Ford Repair Questions? Ask a Mechanic for Answers ASAP
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Here are the diagrams that you need:
You need to begin by testing the fuel pump driver module (see diagram below):
The Fuel Pump Driver Module (FPDM) controls the Fuel Delivery Module (FDM) in a returnless system. The Powertrain Control Module (PCM) gets input from the fuel pressure sensor in the fuel rail and temperature readings from the Engine Coolant Temperature (ECT) sensor and the Intake Air Temperature (IAT) sensor. The PCM then sends a duty cycle signal to the FPDM which results in variable speed fuel pump operation.
Check for signal from the Fuel Pump Driver Module to the fuel pump.
Please check this and let me know the outcome.
You need to access the fuel driver module and probe the wires that send the signal to the fuel pump.
The two wires are the Blue with Black stripe and Blue with White stripe.
Here is how to test (perform this test on each wire):
1. Turn the ignition key to the "ON" position
2. Take a test light and ground it to the body of the vehicle
3. Use the probe on the end of the test light to penetrate the insulation of the wires
4. If the test light illuminates, then the FPDM is good.
5. If they do not light up, then check the other wires.
6. If the other wires don't show power, then there is a problem in the signal being sent from the ECU
7. Next step would be to test inertia switch (fuel cutoff switch)
That would leave the Powertrain Control Module (Engine Computer).
You need to check pin #80 which is the fuel pump control. You also need to check pin #40 which works as the fuel pump relay monitor. If you lack power from either of these pins with the key on then you need to replace the PCM.
The PCM is located under the shifter.