FixVault
Home › Nissan-Datsun › 2002 › Sentra SE-R, Standard › Repair and Diagnosis › External Pages › Different car › Section 579 (Engine Control System - Coupe) › DTC P2122, P2123: App Sensor › Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.
  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: Checking Ground Connections
      G02334115Courtesy 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
      G02334116Courtesy 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 & Ground
    G02334117Courtesy 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 APP sensor
      1. Repair open circuit or short to ground or short to power in harness or connectors.
  4. CHECK APP SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between 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  6
    2. NG: GO TO  5.
  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E10, F1
    • Harness for open or short between ECM and APP sensor
      1. Repair open circuit or short to ground or short to power in harness or connectors.
  6. CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between ECM terminal 106 and APP sensor terminal 5. 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  8
    2. NG: GO TO  7.
  7. DETECT MALFUNCTIONING PART 

    Check the following.

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

    Refer to Component Inspection .

    OK or NG 

    1. OK: GO TO  10.
    2. NG: GO TO  9.
  9. 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 
  10. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    1. INSPECTION END 
About FixVault