DTC Diagnosis Procedure
WARNING: This page is about a different car, the 2019 Nissan NV3500 HD and 2019 Nissan NV2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
- Disconnect mass air flow (MAF) sensor (intake air temperature sensor is built-in) harness connector.
- Turn ignition switch ON.
- Check the voltage between MAF sensor harness connector and ground.
MAF sensor
Ground
Voltage (V)
Connector
Terminal
F73
2
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 INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between MAF sensor harness connector and ECM harness connector.
MAF sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
F73
1
F78
42
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 INTAKE AIR TEMPERATURE SENSOR
Refer to Component Inspection (Intake Air Temperature Sensor) .
Is the inspection result normal?
YES
INSPECTION END
NO
Replace mass air flow sensor (with intake air temperature sensor).