Nissan Versa
Sedan Service Manual
Engine » Engine control system (EC) » P0181 FTT sensor
Diagnosis Procedure

1.INSPECTION START

Confirm the detected malfunction (A or B). Refer to EC, "DTC Logic".

Which malfunction is detected?

A >> GO TO 2.

B >> GO TO 6.

2.CHECK DTC WITH COMBINATION METER

Check DTC with combination meter. Refer to MWI, "CONSULT Function" (TYPE A) or MWI, "CONSULT Function" (TYPE B). Check the vehicle type to confirm the service information in MWI section. Refer to MWI, "Information".

Is the inspection result normal?

YES >> GO TO 3.

NO >> Proceed to MWI, "Component Function Check" (TYPE A) or MWI, "Component Function Check" (TYPE B).

3.CHECK FUEL TANK TEMPERATURE (FTT) SENSOR POWER

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.

Is the inspection result normal?

YES >> GO TO 5.

NO >> GO TO 4.

4.CHECK FUEL TANK TEMPERATURE (FTT) 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.

4. Also check harness for short to ground and to power.

Is the inspection result normal?

YES >> Perform the trouble diagnosis for power supply circuit.

NO >> Repair or replace errordetected parts.

5.CHECK FTT 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.