2004 CV police interceptor
Crank no start due to fuel pump not kicking on.
-12v w/key on at inertia switch wires. Low resistance between pins on inertia switch.
- 12v to white, brown/white, and pink/black wires at the fuel pump module.
- when turning ignition to on or cranking, the brown/white wire does not get grounded as it should.
- applied 12v to brown/white and pink/black that go to the pump motor and it runs.
- no communication with PCm through OBD port. Basically can't connect with my scan tool

So, either fuel pump module, PCM signal to fuel pump module, wiring to fuel pump module, or ?
How can I verify fuel module is good, and is receiving signal from PCM? My understanding is pcm control fuel pump relay, relay switches, and sends signal to fuel module to ground?

 

It appears the fuel pump module gets ground at all times to its terminal 2 from G400 ground point.
PATS on Ford's vehicles use both 12v and ground to trigger, fuel pump module like yours shouldn't use any ground trigger, so at the fuel pump module verify terminal 2 and 3 have continuity at all times.
You know you don't need to question the fuel pump relay and the inertia switch when you get 12v (white wire) at terminal 9 of your fuel pump module.
G400 and 14405 locations shown below (14405 is mentioned twice below when you look at the splice):


Splice 402 and 303 shown below:



That motor takes ground at brown/white and 12v at pink/black and I believe the motor spins one way (unlike power window motor that spins both ways to control up-down or down-up). I'm surprised how your motor runs when you feed 12v to both terminals and you didn't fire it, perhaps brown/white (terminal 6) is partially short to ground already.

You have both (obd port and fuel pump) issues and they first happened at the same time?

You have 7 circuits to verify as shown above, 5 of them can be verified with C175 below unplugged.

The other 2, Circuit 70 and Circuit 554 shown below:




If i were you I would try to fix the obd port first.

 

Should have clarified, applying 12v and ground from an external battery pack to pump wires are pump module connector, kicks the pump on.

Vehicle was started, driven on to trailer, driven off, and parked. Using chassis/engine/drivetrain for a project truck. Started parting out body panels and such. Doors removed and their harnesses cut where they come out of the pillars. Pass quarter panel/trunk/floor section cutout. Ground point g400 at trunk latch area intact. Tailights gone, but driver side tail lamp works. Pass side harness to pass tail lamp cut after c411. If the tail lights splice in on driver side area after the driver tail lamp and driver TL works, I'd think the ground is ok, but possibly issues at the splice after. Will test and check.

Also note that there is no click from the PCM or FP relay at the fuse box when key is turned to ON. Gauge cluster does turn on but the CEL does not illuminate (not sure if it should for self test?). Possibly burned out but I'm leaning towards PCM communication issue. Voltage at the fuel module connector wires does come on and off with key, so I'm assuming relay feeds 12v to them, and relay is working. Just odd I don't feel it click. Did swap relays around as well to verify.

 

Doesn't matter if you have analog or digital cluster, circuit 658 (20 awg PK/LG wire) is the one to check. You can also borrow or swap a bulb to verify.

Harness routing shown below.



If you have a scanner like Foxwell NT510 Elite or equivalent you might be able to run active test to your fuel pump module to verify, it might save you some time that way.

 

Out here checking the wiring. Ground 400 to fpm ground has good continuity.When you mentioned to make sure that pin 2 and 3 have good continuity at all times...did you mean between each other or from fpm to fp?

 

Nothing to do with fuel pump, just the module itself gets ground from G400 to its terminal 2 and that's the only ground source. So terminal 3 of fuel pump module should also get ground at all times from terminal 2.

If terminal 3 of fuel pump doesn't get ground and that's the only issue you can ground it.
1) no cutting, depin the brown/white wire from terminal 3 connector of your fuel pump module
2) The pink/orange wire at terminal 8 of your fuel pump, create a splice
3) connect the brown/white wire you depin to the splice

Fuel pump gets ground from G201 via terminal 8 (pink/orange wire) or you can ground the brown/white wire to elsewhere permanently or directly to G201. You only partially bypass the fuel pump module because it doesn't send ground signal.
The motor still can't energize by itself without the present of 12v from its PK/BK wire and the fuel pump module will take care of that.

 

No continuity between brown/wht at FPM to blK ground at FPM or g400 ground.
Will depin brown/wht and ground it else where.

Went through OBD wiring. Everything but LB wire is good. Currently LB/WH pin 7 of obd to restraints connector at pillar between doors is good. No continuity to driver door harness that has been cut. Have not checked other ends of the lb/wht wire circuit yet.

 

Yes do it, no harm no risk this way, the motor still has a 12v trigger PK/BK wire.

brown/white wire:
depin it = best
cut it = quick and acceptable
crimp a quick splice connector to it = bad

If you take short cut and create a splice and without cutting on the brown/white wire and ground it permanently some where, then there is a risk when the newly introduced ground signal is backfeeding into the module and damage it.

 

I always do solder joints unless it's a crimped eyelet on the end. Completed that task and fuel pump now kicks on with ignition on. Have no spark I'm assuming due to no communication issue. Going to test other circuits from your previous post to the pcm.
I do have an ABS light on and the airbag light flashes slowly. As mentioned I do not have continuity to the driver side door harness blue and white wire. Not sure if airbag restraint system will prevent communication or spark issue.

 

So looks like everything at the OBD is good, other than the lb/wht wire not having continuity to the drive door module wire where it comes through body at door hinges. Good continuity to abs module, and restraint connector at pillar between driver and pass doors (driverside). - would this be an issue? Checked the 3 grounds at pcm and all show voltage when connected to power, and good continuity on ground pins 3 and 24. 25 shows 0hms when first connected, then creeps up to 1.5-1.9k. might have pins 24/25 mixed up on the continuity.
- I'm assuming there's a power or ground issue with the pcm or the CEL circuit, causing the no communication?
- Should I be checking continuity on circuits with key on or off? I'd assume with PCM connector connected and disconnected to rule out internal issue with the PCM?

Didn't have a chance to check the pink/green circuit for CEL yet. Will update once I get that checked.