WHY DOES MY ECM-A KEEP BLOWING OUT?

  • Tiny
  • soto404
  • 1999 Chevrolet Truck
  • 303,000 miles

I have a 1999 Chevy 3500 v8 2wd and my ECM-A keeps blowing out. I already changed out the fuel pump fuel relay and fuel filter with no luck. So what can it be. Thanks so much.

Saturday, March 24th, 2012 AT 10:49 PM

10 Answers

  • Tiny
  • rasmataz
  • Member

You sure its the ECM-A fuse instead of ECM-1?

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Saturday, March 24th, 2012 AT 10:58 PM
  • Tiny
  • soto404
  • Member

It's either one.

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Saturday, March 24th, 2012 AT 11:02 PM
  • Tiny
  • rasmataz
  • Member

You have a short circuit between the fuse to the computer-could be the pink wire is shorted directly to ground or one of the injectors is shorted out and dragging the rest down

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Saturday, March 24th, 2012 AT 11:13 PM
  • Tiny
  • soto404
  • Member

Thanks

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Saturday, March 24th, 2012 AT 11:19 PM
  • Tiny
  • rasmataz
  • Member

Your welcome

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Saturday, March 24th, 2012 AT 11:21 PM
  • Tiny
  • djcl
  • Expert
  • 786 posts

You will need to check all ecm oup puts. If the resistance of a solenoid is to low it will pass to much current and take out the ecm driver on that circuit. Was the truck running well before the first ecm failed?

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Saturday, March 24th, 2012 AT 11:54 PM
  • Tiny
  • soto404
  • Member

Yes the truck was running well before the first ECM failed.

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Sunday, March 25th, 2012 AT 12:19 AM
  • Tiny
  • djcl
  • Expert
  • 786 posts

How did you determinethe first ecm was bad.

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Sunday, March 25th, 2012 AT 12:26 AM
  • Tiny
  • soto404
  • Member

The fuse for ECM 1 was burned out and it didn't want to start anymore.

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Sunday, March 25th, 2012 AT 12:34 AM
  • Tiny
  • djcl
  • Expert
  • 786 posts

Is it still blowing the fuse and when does it blow? As soon as you stick it in or when trying to start it or just turning the key. Are. Are you shore the ecm is bad or maby a fuse problem?

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Sunday, March 25th, 2012 AT 12:42 AM

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