cab3143
Forum Newbie
Posts: 1
Reg: 08-23-10
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08-23-10 03:00 PM - Post#1965651
I have a 1999 GMC Suburban and My ECM-1 Fuse keeps blowing. Thursday I was driving to the store and all my gages fail the right and my engine shut off. I had to have it towed to my house. The ECM-1 Fuse was burnt, so i changed it. However, now when I turn my switch to on the fuse blows. I don't even have to turn the switch far enough to crank the engine and the fuse blows. What could be wrong.
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redvett01
Senior Member
Posts: 1133
Loc: Grayling, MI
Reg: 10-23-03
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08-23-10 06:08 PM - Post#1965793
In response to cab3143
Check everthing on the ECM 1 circuit its in the wiring diagram in the FSM. Could be the PCM,injectors or wiring.
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Randy_W
None
Posts: 27804
Reg: 01-06-02
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08-23-10 07:43 PM - Post#1965861
In response to cab3143
Almost definitely a short, has the truck been in deep water or super heavy rains or anywhere the connectors or PCM could have gotten wet? If not look for exposed wires making contact with a ground source or another circuit.
Randy
DON'T mess with Old Men, we didn't get old by being, STUPID!!!
"The veneer of civilization is very thin!" (Arlo) |
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 wagonman100
Super Senior Member
Posts: 12998
Loc: Baltimore, MD
Reg: 11-27-04
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08-24-10 04:10 AM - Post#1965954
In response to Randy_W
I agree with Randy. It is a short somewhere. You'll have to get a wiring diagram to trace the related harnesses. It could be an internal short in the computer itself or a broken wire going to ground. The first thing I would do is unplug the computer and turn the key to the on position and see if it still blows a fuse. This will tell you if it is something that is on the computer harness or the computer itself if the fuse does not blow. If it still blows, then it is something that does not get power on that harness. The gauges failing first may be a clue as tot he culprit, but I am not that familiar with our trucks in that regard.
Jay
Some days it's not worth chewing through the restraints.
1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon |
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ratnfested
Valued Contributor
Posts: 2916
Loc: Rochester, NY. USA
Reg: 03-13-00
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08-24-10 07:45 AM - Post#1966053
In response to wagonman100
check for chewed injector wires.
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