20amp fuse in the black box under the hood keeps blowing. It is labeled ECM B. Iam told it is tied to PCM and VCM. After it blows the truck dies and when you turn the key back to the on position there is no fuel pump sound and the check engine light does not come on. After I change it everything is fine. A few days later with no warning it blows again. iam told it "might" be a short in the fuel pump itself but don't want to change the pump and find out this has been a problem and all it is, is a short in a wire somewhere else. Any experience or help with this problem? Thanx in advance
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the pcm is the computer.its located under the dash on the passenger side.you don`t say what if this is a car or truck.same thing applies but some are behind the glove box,which will have to be removed to see the pcm.you can get a book from the library or buy one so you will know how and what wires you need to check.
I have been around several mid 90's dodge vehicles that the fuse for Auto Shut Down blows for no apparent reason. When this happens the vehicle will crank but not start. The fuse is under the hood in a black plastic box and is labeled under the lid. Fuse costs about $5 at auto parts stores. Keep a spare in the glovebox. My father's 92 dakota did this until the ECM failed. After replacement the fuse never blew again.
another person wrote this, I was trying to find more info for you.
I'm answering my own post so other's may reference. The problem was my
Powertrain Control Moudle (PCM) kept blowing out due to a bad fuel pump.
so if you are inclined to check, your fuel pump can still work and not work correctly. So this needs to be tested under correct measures. More than likely on the truck. But I would locate the PCM and check to see if its blown.