Diagnostic Procedure

CHECK STARTING SYSTEM
Turn ignition switch to START position.
1. Does the engine turn over?
2. Does the starter motor operate?
Yes or No
1. Yes : GO TO 2.
2. No : Check starting system. (Refer to STARTING SYSTEM .)
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body. Refer to "GROUND INSPECTION ".
  
  Fig 1: Loosening ECM Ground Screws
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : GO TO 3.
2. NG : Repair or replace ground connections.
CHECK CAMSHAFT POSITION (CMP) SENSOR (PHASE) POWER SUPPLY CIRCUIT
1. Disconnect camshaft position (CMP) sensor (PHASE) harness connector.
  
  Fig 2: Disconnecting Camshaft Position (CMP) Sensor (PHASE) Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Turn ignition switch ON.
3. Check voltage between CMP sensor (PHASE) terminal 1 and ground with CONSULT- II or tester.
  1. Voltage: Battery voltage
  Fig 3: Checking Voltage Between CMP Sensor (PHASE) Connector Terminal 1 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
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.
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 CMP sensor (PHASE) terminal 3 and ground.
  1. 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 connector F26, M58
- Harness for open or short between CMP 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 ECM terminal 14 [Without NVIS (NATS)] or 13 [With NVIS (NATS)] and CMP sensor (PHASE) terminal 2.
  Refer to WIRING DIAGRAM .
  1. Continuity should exist.
3. Also check harness for short to ground or 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
Fig 4: Checking Camshaft (Intake)
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK : GO TO 10.
2. NG : Remove debris and clean the signal plate of camshaft rear end or replace camshaft.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. : INSPECTION END