Bad PCM?? Need help! - Ford Powerstroke Diesel Forum
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Old 10-09-2013, 03:48 AM
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Bad PCM?? Need help!

I have a 95 PSD, automatic. The problem is it won't stay running. It will fire right up, and purr like a kitten, then It will start lopeing very hard and die. It does have a TW 6 position on it. 6637 filter and 5 inch straight exhaust. The truck has been down for a while and really need it running again. I put a brand new fuel pump, CPS, cleaned FPR screen and nothing helped. Took it to a mechanic and he told me the PCM was bad. Could it be something else I'm overlooking? The Chip was on it when he checked the codes, so I took it off to see if that was the problem, but no dice. Any help would be appreciated, thanks.
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Old 10-09-2013, 05:22 AM
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I would be suspicious if the idm a good scanner and someone that knows these should be able to determine one or the other


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Old 10-09-2013, 05:23 AM
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What was the basis of the bad PCM diagnosis? What device was the mechanic using to try to communicate with the truck?

How does it run with the chip removed? Not just set to stock, but _removed_?
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Old 10-09-2013, 05:27 AM
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I have wondered about the IDM also. How would I go about checking it?
I'm not sure what scanner he was using. I think he said it threw a P0605 code.
Yes I unhooked the chip, don't have a stock setting lol
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Old 10-09-2013, 07:36 AM
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Have you checked for burned wiring harnesses under the valve covers? Pull and clean the IPR? Those are the first two things I'd do.
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Old 10-09-2013, 11:01 AM
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I just fried my own PCM so I have become a little knowlagable on this topic,

Since the truck is starting and running even for just a short while I'd say your PCM is okay, if its not then it may just need a re-flash. The PCM communicating with the scanner is another give away that the PCM is okay, have you tried unplugging the ICP?
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Old 10-09-2013, 05:46 PM
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I haven't checked under the valve covers yet, but I will, hopefully this weekend. What is the ICP again? Where is it located?
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Old 10-09-2013, 05:52 PM
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Injection Control Pressure Sensor. On the driver's side head, near the front. Disconnecting it causes the PCM to "default" to 500 PSI for HP oil pressure. Also inspect the connector and sensor when you disconnect it. If you see oil, that means the sensor has failed mechanically, and is leaching oil into the connector. Clean wire connector with electronics cleaner and replace sensor.
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Old 10-10-2013, 07:04 AM
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Quote:
Originally Posted by madpogue View Post
Injection Control Pressure Sensor. On the driver's side head, near the front. Disconnecting it causes the PCM to "default" to 500 PSI for HP oil pressure. Also inspect the connector and sensor when you disconnect it. If you see oil, that means the sensor has failed mechanically, and is leaching oil into the connector. Clean wire connector with electronics cleaner and replace sensor.

Even if the connection is still clean the sensor could be bad like mine was, try running the truck with the ICP unplugged and see if it fixes your issues and if it does then you know the sensor is bad
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Old 10-10-2013, 11:38 AM
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^^^^^ Keyword is "if" -- not the same as "only if".
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