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Home › Nissan-Datsun › 2011 › Quest SL › Repair and Diagnosis › Engine Performance › System › Engine Control System - DTCS P1550 To P2A03 › DTC P2138: App Sensor › Diagnosis Procedure

Diagnosis Procedure

  1. 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.
      TERMINAL VOLTAGE REFERENCE CHART

      APP sensor Ground Voltage (V)
      Connector Terminal
      E110 4 Ground Approx. 5

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair open circuit, short to ground or short to power in harness or connectors.

  2. CHECK APP SENSOR 2 POWER SUPPLY
    1. Turn ignition switch ON.
    2. Check the voltage between APP sensor harness connector and ground.
      TERMINAL VOLTAGE REFERENCE CHART

      APP sensor Ground Voltage (V)
      Connector Terminal
      E110 5 Ground Approx. 5

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 3.

  3. CHECK APP SENSOR 2 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.
      TERMINAL CONTINUITY REFERENCE CHART

      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      E110 5 E16 103 Existed

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Repair open circuit.

  4. CHECK SENSOR POWER SUPPLY CIRCUIT

    Check harness for short to power and short to ground, between the following terminals.

    CONNECTOR TERMINAL REFERENCE CHART

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F8 96 Refrigerant pressure sensor E300 1
    54 CKP sensor (POS) F20 1
    E16 103 APP sensor E110 5
    107 EVAP control system pressure sensor B22 3

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: Repair short to ground or short to power in harness or connectors.

  5. CHECK COMPONENTS

    Check the following.

  6. CHECK APP SENSOR 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.
      TERMINAL CONTINUITY REFERENCE CHART

      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      E110 2 E16 100 Existed
      1 116
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 7.

      NO: Repair open circuit, short to ground or short to power in harness or connectors.

  7. CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check the continuity between APP sensor harness connector and ECM harness connector.
      TERMINAL CONTINUITY REFERENCE CHART

      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      E110 3 E16 97 Existed
      6 98
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 8.

      NO: Repair open circuit, short to ground or short to power in harness or connectors.

  8. CHECK APP SENSOR

    Check APP sensor. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

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

    NO: Replace accelerator pedal assembly. Refer to "EXPLODED VIEW ".

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