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Thread: repair an 8051 PCM

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  2. #32
    Fuel Injected! steveo's Avatar
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    oh also make sure the ecm has been booted up for a little bit (30 secs i think?). before flashing

  3. #33
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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; 01-25-2020 at 06:41 AM.

  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?

  9. #39
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    Quote Originally Posted by kur4o View Post
    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?
    The cable I am using is also used on my 1990 corvette with a clean signal. I am putting the pcm back into the car to burn as it's the only way I have to connect and power it. I have an extension cable to power the laptop to make sure it doesn't run out of battery.

  10. #40
    Fuel Injected! steveo's Avatar
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    it really sounds like the chip to socket to board connection might be imperfect
    are both eehack and tunercat/winflash producing the same error

  11. #41
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    haven't tried tunercat yet but I will absolutely check tomorrow to be sure I have good contacts within the socket.

  12. #42
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    Any luck with the bin splitter steveo?

  13. #43
    Fuel Injected! steveo's Avatar
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    nah haven't worked on it yet sorry

    i'll probably be more motivated when my test bench is running again

  14. #44
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    Quote Originally Posted by steveo View Post
    nah haven't worked on it yet sorry

    i'll probably be more motivated when my test bench is running again
    ok, I was finally able to get my pcm working again. Not sure if positional or the chip but the last iteration flashed both sides without a single error so I'm going to leave it alone as long as I can.

  15. #45
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    Steveo I was watching a video on youtube about building a 16bit ecu and saw them using an arduino to record the address and data sent to in and out of the ecu. Because we have access to the memory chip is this the info you need for the bin splitter?

    The arduino I have only has enough ports to give you address only but knowing the order they write should allow us to match to the locations used. I'll see what I can do this weekend to replicate what I saw.

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