No Start. Please HELP!!!!

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Dec 19, 2007 | 09:54 PM

dimarra

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Joined: Aug 2004

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From: Delmarva

No Start. Please HELP!!!!

HELP!!!

2004 5.4 F150 SCrew won't start!! Won't turn over at all.

Was trying to track down a trailer lighting issue. Checking fuses. Removed a relay to get to one fuse. Turns out that relay was for the PCM.

I ASSUME I've triggered the antitheft system but the manual isn't any help.

I do hear a click from the fuse panel when I turn the key to "on."

Am currently searching the forum, but I need this thing going by 8:00am Eastern time. The high school band's trailer is hooked up to it and the show MUST go on.

(Hopefully, this is a simple, "Just wait," or simply "turn this" problem.)
Many, many thanks in advance,
Keith

Dec 19, 2007 | 10:02 PM

screwy

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From: Over Yonder, MN

How about a little more info. Are there any dash lights? What happens when you turn it to on, just the click in the panel and no power? When you turn it to start? Be as specific as possible to exactly what happens when you do this or that. I assume you put the relay back in snuggly.

Dec 19, 2007 | 10:10 PM

dimarra

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Joined: Aug 2004

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From: Delmarva

Turn key to "on," all instrument panel lights come on and I hear the click from the fuse box.

Turn key to "start" and nothing further happens. No changes.

My ScanGauge, which is plugged into the OBD port, does NOT come on in either position.

Relay is firmly in place.

Yes, I did unplug the trailer. ...not that expect that to part of the problem.

(How can anyone who is not a contortionist get to that fuse box?)

Keith

Dec 19, 2007 | 10:15 PM

screwy

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From: Over Yonder, MN

Well a rapidly flashing light up on the dash by the windshield would indicate an antitheft problem. Start by checking fuse 29 (15 amp) I’ll dig up the wiring diagrams and see if I can find something. Might also try playing with that relay, seems like that’s the obvious place for the problem to be.

Dec 19, 2007 | 10:26 PM

DonsFx4

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From: Marple Township, PA

Could also try disconnecting the negative terminal on the battery for 20-30 minutes...this might reset the computer. Of course, the PCM would have to 'learn' all over again, but at least you'd be able to make the "show"!!!

Dec 19, 2007 | 10:30 PM

dimarra

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From: Delmarva

SOLVED!!!

I feel so #$%^ stupid.

In my bending/twisting to see the fuse box, I mixed up left/right. The PCM relay was OUT and the trailer relay was still in.

Apparently, the PCM relay needs to actually be plugged into the fuse box, not laying on the floor next to it.

Screwy called it first post.

Thank you one and all for dealing with my blatant stupidity.

Keith

Dec 19, 2007 | 10:36 PM

screwy

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From: Over Yonder, MN

Good, you did not want to see the list of possible problems I had compiled, the PCM is a frigin maze of wires many of which can kill it. I was up to 6 different fuses that power it.