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Home >> Infiniti >> 2012 >> FX35 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1211 Through 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 ACCELERATOR PEDAL POSITION (APP) SENSOR 1 POWER SUPPLY CIRCUIT
    1. Disconnect 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 (Without ICC) 5 Ground Approx. 5
      E116 (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 APP 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.
      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      E112 (Without ICC) 4 M107 100 Existed
      E116 (With ICC) 1
    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.

  5. DETECT MALFUNCTIONING PART

    Check the Following:

    • Harness connectors M6, E106
    • Harness for open or short between ECM and APP 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.
      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      E112 (Without ICC) 3 M107 97 Existed
      E116 (With ICC) 4
    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.

  7. DETECT MALFUNCTIONING PART

    Check the Following:

    • Harness connectors M6, E106
    • Harness for open or short between ECM and APP 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

    Replace accelerator pedal assembly. Refer to "MODELS WITHOUT DISTANCE CONTROL ASSIST SYSTEM: REMOVAL AND INSTALLATION " (without distance control assist) or "MODELS WITH DISTANCE CONTROL ASSIST SYSTEM: REMOVAL AND INSTALLATION " (without distance control assist).

    : INSPECTION END

  10. CHECK INTERMITTENT INCIDENT

    Perform "INTERMITTENT INCIDENT ".

    : INSPECTION END

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