Diagnosis Procedure
WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK GROUND CONNECTIONS
- Turn ignition switch OFF.
- Loosen and retighten ground screws on the body.
Refer to "GROUND INSPECTION ".
OK or NG
OK: GO TO 2.
NG: Repair or replace ground connections.
- CHECK ENGINE COOLANT TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
- Disconnect engine coolant temperature (ECT) sensor harness connector.
- Turn ignition switch ON.
- Check voltage between ECT sensor terminal 1 and ground with CONSULT or tester.
Voltage: Approximately 5 V
Courtesy of NISSAN NORTH AMERICA, INC.
OK or NG
OK: GO TO 4.
NG: GO TO 3.
- DETECT MALFUNCTIONING RART
Check the following.
- Harness connector F38, F275
- Harness for open or short between ECM and engine coolant temperature sensor
Repair open circuit or short to ground or short to power in harness or connectors.
- CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check harness continuity between ECT sensor terminal 2 and ECM terminal 67.
Refer to WIRING DIAGRAM .
Continuity should exist .
- Also check harness for short to ground and short to power.
OK or NG
OK: GO TO 6.
NG: GO TO 5.
- DETECT MALFUNCTIONING PART
Check the following.
- Harness connector F38, F275
- Harness for open and short between ECT sensor and ECM
Repair open circuit or short to ground or short to power in harness or connectors.
- CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to "COMPONENT INSPECTION ".
OK or NG
OK: GO TO 7.
NG: Replace engine coolant temperature sensor. Refer to CYLINDER HEAD .
- CHECK INTERMITTENT INCIDENT
Refer to "INTERMITTENT INCIDENT ".
>> INSPECTION END