Question about 2003 Chevrolet Suburban 1500

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I have a 92 suburban the ecmb fuse blows as soon as i put in a fuse

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The power wire is going to ground check around the exhaust manifolds for a melted wire and the back of the heads

Posted on May 10, 2010

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1989 Chevy Suburban K1500 5.7 wont start. New fuel pump, inline filter, coil,plugs,cap n rotor,battery


You hear the new fuel pump kick on correct? While someone is cranking can you verify spark?

Nov 04, 2015 | Cars & Trucks

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1991 suburban


get a new car,,,,,, thats what im doing6_4_2012_6_49_14_pm.jpg

May 10, 2010 | 2003 Chevrolet Suburban 1500

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Ecmb fuse blows as soon as i put in a fuse without keys in the ing.


hi, i have seen this problem before, i am a trained ase mechanic who works in a shop weekly. in my case, the suburban was a 91, it started by blowing the fuse randomly, then as it got further along, the ecm b fuse would blow consistantly as you describe. I found the problem to be in the wiring harness between the fuse block and the electronic control module on the pink/black power wire. It had become hot next to the radio and the insulation had melted into a direct ground to the ecm. then as time passed, it melted six other wires till it hit battery power. this is when it shorted the fuse all the time with key in or out. You should start by checking behind the glove box at the wiring harness going into the ecm, if you can get a schematic for the wiring, it would be better advised. See if you can find the Pink and black stripe wires(there maybe several of them as they power everything from egr solenoid to oxygen sensor possibly) and look for melting of the insulation. If you do find this to be the case, technically you should replace the whole harness, but it is possible the cut and splice in new wires. If any other wires are affected, you should replace these also. Check the whole length of the affected wires, they may have shorted all the way up or down. If this sounds like a big deal, it is! so, good luck, hope this helps.

May 10, 2010 | Chevrolet Suburban 1500 Cars & Trucks

1 Answer

Will not start and checked fuel pump no power to fuel pump i also have blown fuse for ecmb that blows as soon as i replace it


ECM B fuse supplies a constant 12v hot at all times to the VCM/PCM and to the fuel pump relay. The fuse is blowing telling you that there is a short to ground somewhere. Try this, take the fuel pump relay out and put a new fuse in. If it doesn't blow put the relay back in and if it blows then try a new relay. The relay may be shorted to ground internaly. Other wise you'll have to trace the wires to the VCM and the pump relay to look for a chafed wire that's contacting metal. The wire coming from the ECM B fuse is orange and has a splice in it going to the pump relay and the VCM/PCM.
Hope this helps.....Andrew

Mar 28, 2010 | 1999 Chevrolet S-10 Pickup

2 Answers

Keep blowing the ecmb fuse in my 1991 s-10


check your grounds & the fuel pump connections.the ground should run to the right rear of the motor. look at the wires back to the motor on the frame for anything that may have nicked a wire or a rub thru. You have a short and i belive it shut down if you hit a bump. loose or fraid wire some place. Best of luck & keep us posted on your fix.

Mar 10, 2010 | 2000 GMC Jimmy

1 Answer

FUEL PUMP RELAY LOCATION


Fuel pump relay should be in the under hood fuse box. going to be a small relay about 1x1/2 long.

Oct 03, 2009 | 1995 GMC Safari

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No power to fuel pump and the ecmb fuse bows as soon as i put it


Unplug all wires to the distributor, coil, fuel pum and injectors, then see if the fuse blows, if it does, sounds like an ECM failure.

Sep 26, 2009 | 1993 Chevrolet S-10 Blazer

1 Answer

Ecmb 1


i had the same problem on my other 'burb ('90 2wd with same engine).
after dropping the tank ( about 5 miles after i filled it up!) because i thought the pump had cooked, i figured out the fuse had popped, and kept popping occasionally after that. i re-ran the wiring to the fuel pump, and this fixed the problem.
i checked the old wiring for any short/break in the wire, as there was not any visiable signs of a short, but still couldn't find anything concrete to say "this is where the short was!". but, it didn't matter, since the replaced wiring never gave me an issue and i didn't have to replace another fuse again! good luck brother.

Dec 16, 2008 | 1991 Chevrolet Suburban

1 Answer

Blows fuses


Generally speaking, a fuse 'blows' because too much current is drawn through that circuit. In this case I suspect a 'short-to-ground' or a bad voltage regulator (inside the alternator in a GMC). First, I would check the alternator's output voltage. Easiest just to look at your guage. Up to 14 1/2 volts is normal on a GM (with truck running), if it's higher - you need a new alternator. If it's under 14 1/2 volts, you
MUST find the short. Unless you have the specialized tools, (short-circuit finder, voltmeter, wiring
diagrams, etc.) this should be left to a competent automotive electrical shop. It could be as simple as a wire's insulation worn off or a short 'inside' the ECM (you truck's engine control computer). No matter what, one trip to a competent mechanic will probably be cheaper than continually replacing the computer and/or towing bills. Good luck!

Nov 24, 2008 | 1992 GMC Sonoma

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