FUEL PUMP UNIT INSPECTION [AJ (3.0L Duratec)]

FUEL PUMP UNIT INSPECTION [AJ (3.0L Duratec)]

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Warning

• Fuel is very flammable liquid. If fuel spills or leaks from the pressurized fuel system, it will cause serious injury or death and facility breakage. Fuel can also irritate skin and eyes. To prevent this, always complete the "Fuel Line Safety Procedure", while referring to "BEFORE SERVICE PRECAUTION".

• Fuel is very flammable liquid. If fuel spills or leaks from the pressurized fuel system, it will cause serious injury or death and facility breakage. Fuel can also irritate skin and eyes. To prevent this, before performing the fuel pump unit removal/installation, always complete the "Fuel Leak Inspection After Fuel Pump Unit Installation".

• A person charged with static electricity could cause a fire or explosion, resulting in death or serious injury. Before draining fuel, make sure to discharge static electricity by touching the vehicle body.

Continuity Inspection

1. Disconnect the negative battery cable.

2. Disconnect the fuel pump unit connector. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [AJ (3.0L Duratec)].)

3. Inspect for continuity between fuel pump unit terminals C—D.

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• If there is continuity, perform the Circuit Open/Short Inspection.

• If there is no continuity, replace the fuel pump unit.

Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION[AJ (3.0L Duratec)].)

2. Inspect the following wiring harness for open or short (continuity check).

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Open circuit

• If there is no continuity, the circuit is open. Repair or replace the harness.

― Fuel pump unit terminal C and fuel pump relay terminal E

― Fuel pump unit terminal D and body ground

Short circuit

• If there is continuity, the circuit is shorted. Repair or replace the harness.

― Fuel pump unit terminal C and body ground

― Fuel pump unit terminal D and power supply

Note

• The fuel static pressure inspection cannot be performed because the pressure regulator is integrated with the fuel pump unit.