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Home >> Infiniti >> 2024 >> QX80 Premium Select, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (4 Of 4) >> Engine (ECM) >> DTC P2123: App Sensor >> DTC Diagnosis Procedure

DTC 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
      E213
      (With ICC)      		 4

    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 E20 151 Existed
      E213
      (With ICC)      		 5
    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 E20 150 Existed
      E213
      (With ICC)      		 6
    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 . Is the inspection result normal?

    YES>>

    GO TO 9.

    NO>>

    GO TO 8.

  8. REPLACE ACCELERATOR PEDAL ASSEMBLY 

    Replace accelerator pedal assembly. Refer to ACCELERATOR PEDAL ASSEMBLY : Removal and Installation . (Without distance control assist system) or Refer to ACCELERATOR PEDAL ASSEMBLY : Removal and Installation . (With distance control assist system)

    >>

    INSPECTION END

  9. CHECK INTERMITTENT INCIDENT 

    Refer to Inspection .

    >>

    INSPECTION END

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