Diagnostic Procedure

CHECK OIL PRESSURE WARNING LAMP
1. Start engine.
2. Check oil pressure warning lamp and confirm it is not illuminated.
OK or NG
- OK: GO TO 2.
- KG: Go to OIL PRESSURE CHECK .
Fig 1: Identifying Oil Pressure Warning Lamp
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK INTAKE VALVE TIMING CONTROL SOLENOID VALVE
Refer to COMPONENT INSPECTION .

OK or NG
- OK: GO TO 3.
- NG: Replace intake valve timing control solenoid valve.
CHECK CRANKSHAFT POSITION SENSOR (POS)
Refer to COMPONENT INSPECTION .

OK or NG
- OK: GO TO 4.
- NG: Replace crankshaft position sensor (POS).
CHECK CAMSHAFT POSITION SENSOR (PHASE)
Refer to COMPONENT INSPECTION .

OK or NG
- OK: GO TO 5.
- NG: Replace camshaft position sensor (PHASE).
CHECK CAMSHAFT (INTAKE)
Check the following.
- Accumulation of debris to the signal plate of camshaft rear end
- Chipping signal plate of camshaft rear end
OK or NG
- OK: GO TO 6.
- NG: Remove debris and clean the signal plate of camshaft rear end or replace camshaft.
Fig 2: Checking Camshaft (Intake)
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK TIMING CHAIN INSTALLATION
Check service records for any recent repairs that may cause timing chain misaligned.

OK or NG
- OK: Check timing chain installation. Refer to TIMING CHAIN .
- NG: GO TO 7.
CHECK LUBRICATION CIRCUIT
Refer to INSPECTION AFTER REMOVAL .

OK or NG
- OK: GO TO 8.
- NG: Clean lubrication line.
CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

For wiring diagram, refer to WIRING DIAGRAM - POS for CKP sensor (POS) and WIRING DIAGRAM for CMP sensor (PHASE).
- : INSPECTION END