Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Nissan Titan. 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 ground three screws on the body.
  
  Fig 1: Locating Ground Screws
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Refer to GROUND INSPECTION .
OK or NG
1. OK: GO TO 2.
2. NG: Repair or replace ground connections.
CHECK PSP SENSOR POWER SUPPLY CIRCUIT
1. Disconnect PSP sensor harness connector.
2. Turn ignition switch ON.
  
  Fig 2: Disconnecting Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between PSP sensor terminal 1 and ground with CONSULT-II or tester.
  1. Voltage: Approximately 5V
OK or NG
1. OK: GO TO 3.
2. NG: Repair harness or connectors.
Fig 3: Checking Voltage
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK PSP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between PSP sensor terminal 3 and ECM terminal 67.
  Refer to WIRING DIAGRAM .
  1. Continuity should exist.
4. Also check harness for short to ground or short to power.
OK or NG
1. OK: GO TO 4.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminal 12 and PSP sensor terminal 2.
  1. Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 5.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK PSP SENSOR
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 6.
2. NG: Replace PSP sensor.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. INSPECTION END