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Home › Infiniti › 2004 › G35 x › Repair and Diagnosis › Engine Performance › System › 2004 - Engine Control System - Sedan › Trouble Diagnosis › DTC P2138: App Sensor › Diagnostic Procedure

Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten two ground screws on the body. Refer to Ground Inspection .
    Fig 1: Loosening/Tightening Ground Screws On Body
    G00733047Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 2.
    2. NG: Repair or replace ground connections.
  2. CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT 
    1. Disconnect accelerator pedal position (APP) sensor harness connector.
    2. Turn ignition switch ON.
      Fig 2: Locating Accelerator Pedal Position (APP) Sensor Harness Connector
      G00733048Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between APP sensor terminal 6 and ground with CONSULT-II or tester.
      1. Voltage: Approximately 5V 

    OK or NG

    1. OK: GO TO  4.
    2. NG: GO TO 3.
    Fig 3: Checking Voltage Between APP Sensor Terminal 6 And Ground
    G00733049Courtesy of NISSAN MOTOR CO., U.S.A.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E10, F1
    • Harness for open or short between ECM and accelerator pedal position sensor.
      1. : Repair open circuit or short to ground or short to power in harness or connectors.
  4. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I 

    Check voltage between APP sensor terminal 4 and ground with CONSULT-II or tester.

    1. Voltage: Approximately 5V 

    OK or NG

    1. OK: GO TO  10.
    2. NG: GO TO 5.
    Fig 4: Checking Voltage Between APP Sensor Terminal 4 And Ground
    G00733050Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between APP sensor terminal 4 and ECM terminal 91.

      Refer to Wiring Diagram.

      1. Continuity should exist. 

    OK or NG

    1. OK: GO TO  7.
    2. NG: GO TO 6.
  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E10, F1
    • Harness for open between ECM and accelerator pedal position sensor.
      1. : Repair or replace open circuit.
  7. CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III 

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

    Fig 5: ECM Terminals & Sensor Terminals Reference Table
    G00733051Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 8.
    2. NG: Repair short to ground or short to power in harness or connectors.
  8. CHECK THROTTLE POSITION SENSOR 

    Refer to Component Inspection .

    OK or NG

    1. OK: GO TO  16.
    2. NG: GO TO 9.
  9. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR 
    1. Replace the electric throttle control actuator.
    2. Perform Throttle Valve Closed Position Learning .
    3. Perform Idle Air Volume Learning .
      1. : INSPECTION END 
  10. CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between APP sensor terminal 1 and ECM terminal 83, APP sensor terminal 3 and ECM terminal 82.

      Refer to Wiring Diagram.

      1. Continuity should exist. 
    4. Also check harness for short to ground and short to power.

    OK or NG

    1. OK: GO TO  12.
    2. NG: GO TO 11.
  11. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E10, F1
    • Harness for open or short between ECM and accelerator pedal position sensor.
      1. : Repair open circuit or short to ground or short to power in harness or connectors.
  12. CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between ECM terminal 106 and APP sensor terminal 5, ECM terminal 98 and APP sensor terminal 2.

      Refer to Wiring Diagram.

      1. Continuity should exist. 
    2. Also check harness for short to ground and short to power.

    OK or NG

    1. OK: GO TO  14.
    2. NG: GO TO 13.
  13. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E10, F1
    • Harness for open or short between ECM and accelerator pedal position sensor.
      1. : Repair open circuit or short ground or short to power in harness or connectors.
  14. CHECK APP SENSOR 

    Refer to Component Inspection .

    OK or NG

    1. OK: GO TO  16.
    2. NG: GO TO 15.
  15. REPLACE ACCELERATOR PEDAL ASSEMBLY 
    1. Replace accelerator pedal assembly.
    2. Perform Accelerator Pedal Released Position Learning 
    3. Perform Throttle Valve Closed Position Learning 
    4. Perform Idle Air Volume Learning 
      1. : INSPECTION END 
  16. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    1. : INSPECTION END 
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