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Thread: ECM1 burned... causes?

  1. #1
    Fuel Injected! Xenon's Avatar
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    ECM1 burned... causes?

    I'm getting everything together to put TBI back on my '87 Subby... I've been thinking about what you guys said that maybe my ECM wasn't bad after all. I've thought of many explanations, but the thing I still can't explain is that when it finally died the ECM1 fuse was blown. I replaced it, the truck was still dead but it didn't blow again.

    What kinds of things could make ECM1 blow?

    I've been reading on this forum almost every day and have learned ALOT. Thanks for all the help.
    -Frank

    1987 GMC Suburban K2500 400SBC, TH400 Trans, 3.73 Gears
    1995 GMC Suburban K2500 454BBC, 4L80E Trans, 3.73 Gears

  2. #2
    Fuel Injected! PJG1173's Avatar
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    I would get the wiring diagram for your truck and back trace what circuits are hangin off of that fuse.
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 12" spring lift, 4.56 gears, F/R lockers, 36x12.5x15 TSL's, long tube headers, 266HR cam, p&p vortec heads, $0D Marine MPFI.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

  3. #3
    EFI GearHead ! EagleMark's Avatar
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    There's wiring diagrams for the ECM in the 1227747 $42 thread. But I don't know what ECM1 fuse in truck powers? It could power ECM and when ECM went bad fried fuse? Now you replaced fuse and there's nothing left in ECM to pop it again? Or could be power to EGR and sensors or injectors? There's lots of power to circuts then to ECM for ground or reading. Have to look at truck wiring and see what that fuse powers.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  4. #4
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    looking at a 87 suburban 3/4 ton 4WD with 5.7 diagrams...

    the fuse that the ECM uses for ignition on signal also powers the EGR/EVRV solenoid, the EAC solenoid and the ESC module.

    it might power more.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  5. #5
    Fuel Injected! Xenon's Avatar
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    Thanks. Will looks at the wiring and see what I find.
    -Frank

    1987 GMC Suburban K2500 400SBC, TH400 Trans, 3.73 Gears
    1995 GMC Suburban K2500 454BBC, 4L80E Trans, 3.73 Gears

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