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Home >> Infiniti >> 2024 >> Q50 Luxe, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (6 Of 7) >> Engine (ECM) >> P2123 App Sensor >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK DTC PRIORITY 

    If DTC P2123 is displayed with DTC P0643, first perform the confirmation procedure (trouble diagnosis) for DTC P0643.

    Is applicable DTC detected?

    YES>>

    Perform diagnosis of applicable. Refer to DTC Description .

    NO>>

    GO TO 2.

  2. CHECK APP SENSOR 1 POWER SUPPLY 
    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 (V)
      APP sensor
      Connector Terminal
      M124 4 Ground Approx. 5

    Is the inspection result normal?

    YES>>

    GO TO 4.

    NO>>

    GO TO 3.

  3. CHECK APP SENSOR 1 POWER SUPPLY 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
      APP sensor ECM
      Connector Terminal Connector Terminal
      M124 4 E152 198 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    Perform the trouble diagnosis for ECM power supply circuit. Refer to Diagnosis Procedure .

    NO>>

    Repair or replace error-detected parts.

  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
      APP sensor ECM
      Connector Terminal Connector Terminal
      M124 5 E152 203 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    GO TO 5.

    NO>>

    Repair or replace error-detected parts.

  5. CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check the continuity between APP sensor harness connector and ECM harness connector.
      + - Continuity
      APP sensor ECM
      Connector Terminal Connector Terminal
      M124 6 E152 202 Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    GO TO 6.

    NO>>

    Repair or replace error-detected parts.

  6. CHECK APP SENSOR 

    Refer to Component Inspection . Is the inspection result normal?

    YES>>

    INSPECTION END

    NO>>

    Replace accelerator pedal assembly. Refer to ACCELERATOR CONTROL SYSTEM : Removal and Installation .

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