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Home >> Infiniti >> 2016 >> Q50 Base, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 123 (Hybrid Motor System (Diagnostic Trouble Codes (DTCS) P2122-P31FF And Circuit Diagnosis) (Hybrid)) >> DTC / Circuit Diagnosis >> DTC P2127, P2128: App Sensor >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different variant/trim than selected.

  1. CHECK DTC PRIORITY

    If DTC P2127 or P2128 is displayed with DTC P3157, first perform the confirmation procedure (trouble diagnosis) for DTC P3157.

    Is applicable DTC detected?

    YES 

    Perform diagnosis of applicable. Refer to DTC INDEX .

    NO 

    GO TO STEP 2  .

  2. CHECK APP SENSOR 2 POWER SUPPLY - 1

    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 terminals.
      APP sensor Voltage
      (Approx.)
      Connector + -
      Terminal
      M124 10 11 5 V

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    GO TO STEP 3  .

  3. CHECK APP SENSOR 2 POWER SUPPLY - 2

    Check the voltage between APP sensor harness connector and ground.

    + - Voltage
    (Approx.)
    APP sensor
    Connector Terminal
    M124 10 Ground 5 V

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    GO TO STEP 4  .

  4. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect HPCM harness connector.
    3. Check the continuity between APP sensor harness connector and HPCM harness connector.
      + - Continuity
      APP sensor HPCM
      Connector Terminal Connector Terminal
      M124 10 B14 31 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    Perform trouble diagnosis for power supply circuit.

    NO 

    Repair or replace error-detected parts.

  5. CHECK APP SENSOR 2 GROUND CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect HPCM harness connector.
    3. Check the continuity between APP sensor harness connector and HPCM harness connector.
      + - Continuity
      APP sensor HPCM
      Connector Terminal Connector Terminal
      M124 11 B14 27 Existed

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    Repair or replace error-detected parts.

  6. CHECK HPCM GROUND CIRCUIT

    Check the continuity between HPCM harness connector and ground.

    + - Continuity
    HPCM
    Connector Terminal
    B14 20 Ground Existed
    39
    40
    B16 65

    Is the inspection result normal?

    YES 

    Perform INTERMITTENT INCIDENT .

    NO 

    Repair or replace error-detected parts.

  7. CHECK APP SENSOR 2 SIGNAL CIRCUIT

    1. Check the continuity between APP sensor harness connector and HPCM harness connector.
      + - Continuity
      APP sensor HPCM
      Connector Terminal Connector Terminal
      M124 12 B14 28 Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 8  .

    NO 

    Repair or replace error-detected parts.

  8. CHECK APP SENSOR 2

    Refer to COMPONENT INSPECTION (ACCELERATOR PEDAL POSITION SENSOR) .

    Is the inspection result normal?

    YES 

    Perform INTERMITTENT INCIDENT .

    NO 

    Replace accelerator pedal. Refer to REMOVAL AND INSTALLATION .

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