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General >> Troubleshooting

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Tony2005
Addicted CEG'er

Reged: 06/19/05
Posts: 5345
Loc: Virginia, USA
Re: Car died, have run some checks, PCM next? new
#1294846 (Re: F111D F) 08/06/06 11:55 PM

Originally posted by F111D F:
..Before I forget again I ran into another diagram, besides pin 71 it shows pin 97 connected to the output of PCM relay? ....




Yes, Pin 97 is also Green/Yellow for Vehicle Power and is 12 to 14 V at hot idle.

--------------------
"Always do the cheap and easy ones first."

1996 V6 ATX 96K miles


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cj leadfoot
New CEG'er

Reged: 08/21/02
Posts: 13
Loc: Commerce, MI
Re: Car died, have run some checks, PCM next? new
#1294958 (Re: Tony2005) 08/07/06 02:28 AM

Paul and Tony,

To answer some or your questions,
- NO fuses blew. Wish at least one had.
- I believe PCM does get power. Relay kicks in and check engine light illuminates both when ignition on and when cranking. With relay pulled, no light.
- From what I can tell, PCM is getting inputs but not sending much down the line.

My trip through the battery junction box was a good learning experience but not helpful to the problem. Seems relay terminal assignments 3&5(high side in/out) are reversed from what the official Ford electrical troubleshooting manual states. Not a functional issue but it helps to know which wire you're probing. Once I started checking the right wires the problem I was chasing was no longer an issue.

I appreciate all your help. As much as I detest "try it and see" approach, that is where I'm headed next. New PCM and then we'll see.

--------------------
silver '98 E0
bone stock except
225/60 -16's on 16 x 7's (45 et)


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F111D F
Veteran CEG'er

Reged: 05/27/00
Posts: 635
Loc: Lucas,Ohio
Re: Car died, have run some checks, PCM next? new
#1295247 (Re: cj leadfoot) 08/07/06 03:43 PM

I've a magic rubber mallet!
Paul

--------------------
Paul
98 Mystique LS 2ea (07/97)(08/98)

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cj leadfoot
New CEG'er

Reged: 08/21/02
Posts: 13
Loc: Commerce, MI
Wrap-up new
#1298825 (Re: F111D F) 08/11/06 10:49 PM

Cheers all around! After slapping in the new PCM we are back in business.

Thanks to all who pointed me down the right path.

My freindly Ford counterman mentioned that at some point, these will no longer be serviced by Ford. What then for us SVT guys? The NAPAs and Autozones didn't cover our low volume application. Can a standard Countour PCM be reflashed to cover SVT calibration?

--------------------
silver '98 E0
bone stock except
225/60 -16's on 16 x 7's (45 et)


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FavoriteMystaque
Hard-core CEG'er

Reged: 10/17/04
Posts: 1456
Re: Wrap-up new
#1298851 (Re: cj leadfoot) 08/11/06 11:36 PM

Glad the PCM fixed it. Did your car have the PATS key?

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cj leadfoot
New CEG'er

Reged: 08/21/02
Posts: 13
Loc: Commerce, MI
Re: Wrap-up new
#1298923 (Re: FavoriteMystaque) 08/12/06 01:44 AM

Yes, it has the PATS key. If I understand an earlier thread correctly, later versions require the security system to be reprogramed at the dealer after extended absence of battery power. Not a problem for my humble E0.

--------------------
silver '98 E0
bone stock except
225/60 -16's on 16 x 7's (45 et)


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FavoriteMystaque
Hard-core CEG'er

Reged: 10/17/04
Posts: 1456
Re: Wrap-up new
#1299389 (Re: cj leadfoot) 08/12/06 11:09 PM

I have a 1998 Mystique with PATS, and it's an early 1998, if (when) I need a PCM it might be straightforward to replace.

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