Diagnosis Procedure

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

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.
   TERMINAL VOLTAGE REFERENCE CHART
   
   

   Fuel level sensor unit and fuel pump		Ground	Voltage
   Connector	Terminal
   B40	4	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.
   TERMINAL CONTINUITY REFERENCE CHART
   
   

   Fuel level sensor unit and fuel pump		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   B40	4	E16	111	Existed

   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.
   TERMINAL CONTINUITY REFERENCE CHART
   
   

   Fuel level sensor unit and fuel pump		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   B40	5	E16	120	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: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

NO: Replace fuel level sensor unit and fuel pump. Refer to "EXPLODED VIEW ".