My 1994 GMC suburban keeps blowing ECM/Ing fuse .

Sounds like a short in the circuit to the injectors. Does it blow the fuse if the injectors are unplugged ?

There is excessive current draw in the ecm for this to happen. I suspect that the ecm has an internal short. If you can get it checked that would be the way to go. If by chance you have had a jump start prior to this then it will be the ecm unit.

ecm1 is injectors not fuel pump ecm-b is fuel pump its more likely to be a faulty relay for the injectors, it would be a similiar design to this
this is for the fuel system, relay for the injector is nearly the same.

For the ECM 1 fuse to open you obviously have a short to ground , start with the injector disconnected and see if ECM 1 fuse still blows.If it does disconnect crank sensor, also inspect wires for the injectors or any rub through wires here is a diagram

i have a 95 gmc suburban that keeps blowing the fuse when break is aplied i even disconected the back lights and it does the same what could it be

The key is to find out what is causing the ECM fuse to always blow. With just the key on try and see if any codes are set in the ECM. If not, try a new ECM. If the fuse still blows, then disconnect all accessible electrical for everything, including radios, accessories, relay boxes,etc. except the ECM. If the fuse still blows, then probably something wrong with the wiring to the ECM. If it doesn't blow then start hooking up things one at a time until it blows again. Once it blows, that is your problem.

Scroll up and LISTEN to the guy talking about a SHORT. That's what it is. Take off the air cleaner assembly. Lift all the wires up and off the engine, pull the big wire loom a half inch out of the hole it disappears in going through the firewall. Keep doing this until the fuse stops blowing. Took me ten seconds. I still don;t know which wire it is, but I am buying some rubber fuel line and/or wiring loom protector to insulate everything off the valve covers, etc. Be sure to pick up extra 15 amp fuses in case it happens again, and be ready to tell anyone who drives the thing what to do.

Case: 1990 GMC 1500 SLE Suburban. Ran just fine, then the ignition shut off when I hit a random bump or pothole. Cost me a $750 tow before I got on here and did the wiggle test. The fuse stopped blowing. I will update if my fuel line/insulation idea didn't work, but I think it will. I will also tape every exposed wire with electricians tape. . .

check the oxygen sensor wires for damage i hd som rub on anxle in a dodge neon, it had the same effect.

Hello,
Yes, it may only require a new PROM chip. Ask your local parts store if the 5.0 and 5.7 are the same ECM and or PROM.

I hope this helps.

Roy

the system has a short circuit, check for a broken wire