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no power to pcm

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  #1  
Old 12-26-2011, 12:03 PM
speedbanger90
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no power to pcm

#22 fuse and relay are good still no power any deas?
 
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Old 12-26-2011, 02:34 PM
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Well, fuse #22 is the PCM "relay" fuse which is usually the culprit. The actual power fuse that protect the PCM is fuse #9, 20 amp so check that one.
 
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Old 12-26-2011, 04:41 PM
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checked fuse #9 and it is good could the pcm fry for no reason going down the road? it died on me and #22 was blown i replaced it and havent been able to get a wts light and it wont start since i have checked all the fuses and the relay but i still cant get power to the glow plugs and it still wont start any suggestions would be appreciated
 
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Old 12-26-2011, 05:06 PM
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Unplug the fuel bowl heater and Check fuse #22 again
 
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Old 12-26-2011, 05:34 PM
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Got any codes? Got a chip in the truck?
 
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Old 12-26-2011, 06:01 PM
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Originally Posted by fordpride View Post
Unplug the fuel bowl heater and Check fuse #22 again
^^^^^^^^^^^^^^^^^^^^^^
 
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Old 12-26-2011, 06:01 PM
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If you have a chip & it fell out going down the road , it could well be an issue with the PCM .. Does the check engine light come on & stay on (kind of dim) ?
 
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Old 12-26-2011, 08:46 PM
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He has already done some of this. Here is a link to his other thread.

https://www.ford-trucks.com/forums/1...ter-dying.html

I am wondering if the PCM isn't fried. Has it rained lately where you are? You don't happen to have noticed water leaking in through the driver side lower corner of the windshield have you?

Only other thing you can try is to unbolt the wiring connector from the PCM and see how the connections look and probe right there for power.
 
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Old 12-27-2011, 07:45 PM
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it was raining the day it quit but the windsheild doesnt leak i have been trying to get a wiring diagram from ford for 2 days to find out what wire going into the pcm is the power i really need to get this truck running so if anyone knows what wire it is i would appreciate it
 
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Old 12-28-2011, 08:16 AM
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Try this one:



And here is the wiring legend:


According to the diagram, pin 71 should be a Red wire and that should be the power input to the PCM.

Hopefully this helps.
 
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Old 12-28-2011, 09:00 PM
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I got her runnin tonight after almost a week the powerwire going to the pcm had rotted in two good ol illinois roadsalt eats em up thanks for all the help guys I really appreciate it
 
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Old 12-29-2011, 08:21 AM
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Glad you got it going again. Gotta love road salt. Although I would take the salt over the brine solution the state has started using on the interstates around here. Nasty stuff.
 
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