Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan 350Z. 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. Refer to "GROUND INSPECTION ".
  
  Fig 1: Loosen & Retighten Three Ground Screws On The Body
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 2.
- NG: Repair or replace ground connections.
CHECK PSP SENSOR POWER SUPPLY CIRCUIT
1. Disconnect power steering pressure (PNP) sensor harness connector.
2. Turn ignition switch ON.
  
  Fig 2: Locating Power Steering Pressure Sensor
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between PSP sensor terminal 1 and ground with CONSULT-II or tester.
  - Voltage: Approximately 5V
OK or NG
- OK: GO TO 3.
- NG: Repair open circuit or short to ground or short to power in harness or connectors.
Fig 3: PSP Sensor Terminal 1 & Ground Voltage Test
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 .
  - Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
- OK: GO TO 4.
- 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.
  - Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
- OK: GO TO 5.
- 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
- OK: GO TO 6.
- NG: Replace PNP sensor.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
- : INSPECTION END