DTC Diagnosis Procedure

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

Which malfunction is detected?

A

GO TO 2.

B

GO TO 6.

Check DTC with combination meter. Refer to CONSULT Function (METER/M&A) .

Is the inspection result normal?

YES

GO TO 3.

NO

Proceed to Component Function Check .

1. Turn ignition switch OFF.
2. Disconnect fuel level sensor unit and fuel pump harness connector.
3. Turn ignition switch ON.
4. Check the voltage between fuel level sensor unit and fuel pump harness connector and ground.

   Courtesy of NISSAN NORTH AMERICA, INC.

   +		-	Voltage (Approx.)
   Fuel level sensor unit and fuel pump
   Connector	Terminal
   C5	4	Ground	5 V

Is the inspection result normal?

YES

GO TO 5.

NO

GO TO 4.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between fuel level sensor unit and fuel pump harness connector and ECM harness connector.

   +		-		Continuity
   Fuel level sensor unit and fuel pump		ECM
   Connector	Terminal	Connector	Terminal
   C5	4	E16	128	Existed

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 error-detected parts.

1. Turn ignition switch OFF.
2. Disconnect combination meter harness connector.
3. Check the continuity between fuel level sensor unit and fuel pump harness connector and combination meter harness connector.

   +		-		Continuity
   Fuel level sensor unit and fuel pump		Combination meter
   Connector	Terminal	Connector	Terminal
   C5	5	M24	24	Existed

4. Also check harness for short to power.

Is the inspection result normal?

YES

GO TO 6.

NO

Repair or replace error-detected parts.

Check the FTT sensor. Refer to Component Inspection .

Is the inspection result normal?

YES

Check intermittent incident. Refer to Intermittent Incident .

NO

Replace fuel level sensor unit and fuel pump. Refer to Removal and Installation - VQ40DE .