PCM Failure..WTF?
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PCM Failure..WTF?
SO, after a very detailed diag it has boiled down to the PCM being bad, after a crank no start situation. All other systems verified and all systems go. (long story).
Now I’m on the hunt for a PCM to buy, but in the back of my mind I’m wondering what caused the problem? I know the answer is, “well....many things, who knows” but it’s still bugs me.
I think it boils down to a few things..And I’m looking for expert advice since this isn’t my area of expertise.
1. Aftermarket chip? (Did have one, what is the likelihood of it being what caused the problem?)
2. Fault in the wire harness (short)? (How do I verify the pins on the harness?)
3. Offending sensors or peripherals? Is this Possible? And where do you start looking?
If I put a new PCM in should I expect this thing to fail again?
I’m thinking of going with a DP tuner once this issue is all resolved.
Any help is appreciated.
Dazed and confused.
Now I’m on the hunt for a PCM to buy, but in the back of my mind I’m wondering what caused the problem? I know the answer is, “well....many things, who knows” but it’s still bugs me.
I think it boils down to a few things..And I’m looking for expert advice since this isn’t my area of expertise.
1. Aftermarket chip? (Did have one, what is the likelihood of it being what caused the problem?)
2. Fault in the wire harness (short)? (How do I verify the pins on the harness?)
3. Offending sensors or peripherals? Is this Possible? And where do you start looking?
If I put a new PCM in should I expect this thing to fail again?
I’m thinking of going with a DP tuner once this issue is all resolved.
Any help is appreciated.
Dazed and confused.
Last edited by 1Fastboy; Aug 28, 2012 at 08:21 PM. Reason: incorrect spacing
Senior User
Joined: Feb 2012
Posts: 223
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From: Baltimore MD
the pcm is a mechanical part,too. it does not spin, or move, but it is made up of components which can deteriorate or wear just like tires or brakes.It is afteral made from metal and subject to heat and vibration.
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I know there are multiple control modules. Do they report to the PCM, kinda like in a hierarchy? If so maybe this communication path is faulty causing the PCM to wig out...
Has anyone bench tested a PCM or looked at the software interface? Where is a ford engineer when you need one?
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Your right about that. Even still there would be a commonality among chip sets failure I would think. Physical damage fore sure but What about software? I'm not familiar at all on how it's set up in that sence. Perhaps Bios corruption or otherwise?
I know there are multiple control modules. Do they report to the PCM, kinda like in a hierarchy? If so maybe this communication path is faulty causing the PCM to wig out...
Has anyone bench tested a PCM or looked at the software interface? Where is a ford engineer when you need one?
I know there are multiple control modules. Do they report to the PCM, kinda like in a hierarchy? If so maybe this communication path is faulty causing the PCM to wig out...
Has anyone bench tested a PCM or looked at the software interface? Where is a ford engineer when you need one?
An aftermarket chip can cause this if it comes lose from the J3 service port while power is connected to the PCM.
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RIKIL,
Thanks for the heads up. I did have a chip in there from the previous owner. Now it's just sitting on the shelf. I plan on going with a DP tuner in the near future so ill have to make sure it's secure...
Thanks for the heads up. I did have a chip in there from the previous owner. Now it's just sitting on the shelf. I plan on going with a DP tuner in the near future so ill have to make sure it's secure...
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Let me know when you're ready to order. I'll be glad to help you out.
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Did you have to reprogram the PCM when you installed it? If I buy one with same part number, will I need to reprogram it? Thx
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Tuned
Joined: May 2017
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From: C-town,MD
That post was from 2013. But you should be able to just plug things in and have them work. No reprogramming necessary
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