no power to pcm..pcm is good all fuses good - Ford Powerstroke Diesel Forum
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Old 11-13-2011, 03:47 PM
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no power to pcm..pcm is good all fuses good

hey guys been trying to get this truck back on the road.. 7.3 is getting no power to pcm...pcm is good swapped it with a buddys truck.. all fuses are good even unplugged the fuel heater switch.. no wts light but cranks..still nothing..
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Old 11-13-2011, 07:37 PM
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Curious as to how you know there is no power to the PCM? Can it crank if the PCM isn't involved in the process? Don't know, just asking to make sure you really don't have power to the PCM.
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Old 11-14-2011, 05:51 AM
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It will crank all day without a PCM, just not gonna start

Next, you should ALWAYS post your yr/mdl when asking for help...

Without a WTS and your swap it does sound like it's a power issue. Thing is, they're All fused so, and I don't mean to insult you here , but in 99% of these cases it IS a fuse!

You have to Triple Check, use a meter (or light) on Both sides, pull them out, wiggle them around, REALLY give everything a close examination.

Fuses #19-30-22 are among the most likely, I'm sure there are others that supply power also so, check 'em ALL.

Another thing can be the fusebox itself, a previous owner might have jammed one of those fuse-tappers along side a fuse and bent the "clip" inside so it now doesn't grab the fuse well.

Also, do you have a chip or tuner installed? a problem there can prevent the PCM from running, take it off as a Test.

Do you have any other things that aren't powered like they're supposed to?
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Old 11-15-2011, 04:10 AM
huj huj is offline
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check diode in the fuse box
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Old 11-15-2011, 04:25 AM
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NoRalPhh is right. He knows this stuff.
And if there's no WTS light, no power to the PCM, then there's a good chance it's still that fuse that powers them and the fuel bowl heater. Pull it out, look at it, and still put a new one in for the heck of it.
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Old 11-16-2011, 02:55 PM
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^^^^x2........
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