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 "ENGINE 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 INSTALLATION ".

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 for CKP sensor (POS) and WIRING DIAGRAM for CMP sensor (PHASE).
- : INSPECTION END