DTC Diagnosis Procedure
WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK ENGINE COOLANT TEMPERATURE SENSOR POWER SUPPLY
- Turn ignition switch OFF.
- Disconnect engine coolant temperature (ECT) sensor harness connector.
- Turn ignition switch ON.
- Check the voltage between ECT sensor harness connector and ground.
+
-
Voltage
(Approx.)
ECT sensor
Connector
Terminal
F70
1
Ground
5 V
Is the inspection result normal?
YES
GO TO 3.
NO
GO TO 2.
- CHECK ENGINE COOLANT TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between ECT sensor harness connector and ECM harness connector.
+
-
Continuity
ECT sensor
ECM
Connector
Terminal
Connector
Terminal
F70
1
F54
31
Existed
- Also check harness for short to ground.
Is the inspection result normal?
YES
Perform the trouble diagnosis for power supply circuit.
NO
Repair or replace error-detected parts.
- CHECK ENGINE COOLANT TEMPERATURE SENSOR GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between ECT sensor harness connector and ECM harness connector.
+
-
Continuity
ECT sensor
ECM
Connector
Terminal
Connector
Terminal
F70
2
F54
35
Existed
- Also check harness for short to ground to power.
Is the inspection result normal?
YES
GO TO 4.
NO
Repair or replace error-detected parts.
- CHECK ENGINE COOLANT TEMPERATURE SENSOR
Check the engine coolant temperature sensor. Refer to Component Inspection .
Is the inspection result normal?
YES
Check intermittent incident. Refer to Intermittent Incident .
NO
Replace engine coolant temperature sensor. Refer to Exploded View .