Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Procedure
- CHECK STARTING SYSTEM
Turn ignition switch to START position.
Does the engine turn over?
Does the starter motor operate?
Yes or No
- Yes: GO TO 2.
- No: Check starting system. (Refer to "STARTERS ".)
- RETIGHTEN GROUND SCREWS
- Turn ignition switch OFF.
- Loosen and retighten engine ground screws.
- GO TO 3.
- CHECK CMP SENSOR (PHASE) POWER SUPPLY CIRCUIT
- Disconnect camshaft position (CMP) sensor (PHASE) harness connector.
- Turn ignition switch ON.
- Check voltage between CMP sensor (PHASE) terminal 1 and ground with CONSULT-II or tester.
Voltage: Battery voltage
- Also check harness for short to ground and short to power.
Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 5.
- NG: GO TO 4.
- DETECT MALFUNCTIONING PART
Check the following.
- Harness for open or short between camshaft position sensor (PHASE) and ECM relay
- Harness for open or short between camshaft position sensor (PHASE) and ECM
- 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
- Turn ignition switch OFF.
- Check harness continuity between (CMP) sensor (PHASE) terminal 3 and engine ground. Refer to the WIRING DIAGRAM .
Continuity should exist.
- Also check harness for short to power.
OK or NG
- OK: GO TO 7.
- NG: GO TO 6.
- DETECT MALFUNCTIONING PART
Check the following.
- Harness connector M58, F26
- Harness for open or short between crankshaft position sensor (POS) and engine ground
- Repair open circuit short to power in harness or connectors.
- CHECK CMP SENSOR (PHASE) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
- Disconnect ECM harness connector.
- Check harness continuity between CMP sensor (PHASE) terminal 2 and ECM terminal 14 or 13. Refer to WIRING DIAGRAM .
Continuity should exist.
- Also check harness for short to ground and short to power.
OK or NG
- OK: GO TO 8.
- 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
- OK: GO TO 9.
- 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 10.
- NG: Remove debris and clean the signal plate of camshaft rear end or replace camshaft.
- CHECK INTERMITTENT INCIDENT
Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
- INSPECTION END
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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