Diagnosis Procedure
WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY
- Turn ignition switch OFF.
- Disconnect "fuel level sensor unit and fuel pump" harness connector.
- Turn ignition switch ON.
- Check the voltage between "fuel level sensor unit and fuel pump" harness connector and ground.
+
-
Voltage
Fuel level sensor unit and fuel pump
Connector
Terminal
B42
3
Ground
Approx. 5 V
Is the inspection result normal?
YES
GO TO 3.
NO
GO TO 2.
- CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between "fuel level sensor unit and fuel pump" harness connector and ECM harness connector.
Fuel level sensor unit and fuel pump
ECM
Continuity
Connector
Terminal
Connector
Terminal
B42
3
E10
128
Existed
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO 3.
NO
Repair or replace error-detected parts.
- CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between "fuel level sensor unit and fuel pump" harness connector and ECM harness connector.
Fuel level sensor unit and fuel pump
ECM
Continuity
Connector
Terminal
Connector
Terminal
B42
1
E10
148
Existed
- Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
GO TO 4.
NO
Repair or replace error-detected parts.
- CHECK FUEL TANK TEMPERATURE SENSOR
Check fuel tank temperature sensor. Refer to Component Inspection .
Is the inspection result normal?
YES
INSPECTION END
NO
Replace "fuel level sensor unit and fuel pump". Refer to Removal and Installation .