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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) >> P2128 App Sensor >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK APP SENSOR 2 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 10 Ground Approx. 5

    Is the inspection result normal?

    YES>>

    GO TO 4.

    NO>>

    GO TO 2.

  2. CHECK APP SENSOR 2 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 10 E152 194 Existed

    Is the inspection result normal?

    YES>>

    GO TO 3.

    NO>>

    Repair or replace error-detected parts.

  3. CHECK SENSOR POWER SUPPLY 2 CIRCUIT 

    Refer to Diagnosis Procedure . 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 2 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 11 E152 196 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 2 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 12 E152 195 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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