Diagnosis Procedure

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

Which malfunction is detected?

A

GO TO 2.

B

GO TO 5.

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.

   +		-	Voltage
   Fuel level sensor unit and fuel pump
   Connector	Terminal
   B42	3	Ground	Approx. 5 V

Is the inspection result normal?

YES

GO TO 4.

NO

GO TO 3.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between fuel tank temperature sensor harness connector and ECM harness connector.

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 ECM harness connector.
3. 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

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

Is the inspection result normal?

YES

GO TO 5.

NO

Repair open circuit, short to ground or short to power in harness or connector.

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 .