ECM fuse keeps blowing??
Thread Starter
Instructor
Joined: Mar 2005
Posts: 120
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ECM fuse keeps blowing??
I have an 86 that died and would not start so I went through the whole routine of checking fuel, spark, ignition module ect, then noticed I wasnt getting a SES light so I checked the ECM fuse and sure enough it was blown. After putting a new fuse in it started and ran fine for about five minutes the died. Blown fuse, now it blows them within seconds. IS this a bad ECM or what could be causing the fuse to blow? Thanks
Burning Brakes
Joined: Jun 2004
Posts: 752
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From: richardson tx
i dont know about an `86 but my `90 has two 12v and one ignition on, running to the ecm the manual shows which number they are at the ecm plugs. maybe you could put a meter on each one at a time and see what their doing. could be an ignition problem.
Thread Starter
Instructor
Joined: Mar 2005
Posts: 120
Likes: 0
I was kind of thinking it was going to require a little time with the meter and manual. I was kinda hoping for one of those easy "I know what the problem is" type of answers
every now and then I get those and saves lots of time. Thanks guys.
every now and then I get those and saves lots of time. Thanks guys.
Melting Slicks
Joined: Jul 2003
Posts: 2,384
Likes: 124
From: Reno/Sparks Nevada
I'm going to take a wild guess here. It's hard to tell what the fused power wire that goes to the ECM toggles on the ECM output leads. I do know that there are several relays like the fuel pump relay, fan relay, etc. that rely on a either a 12 volt signal or ground from the ECM. I have seen many relays where the wiring has shrunk back from the connector exposing the various leads to each other. These exposed leads could be shorting together and may be a source of unexpected grounding or power to the ECM. This is just a wild guess. I don't have my FSM in front of me, but I thought I'd just throw this out there for thought...
Art
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