Diagnostic Procedure

CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws on the body. Refer to "GROUND INSPECTION ".
  
  Fig 1: Locating ECM Ground Screws
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK : GO TO 2.
2. NG : Repair or replace ground connections.
CHECK CRANKSHAFT POSITION (CKP) SENSOR (POS) POWER SUPPLY CIRCUIT
1. Disconnect crankshaft position (CKP) sensor (POS) harness connector.
  
  Fig 2: Disconnecting Crankshaft Position (CKP) Sensor (POS) Harness Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
2. Turn ignition switch ON.
3. Check voltage between CKP sensor (POS) terminal 1 and ground with CONSULT-II or tester.
  1. Voltage: Battery voltage
  Fig 3: Checking Voltage Between CKP Sensor (POS) 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 4.
2. NG : GO TO 3.
DETECT MALFUNCTIONING PART
Check the following.
- Harness for open or short between crankshaft position sensor (POS) and ECM
- Harness for open or short between crankshaft position sensor (POS) and ECM relay
  1. : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK CKP (POS) GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check harness continuity between CKP sensor (POS) terminal 3 and ground. Refer to WIRING DIAGRAM .
  1. Continuity should exist.
3. Also check harness for and short to power.
OK or NG
1. OK : GO TO 6.
2. NG : GO TO 5.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors F26, M58
- Harness for open or short between crankshaft position sensor (POS) and ground.
  1. : Repair open circuit or short to power in harness or connectors.
CHECK CKP SENSOR (POS) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 13 [Without NVIS (NATS)] or 14 [With NVIS (NATS)] and CKP sensor (POS) terminal 2.
  Refer to WIRING DIAGRAM .
  1. Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
1. OK : GO TO 7.
2. NG : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK CRANKSHAFT POSITION SENSOR (POS)
Refer to "COMPONENT INSPECTION ".

OK or NG
1. OK : GO TO 8.
2. NG : Replace crankshaft position sensor (POS).
CHECK GEAR TOOTH
Visually check for chipping signal plate gear tooth.

OK or NG
1. OK : GO TO 9.
2. NG : Replace the signal plate.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. : INSPECTION END