Question about 1999 Ford Super Duty F 450

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Pcm fuse keeps blowing - 1999 Ford Super Duty F 450

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: pcm fuse keeps blowing and van won't run

sounds like dead short....would look at wire diagrahm to see what ground is hitting a hot wire...maybe alternator,starter, fuse block....ect....

Posted on Jun 25, 2010

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SOURCE: 1998 Ford Sindstar PCM fuse keeps blowing

check the relay of ur ford

Posted on Jan 25, 2011

  • 946 Answers

SOURCE: 2001 Ford taurus #22 fuse (A/C clutch relay PCM

Remember that when you THINK the AC's off,it's really not.Almost all cars have the AC compressor actuate every time you set the dial to `defrost' or `mix' positions.
On a TAURUS there are only two positions(maybe three)which DON'T kick the AC on.On some cars,that's the 11 o'clock and 2 o'clock positions on the selector.

SO...........the odds are that the compressor magnetic clutch or wiring to it has shorted.Because you really have power going there even when you think you don't. (:^) don-ohio

Posted on Oct 30, 2011

emissionwiz
  • 78289 Answers

SOURCE: 2002 fordranger pcm fuse keeps blowing

You have a shorted wire in the system. Try this, disconnect the fuel injection connectors to the engine one at a time and see if the short goes away, then look at the wiring in that connector and try and locate the shorted wire.

Posted on Jul 16, 2012

  • 1 Answer

SOURCE: 1995 ford ranger pcm blowing

I would disconnect the computer and put a new fuse in and see if it blows again. if it does not blow then the short is in the computer if it does blow the fuse with computer disconnected then the short is in the harness let me know what happens

Posted on Apr 19, 2013

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1 Answer

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It's possible you ran the battery down, trying to start? Have to make sure battery has a full charge and battery connections all good. If battery is down, have to use a charger and get it charged, we can't test anything if battery is down.
I did look at power distribution wiring diagram for your vehicle, I found pcmB fuse--20 amp. Two fuse legs goes to pcm, the other goes to load side of fuel pump relay. If I had to guess, I'd say the fuel pump has a problem. If the wiring before the fuel pump relay or the pcm was the problem, then the fuse would blow as soon as soon as you plug it in. The fuse circuit shows to be hot all the time. Just my opinion. There might be other issues, but, I can't track it from where I am.

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