Diagnosis Procedure

1. Turn ignition switch OFF.
2. Disconnect Fuel pump control module harness connector.
3. Turn ignition switch ON.
4. Check the voltage between Fuel pump control module harness connector and ground.

   +		-	Voltage
   Fuel pump control module
   Connector	Terminal
   B50	6	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 5.

NO

GO TO 2.

1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector.
3. Check the continuity between IPDM E/R harness connector and Fuel pump control module harness connector.

   IPDM E/R		Fuel pump control module		Continuity
   Connector	Terminal	Connector	Terminal
   E121	15	B50	6	Existed

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

Is the inspection result normal?

YES

GO TO 3.

NO

Repair or replace error-detected parts.

Check that the following fuse is not blowing.

Is the fuse blown (open)?

YES

Replace the fuse after repairing the applicable circuit.

NO

GO TO 4.

Check intermittent incident. Refer to Intermittent Incident .

Is the inspection result normal?

YES

Perform trouble diagnosis for power supply circuit.

NO

Repair or replace error-detected parts.

1. Turn ignition switch OFF.
2. Check the continuity between Fuel pump control module harness connector and ground.

   Fuel pump control module		--	Continuity
   Connector	Terminal
   B50	3	Ground	Existed

3. Also check harness for short to power.

Is the inspection result normal?

YES

GO TO 6.

NO

Repair or replace error-detected parts.

1. Disconnect ECM harness connector.
2. Check the continuity between Fuel pump control module harness connector and ECM harness connector.

   Fuel pump control module		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   B50	4	E32	182	Existed
   	5		188

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

Is the inspection result normal?

YES

GO TO 7.

NO

Repair or replace error-detected parts.

1. Disconnect "fuel level sensor unit and fuel pump" harness connector.
2. Check the continuity between Fuel pump control module harness connector and "fuel level sensor unit and fuel pump" harness connector.

   Fuel pump control module		Fuel level sensor unit and fuel pump		Continuity
   Connector	Terminal	Connector	Terminal
   B50	1	B72	6	Existed
   	2		4

Is the inspection result normal?

YES

GO TO 8.

NO

Repair or replace error-detected parts.

Check fuel pump. Refer to Component Inspection (Fuel Pump) .

Is the inspection result normal?

YES

GO TO 9.

NO

Replace fuel level sensor, fuel filter and fuel pump assembly. Refer to Removal and Installation .

Check fuel pump control module. Refer to Component Inspection (Fuel Pump Control Module) .

Is the inspection result normal?

YES

Check intermittent incident. Refer to Intermittent Incident .

NO

Replace fuel pump control module. Refer to Removal and Installation .