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HOMESERVICE MANUALSNISSAN-DATSUN2024FRONTIER SL, RWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM (DTC/CIRCUIT DIAGNOSIS) (5 OF 6)DTC/CIRCUIT DIAGNOSISDTC P2123: APP SENSORDIAGNOSIS PROCEDURE
2024 Nissan-Datsun Frontier SL, RWD

Diagnosis Procedure

2024 Nissan-Datsun Frontier SL, RWDSECTION 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 DTC P0643 detected?

    >>

    Perform diagnosis for P0643. Refer to DTC Description .

    >>

    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 (Approx.)
      APP sensor
      Connector Terminal
      E20 2 Ground 5 V

    Is the inspection result normal?

    >>

    GO TO 4.

    >>

    GO TO 3.

  3. CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT 
    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
      E20 2 E16 198 Existed
    4. Also check harness for short to power and short to ground.

    Is the inspection result normal?

    >>

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

    >>

    Repair or replace error-detected parts.

  4. CHECK APP SENSOR 1 GROUND CIRCUIT 
    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
      E20 4 E16 203 Existed
    4. Also check harness for short to power.

    Is the inspection result normal?

    >>

    GO TO 5.

    >>

    Repair or replace error-detected parts.

  5. CHECK APP SENSOR INPUT SIGNAL CIRCUIT 
    1. Check the continuity between APP sensor harness connector and ECM harness connector.
      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      E20 3 E16 202 Existed
    2. Also check harness for short to power and short to ground.

    Is the inspection result normal?

    >>

    GO TO 6.

    >>

    Repair or replace error-detected parts.

  6. CHECK APP SENSOR 

    Refer to Component Inspection (Accelerator Pedal Position Sensor) .

    Is the inspection result normal?

    >>

    INSPECTION END

    >>

    Replace accelerator pedal assembly. Refer to Removal and Installation

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.