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Thread: repair an 8051 PCM

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  3. #33
    Fuel Injected!
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    Quote Originally Posted by steveo View Post
    your aldl comms might be sketchy, but is it throwing any DTC errors?
    no codes that I can see.

    Quote Originally Posted by steveo View Post
    oh also make sure the ecm has been booted up for a little bit (30 secs i think?). before flashing
    I will try to let it sit for a little bit next time.

  4. #34
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    Letting the pcm "boot up" made all the difference. One thing I am noticing, one of my chips keeps hanging at the same address. Is this likely a failing chip? I am also seeing data breaks while data logging, this proceeded the first crash.

  5. #35
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    so its crashing at adress 2D80 on 2 different chips. I am going to try another bin but is there a way to burn the bin directly to a chip or is the bin we use to revive a chip just pulled from a living chip?

  6. #36
    Fuel Injected! steveo's Avatar
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    yeah it’s pulled from a living chip
    ill build a converter soon
    i have a new 8051 ecm coming thanks to a really awesome eehack user
    ill backtrace those stupid address lines and eehack will be able to spit out a bin in the either format in like 0.5 ms

  7. #37
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    That would make this soo much easier. I had this stupid thing crash 5x today trying to update a spark table.

    so cant get it to take a tune now. Looks like I'll be driving to corvette for a while
    Last edited by space387; 1 Day Ago at 08:41 PM.

  8. #38
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    Quote Originally Posted by space387 View Post
    That would make this soo much easier. I had this stupid thing crash 5x today trying to update a spark table.

    so cant get it to take a tune now. Looks like I'll be driving to corvette for a while
    I have seen similar behaviour with bad cable. The flash goes smoothly till some point, when the cables freaks out. Also a PC or laptop crap power supply can totally destroy usb communication. And the last reason is not enough current or low voltage supply. Are you trying to flash on a bench with some shoddy power supply?

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