Diagnostic Procedure

CHECK STARTING SYSTEM
Turn ignition switch to START position.

Does the engine turn over?

Does the starter motor operate?

OK or NG
1. OK: GO TO 2.
2. NG: Check starting system. (Refer to STARTERS .)
RETIGHTEN GROUND SCREWS
1. Turn ignition switch OFF.
2. Loosen and retighten engine ground screws.
  1. GO TO 3.
  Fig 1: Retightening Ground Screws
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK CMP SENSOR (PHASE) POWER SUPPLY CIRCUIT
1. Disconnect camshaft position (CMP) sensor (PHASE) harness connector.
2. Turn ignition switch ON.
  
  Fig 2: Identifying Camshaft Position (CMP) Sensor
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between camshaft position sensor (PHASE) terminal 3 and ground with CONSULT-II or tester.
  Voltage: Battery voltage
4. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 5.
2. NG: GO TO 4.
  
  Fig 3: Checking Voltage Between Camshaft Position Sensor (PHASE) Terminal 3 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
DETECT MALFUNCTIONING PART
Check the following.
- Harness for open or short between camshaft position sensor (PHASE) and ECM
- Harness for open or short between camshaft position sensor (PHASE) and ECM relay
  1. Repair open circuit or short to ground or short to power in harness or connectors.
CHECK CMP SENSOR (PHASE) GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between camshaft position sensor (PHASE) terminal 1 and engine ground.
  Refer to the WIRING DIAGRAM .
  
  Continuity should exist.
3. Also check harness for short to power.
OK or NG
1. OK: GO TO 7.
2. NG: GO TO 6.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors F26, M58
- Harness for open or short between camshaft position sensor (PHASE) and ground
  1. Repair open circuit or short to power in harness or connectors.
CHECK CMP SENSOR (PHASE) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between CMP sensor (PHASE) terminal 2 and ECM terminal 14.
  Refer to WIRING DIAGRAM .
  
  Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 8.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK CAMSHAFT POSITION SENSOR (PHASE)
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 9.
2. 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
1. OK: GO TO 10.
2. NG: Remove debris and clean the signal plate of camshaft rear end or replace camshaft.
  
  Fig 4: Identifying Camshaft (Intake)
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK INTERMITTENT INCIDENT
Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
1. INSPECTION END