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Home >> Infiniti >> 2012 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1550 To P2A03 >> DTC P2122, P2123: App Sensor >> Diagnosis Procedure

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
    E110
    (Without ICC)    		 2 Ground Approx. 5
    E67
    (With ICC)    		 12

    Is the inspection result normal? 

    YES: GO TO  3.

    NO: GO TO 2.

  2. DETECT MALFUNCTIONING PART

    Check the following.

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

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

  3. 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
      E110
      (Without ICC)      		 4 E80 140 Existed
      E67
      (With ICC)      		 11
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  5.

    NO: GO TO 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

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

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

  5. 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
      E110
      (Without ICC)      		 3 E80 136 Existed
      E67
      (With ICC)      		 10
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  7.

    NO: GO TO 6.

  6. 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.

  7. CHECK APP SENSOR

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

    Is the inspection result normal? 

    YES: GO TO  9.

    NO: GO TO 8.

  8. REPLACE ACCELERATOR PEDAL ASSEMBLY

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

    : INSPECTION END

  9. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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