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REALLY WEIRD ECU ISSUES

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  • REALLY WEIRD ECU ISSUES

    ok so, recently i had a problem where my alternator wasn't charging. car kept dying over and over.

    so i went to autozone and purchased an upgraded alternator from a mazda protoge and installed it.
    went to jump the car and the car runs 5 seconds and as soon as the jumper cables are disconnected it died.

    went through everything i could think of. no spark, no fuel (fuel pump worked) so i assumed ecu.

    found that when the battery + was connected the current from the battery dropped down to almost 2 volts from 12/13v.

    .......ok so pulled all the fuses until the troubled circuit revealed itself. turned out to be that the new alternator was dumping power from the positive to the frame through the new alternator.

    took it back and got it replaced. than replaced some of the stuff that failed. installed a new ecm and when i turned the key the ecu started to smoke.

    soooooo went and did a voltage/amperage check from the ecu loom supplying power and found that when i even connected the multimeter it not only got hot but the fusable links in the engine bay started smoking registered +10amps before i took it off.

    i have one more ecu but i do not want to blow it up.

    any ideas s to what might be causing this?

  • #2
    You have a dead short to ground likey through a melted section of harness after the links. It's either that or you have the battery backwards...
    Trees aren't kind to me...

    currently: 2 88Ls (Scrappy and Jersey), 88LX, 90L(Pepe), 91L, 91GL (Skippy) 93 GL Sport (the Mighty Favakk), 94 (Bruce) & 95 Aspire SEs, 97 Aspire (The Joker),
    94 Justy 4WD, 87 Fiero GT, plus 2 parts cars. That's my fleet.

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    • #3
      battery is definitely not backwards lol

      but i guess i will check that out. thanks again.

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