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Home >> Nissan-Datsun >> 2014 >> Sentra SL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes & Symptom Tests) >> DTC/Circuit Diagnosis >> DTC P2138: App Sensor >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK APP SENSOR 1 POWER SUPPLY 
    1. Turn ignition switch OFF.
    2. Disconnect accelerator pedal position (APP) sensor harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between APP sensor harness connector and ground.
      + - Voltage (Approx.)
      APP sensor
      Connector Terminal
      E12 4 Ground 5.0 V

      Is the inspection result normal? 

      YES: GO TO  3.

      NO: GO TO 2.

  2. 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.
      + - Continuity
      APP sensor ECM
      Connector Terminal Connector Terminal
      E12 4 E16 122 Existed
    4. Also check harness for short to ground.

      Is the inspection result normal? 

      YES: Perform the trouble diagnosis for power supply circuit.

      NO: Repair or replace error-detected parts.

  3. CHECK APP SENSOR 2 POWER SUPPLY 

    Check the voltage between APP sensor harness connector and ground.

    + - Voltage (Approx.)
    APP sensor
    Connector Terminal
    E12 5 Ground 5.0 V

    Is the inspection result normal? 

    YES: GO TO  5.

    NO: GO TO 4.

  4. CHECK SENSOR POWER SUPPLY 2 CIRCUIT 

    Check sensor power supply 2 circuit. Refer to "DIAGNOSIS PROCEDURE ".

    Is inspection result normal? 

    YES: Perform the trouble diagnosis for power supply circuit.

    NO: Repair or replace error-detected parts.

  5. CHECK APP SENSOR 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.
      + - Continuity
      APP sensor ECM
      Connector Terminal Connector Terminal
      E12 1 E16 120 Existed
      2 127
    4. Also check harness for short to power.

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: Repair or replace error-detected parts.

  6. CHECK APP SENSOR INPUT SIGNAL CIRCUIT 
    1. Check the continuity between APP sensor harness connector and ECM harness connector.
      + - Continuity
      APP sensor ECM
      Connector Terminal Connector Terminal
      E12 3 E16 126 Existed
      6 119
    2. Also check harness for short to ground and to power.

      Is the inspection result normal? 

      YES: GO TO 7.

      NO: Repair or replace error-detected parts

  7. CHECK APP SENSOR 

    Check APP sensor. Refer to "COMPONENT INSPECTION (APP SENSOR) ".

    Is the inspection result normal? 

    YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

    NO: Replace accelerator pedal assembly. Refer to "REMOVAL AND INSTALLATION ".

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