Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Infiniti FX45. However, it is still accessible from the selected car via links, so may be relevant.

Check Ground Connections
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. See Figure .
  Refer to GROUND INSPECTION .
OK or NG
1. OK: go to 2.
2. NG: Repair or replace ground connections.
Check Accelerator Pedal Position Sensor 1 Power Supply Circuit
1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.
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.
Check Sensor Power Supply Circuits
Check harness for short to power and short to ground, between the following terminals.

Fig 1: Identifying Sensors Associated With ECM Terminals Likely To Have Shorts To Ground Or Power
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: go to 4.
2. NG: Repair short to ground or short to power in harness or connectors.
Check Components
Check the following.
- Mass air flow sensor. Refer to COMPONENT INSPECTION .
- EVAP control pressure sensor. Refer to COMPONENT INSPECTION .
- Refrigerant pressure sensor. Refer to REFRIGERANT PRESSURE SENSOR .
- Power steering pressure sensor.. Refer to COMPONENT INSPECTION .
OK or NG
1. OK: go to 7.
2. NG: Replace malfunctioning component.
Check APP Sensor
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: go to 7.
2. NG: go to 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
Check Intermittent Incident
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. Inspection end