Diagnosis Procedure

1. 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.

   NG: GO TO "INSPECTION ".

   Fig 1: Checking Oil Pressure Warning Lamp

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. 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. Refer to "REMOVAL AND INSTALLATION ".

3. CHECK CRANKSHAFT POSITION SENSOR (POS)

   Refer to "COMPONENT INSPECTION ".

   OK or NG 

   OK: GO TO 4.

   NG: Replace crankshaft position sensor (POS). Refer to "DISASSEMBLY AND ASSEMBLY ".

4. CHECK CAMSHAFT POSITION SENSOR (PHASE)

   Refer to "COMPONENT INSPECTION ".

   OK or NG 

   OK: GO TO 5.

   NG: Replace camshaft position sensor (PHASE). Refer to "REMOVAL AND INSTALLATION ".

5. CHECK CAMSHAFT (INTAKE)

   Check the following.

   • Accumulation of debris to the signal plate of camshaft (1) 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. Refer to "REMOVAL AND INSTALLATION ".

   Fig 2: View Of Camshaft

   Courtesy of NISSAN MOTOR CO., U.S.A.
6. CHECK TIMING CHAIN INSTALLATION

   Check service records for any recent repairs that may cause timing chain misaligned.

   Are there any service records that may cause timing chain misaligned? 

   Yes or No 

   Yes: Check timing chain installation. Refer to TIMING CHAIN .

   No: GO TO 7.

7. CHECK LUBRICATION CIRCUIT

   Refer to "INSPECTION AFTER INSTALLATION ".

   OK or NG 

   OK: GO TO 8.

   NG: Clean lubrication line.

8. 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