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Home >> Nissan-Datsun >> 2009 >> Maxima S >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1225 To P2A03 >> P2138 App Sensor >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection E9. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connection.

  2. CHECK SENSOR POWER SUPPLY CIRCUIT
    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 SPECIFICATION

      APP sensor Ground Voltage (V)
      Connector Terminal
      E40 5 Ground Approx. 5
      Fig 1: Checking Voltage Between APP Sensor Harness Connector And Ground
      G05869959Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 3.

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

  3. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I
    1. Turn ignition switch ON.
    2. Check the voltage between APP sensor harness connector and ground.
      VOLTAGE SPECIFICATION

      APP sensor Ground Voltage (V)
      Connector Terminal
      E40 6 Ground Approx. 5
      Fig 2: Checking Voltage Between APP Sensor Harness Connector And Ground
      G05869960Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 7.

    NO: GO TO 4.

  4. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between APP sensor harness connector and ECM harness connector.
      CONTINUITY CHART

      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      E40 6 E10 87 Existed

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: Repair open circuit.

  5. CHECK SENSOR POWER SUPPLY CIRCUIT

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

    ECM CONNECTOR TERMINALS REFERENCE CHART

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F13 72 Refrigerant pressure sensor E219 1
    76 CKP sensor (POS) F30 1
    E10 87 APP sensor E40 6
    91 EVAP control system pressure sensor B41 3

    Is the inspection result normal? 

    YES: GO TO 6.

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

  6. CHECK COMPONENTS

    Check the following.

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: Replace malfunctioning components.

  7. 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.
      CONTINUITY CHART

      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      E40 4 E10 84 Existed
      2 100
    4. 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 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check the continuity between APP sensor harness connector and ECM harness connector.
      CONTINUITY CHART

      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      E40 3 E10 81 Existed
      1 82
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

    YES: GO TO 9.

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

  9. CHECK APP SENSOR

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: GO TO 10.

  10. REPLACE ACCELERATOR PEDAL ASSEMBLY
    1. Replace accelerator pedal assembly.
    2. Refer to "SPECIAL REPAIR REQUIREMENT ".

    : INSPECTION END

  11. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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