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Home >> Infiniti >> 2016 >> QX50 AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnostic Trouble Codes (DTCS) (P0447-P2138) >> DTC/Circuit Diagnosis >> DTC P2127, P2128: Accelerator Pedal Position (App) Sensor 2 Circuit Low/High Input >> Diagnosis Procedure >> Diagnostic Test
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Diagnostic Test

  1. CHECK GROUND CONNECTION

    1. Turn ignition switch OFF.
    2. Check ground connection M95. Refer to Ground Inspection in CIRCUIT INSPECTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    Repair or replace ground connection.

  2. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I

    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.
      APP sensor Ground Voltage (V)
      Connector Terminal
      E112
      (Without ICC)      		 6 Ground Approx. 5
      E116
      (With ICC)      		 3

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    GO TO STEP 3  .

  3. 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.
      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      E112
      (Without ICC)      		 6 M107 103 Existed
      E116
      (With ICC)      		 3

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    GO TO STEP 4  .

  4. DETECT MALFUNCTIONING PART

    Check the following:

    • Harness connectors M6, E106
    • Harness for open or short between ECM and accelerator pedal position sensor

    Repair open circuit.

  5. CHECK SENSOR POWER SUPPLY CIRCUIT

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

    ECM Sensor
    Connector Terminal Name Connector Terminal
    F101 45 Brake booster pressure sensor E48 1
    46 CKP sensor (POS) F2 1
    M107 103 APP sensor E112
    (Without ICC)    		 6
    E116
    (With ICC)    		 3
    107 EVAP control system pressure sensor B252 3
    Refrigerant pressure sensor E77 3

    Is the inspection result normal?

    YES 

    GO TO STEP 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 STEP 13  .

    NO 

    Replace malfunctioning component.

  7. 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.
      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      E112
      (Without ICC)
      E116
      (With ICC)      		 2 M107 104 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 9  .

    NO 

    GO TO STEP 8  .

  8. DETECT MALFUNCTIONING PART

    Check the following:

    • Harness connectors M6, E106
    • Harness for open or short between ECM and accelerator pedal position sensor

    Repair open circuit, short to ground or short to power in harness or connectors.

  9. CHECK APP SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

    1. Check the continuity between APP sensor harness connector and ECM harness connector.
      APP sensor ECM Continuity
      Connector Terminal Connector Terminal
      E112
      (Without ICC)      		 1 M107 98 Existed
      E116
      (With ICC)      		 6
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 11  .

    NO 

    GO TO STEP 10  .

  10. DETECT MALFUNCTIONING PART

    Check the following:

    • Harness connectors M6, E106
    • Harness for open or short between ECM and accelerator pedal position sensor

    Repair open circuit, short to ground or short to power in harness or connectors.

  11. CHECK APP SENSOR

    Refer to COMPONENT INSPECTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 13  .

    NO 

    GO TO STEP 12  .

  12. REPLACE ACCELERATOR PEDAL ASSEMBLY

    1. Replace accelerator pedal assembly. Refer to REMOVAL AND INSTALLATION .
    2. Go to SPECIAL REPAIR REQUIREMENT .

    INSPECTION END

  13. CHECK INTERMITTENT INCIDENT

    Refer to INTERMITTENT INCIDENT .

    INSPECTION END

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