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Old 11-25-2018, 12:04 PM   #1
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2002 bad ground fuel pump

Did a clutch job and ended up with no crank no start. I atached a little group of wires that i thought went to the positive and i was wrong it went to ground. So i found that my clutch saftey switch was not working unless i added a ground to it . that got it cranking. So now I have found that I have no ground off of the fuel pump. I have replaced the fuel pump motor. And the fuel control module. Still no ground. Which means the fuel pump will not kick on.


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Old 11-25-2018, 09:03 PM   #2
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Quote:
Originally Posted by Chads183 View Post
...a little group of wires that i thought went to the positive and i was wrong it went to ground....
You have to consider this mistake. That could have damaged something, maybe blown a fuse. However, it could have been worse, if it was (opposite) a group of hot wires accidentally connected to ground.

Did you ever figure out what those "group of wires" are used for. It might help to know which wires were accidentally connected to hot voltage.

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Originally Posted by Chads183 View Post
...So i found that my clutch saftey switch was not working unless i added a ground to it . that got it cranking...
Those switch types do fail, somewhat common, but very strange it stopped working while you were doing the other work. Seems a little too coincidental.

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Originally Posted by Chads183 View Post
...So now I have found that I have no ground off of the fuel pump. I have replaced the fuel pump motor. And the fuel control module. Still no ground. Which means the fuel pump will not kick on.
How do you know you are missing a ground? Did you use a multi-meter (DVM) and a wire diagram? Do you know the exact connector, pin-number, wire color, of the missing ground?

If you can prove that you are missing a ground, great! Until then, I ask you consider that the problem could be elsewhere; such as a missing voltage.

Fuel pump control is a little complex, -it has several players to consider.

Gd luck
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Old 11-26-2018, 03:30 AM   #3
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Man you guys (not you Marde) are hard on cars!

The clutch safety switch does NOT ground. The starter will work but the signal goes through safety switch to the PCM and informs it the clutch is pushed in and then the PCM allows starting up by activating the fuel pump. The clutch safety is a switch to PCM telling it when it is OK to work pump, you are missing that signal.

If one of those little group of wires was a black/orange or black/yellow wire it was a PCM ground and you just ran power into the PCM backwards, the best way to torch one I can think of. If so that one may cost you.

Last edited by amc49; 11-26-2018 at 04:05 AM.
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Old 11-26-2018, 06:18 PM   #4
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Originally Posted by amc49 View Post
...The clutch safety switch does NOT ground...
Ha! Thanks for catching my mistake. He said "ground" and I was thinking he only jumpered the switch (like when some people use a paperclip to jump it). My bad, my brain-fart.

Yes, do not (car frame) ground that clutch switch circuit!
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Old 12-05-2018, 07:12 AM   #5
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Yes i believe i did somthing to pcm . it is not comunicateing to the fuel delivery modual. I believe that is what gives it a variable ground that kicks fuel pump on and off. If i manually ground fuel pump then it will run all the time but i cant have that and it acts like its running on 2 cylinders. So i belive it is the pcm. But i dont know how i got the ground on the clutch switch issue especialy if there is not suppose to be one and yes i used a jumper. This is why i had a no crank no start it was in the clutch switch issue. Bit not knowing that at first is where i went wrong thinking has to be a wire i missed doing clutch job only i didnt find any thi g missed so i thought i messed up and put that orange black on ground and moved to positive . as soon as i did i herd relays click but then got all dashes on insturment panel moved it back and got my speedo back. And it comunicated with a code scan er and seems to look normal but i now truely belive it is not. So i guess thats my next step replace the pcm. Thanks for you everyones input .
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Old 12-05-2018, 03:03 PM   #6
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I would check the roll over switch in the pass kick panel , push it and see if it clicks , if it does check fuel psi again

Tom
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Old 12-06-2018, 01:51 AM   #7
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Quote:
Originally Posted by Chads183 View Post
...so i thought i messed up and put that orange black on ground and moved to positive . as soon as i did i herd relays click but then got all dashes on insturment panel moved it back and got my speedo back. And it comunicated with a code scan er and seems to look normal but i now truely belive it is not. So i guess thats my next step replace the pcm. Thanks for you everyones input .
Quote:
Originally Posted by amc49 View Post
...If one of those little group of wires was a black/orange or black/yellow wire it was a PCM ground and you just ran power into the PCM backwards, the best way to torch one I can think of. If so that one may cost you.
OK Nostradamus, it appears your visions are clear. The OP (Chads) apparently shorted "that PCM ground wire" to the battery positive hot voltage terminal. That was an oh shit moment.

HOWEVER, please note that after he did this mistake, the PCM rebounded and resumed data communications to the systems (in general). The "odometer dashes" disappeared and the OBDII port was then able to communicate to his scan tool. The summary of this silly-stupid OP mistake did not result in a PCM hard fail. <<see my next post>>.

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Yes i believe i did somthing to pcm . it is not comunicateing to the fuel delivery modual...
That is possible, but I doubt you have any proof, that the PCM is not communicating to the FPDM.

Quote:
Originally Posted by Chads183 View Post
... If i manually ground fuel pump then it will run all the time...
Did you do that? Did you manually ground the fuel pump? If yes, how exactly did you do that?

Quote:
Originally Posted by Chads183 View Post
... And it comunicated with a code scan er and seems to look normal but i now truely belive it is not. So i guess thats my next step replace the pcm. Thanks for you everyones input .
Replace the PCM?
All of your testing was done without a DVM (meter) or a 2002 Focus wiring diagram right? -no? I doubt your PCM is bad.


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Originally Posted by 1turbofocus View Post
I would check the roll over switch in the pass kick panel , push it and see if it clicks , if it does check fuel psi again

Tom
That is always a great idea, to check that switch. The FPDM (and fuel pump) is SHUT-OFF from fuse +power when that inertia switch is tripped. BTW that switch has nothing to do with a "missing ground" as the OP has talked about.
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Old 12-06-2018, 02:17 AM   #8
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Quote:
Originally Posted by amc49 View Post
...If one of those little group of wires was a black/orange or black/yellow wire it was a PCM ground
BIG NEWS FLASH:
That "PCM ground wire" has been talked about (and feared?) for several years here at FF. I have always doubted that this small single wire was the PCM electrical ground.

After surfing thru my Ford wiring diagrams earlier tonight, I am semi-very-sure my suspicious are correct. That special (Blk/Orn) ground wire is not the PCM electrical ground. That special & mysterious ground wire is not the PCM electrical ground.

That special ground wire is an electrical ground for several circuits and relays TO INCLUDE the PCM Power Hold Relay (PHR). This (Blk/Orn) wire is NOT a ground wire for the PCM.

If you disconnect this small Blk/Orn wire from the car battery negative terminal you are NOT disconnecting the PCM ground wire; you are only electrically disconnecting a set of relays, which also prevents the PCM from powering-on. This is why you get "dashes in the odometer" when that small (Blk/Orn) ground wire is disconnected.

There are several other circumstances where dashes can appear in the odometer, and I am not attempting to cover all of those circumstances here in this thread.

Cheers!
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Old 12-08-2018, 06:35 AM   #9
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You are 100% right there, I just never said anything as I rock the boat around here enough as it is. I looked up the same circuit maybe 3-4 months ago in search of something else the likes of which I cannot remember now. I've been chiming in with the magpies.

Sometimes you just gotta roll with the flow, if you correct EVERYTHING then people think you are a b-tch. Sound familiar???? I stay there enough as it is.
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Last edited by amc49; 12-08-2018 at 06:44 AM.
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Old 12-30-2018, 06:31 PM   #10
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A mechanic has my car now. I ordered the pcm and he replaced it fixed my fuel pump issue. Now he has to figure out why it sounds like it is only running on 2 cylinders. As of that I have no idea what is going on because the guy is not Harley getting back to me to tell me anyting. But if I hear anything new I will let. Yes PCM still look good but it did get its brain scrambled along with some other things we are trying to sort out
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