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Home › Nissan-Datsun › 2003 › Sentra SE-R, Automatic › Repair and Diagnosis › External Pages › Different car › Section 588 (Engine Control System - Coupe) › DTC P1229: Sensor Power Supply › 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: Identifying Two Ground Screws On Body (DTC P01229)
      G02333902Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  2.
    2. NG: Repair or replace ground connections.
  2. CHECK ACCELERATOR PEDAL POSITION 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
      G02333903Courtesy 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  5.
    2. NG: GO TO  3.
    Fig 3: Checking Accelerator Pedal Position Sensor 1 Power Supply Circuit
    G02333904Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK SENSOR POWER SUPPLY CIRCUITS 

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

    CONDITION

    ECM terminal Sensor terminal Reference
    48 EVAP control system pressure sensor terminal 3 Wiring Diagram - PRE/SE 
    49 Refrigerant pressure sensor terminal 1 Wiring Diagram - RP/SEN 
    68 PSP sensor terminal 1 Wiring Diagram - PS/SEN 
    90 APP sensor terminal 6 Wiring Diagram - SEN/PW 

    OK or NG 

    1. OK: GO TO  4.
    2. NG: Repair short to ground or short to power in harness or connectors.
  4. CHECK COMPONENTS 

    Check the following.

    OK or NG 

    1. OK: GO TO  7.
    2. NG: Replace malfunctioning component.
  5. CHECK APP SENSOR 

    Refer to Component Inspection .

    OK or NG 

    1. OK: GO TO  7.
    2. NG: GO TO  6.
  6. 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 
  7. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    1. INSPECTION END 
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