Diagnosis Procedure
WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK ENGINE COOLANT TEMPERATURE SENSOR 1 POWER SUPPLY CIRCUIT
- Disconnect engine coolant temperature (ECT) sensor 1 harness connector.
- Turn ignition switch ON.
- Check the voltage between ECT sensor 1 harness connector and ground.
ECT sensor 1
Ground
Voltage (V)
Connector
Terminal
F28
1
Ground
Approx. 5
Is the inspection result normal?
YES
GO TO 2 .
NO
Repair open circuit, short to ground or short to power in harness or connectors.
- CHECK ECT SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between ECT sensor 1 harness connector and ECM harness connector.
ECT sensor 1
ECM
Continuity
Connector
Terminal
Connector
Terminal
F28
2
F78
43
Existed
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO 3 .
NO
Repair open circuit, short to ground or short to power in harness or connectors.
- CHECK ENGINE COOLANT TEMPERATURE SENSOR 1
Refer to Component Inspection (Engine Coolant Temperature Sensor 1) .
Is the inspection result normal?
YES
INSPECTION END
NO
Replace engine coolant temperature sensor 1.