Fuel Pump Driver Module
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Joined: Jul 2008
Posts: 79
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From: Tri-Cities, TN
Fuel Pump Driver Module
I've wrestled with this device for two weeks, and I'm peaved.
I finally narrowed it down to crankshaft sensors, after replacing this faulty device, BUT, I found an interesting post on another site that tells what each wire does on that mysterious device that ford had the nerve to desing
Here is what each wire does:
The White (W) wire at FPDM pin 5 should show battery voltage, whenever the ignition key is on, from the fuel pump relay and inertia switch.
The Black/Yellow (BK/Y) wire at FPDM pin 3 is a dedicated ground for the FPDM.
The Pink/Black (PK/BK) wire at FPDM pin 4 is power out of the FPDM feeding the fuel pump. This circuit should show battery voltage whenever the key is in the run position.
The Brown/White (BR/WH) wire at FPDM pin 2 is the fuel pump ground circuit. This circuit is duty cycled with a ground signal from the FPDM based on the command from the Powertrain Control Module (PCM). Back probing this circuit with a jumper wire and grounding it should result in 70+ PSI of fuel pressure if there is power to the fuel pump and the pump is good.
The White /Yellow (W/Y) wire at FPDM pin 6 is the command signal sent from the PCM to the FPDM. The voltage on this circuit is generally a 1-5 volt reading, the higher the voltage reading, the higher pressure is being commanded.
The Light Blue/Orange (LB/O) wire at FPDM pin 1 is a feedback signal sent from the FPDM back to the PCM
I hope this will save some shade tree mechanics sometime, and I apologize if someone had already posted this.
Good Night! And Good Luck!
Izzy
I finally narrowed it down to crankshaft sensors, after replacing this faulty device, BUT, I found an interesting post on another site that tells what each wire does on that mysterious device that ford had the nerve to desing
Here is what each wire does:
The White (W) wire at FPDM pin 5 should show battery voltage, whenever the ignition key is on, from the fuel pump relay and inertia switch.
The Black/Yellow (BK/Y) wire at FPDM pin 3 is a dedicated ground for the FPDM.
The Pink/Black (PK/BK) wire at FPDM pin 4 is power out of the FPDM feeding the fuel pump. This circuit should show battery voltage whenever the key is in the run position.
The Brown/White (BR/WH) wire at FPDM pin 2 is the fuel pump ground circuit. This circuit is duty cycled with a ground signal from the FPDM based on the command from the Powertrain Control Module (PCM). Back probing this circuit with a jumper wire and grounding it should result in 70+ PSI of fuel pressure if there is power to the fuel pump and the pump is good.
The White /Yellow (W/Y) wire at FPDM pin 6 is the command signal sent from the PCM to the FPDM. The voltage on this circuit is generally a 1-5 volt reading, the higher the voltage reading, the higher pressure is being commanded.
The Light Blue/Orange (LB/O) wire at FPDM pin 1 is a feedback signal sent from the FPDM back to the PCM
I hope this will save some shade tree mechanics sometime, and I apologize if someone had already posted this.
Good Night! And Good Luck!
Izzy
Senior Member
Joined: Sep 2009
Posts: 3,031
Likes: 45
From: The Shenandoah Valley
I had it on a CD, didn't know anyone was looking?
I hink that lite blue & orange wire is maybe the one I found almost bi two, just a strand or two left...
... Bad Squirrel!
I hink that lite blue & orange wire is maybe the one I found almost bi two, just a strand or two left...
... Bad Squirrel!
Last edited by tbear853; Apr 14, 2011 at 10:49 PM.