8. CHECK APP SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO  10.

    NO: GO TO 9.

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

      INSPECTION END

  10. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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