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Thread: Delphi MT88 / e78 PCM Communication Tuning

  1. 04-20-2019 #1
    xx_ed_xx
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    Delphi MT88 / e78 PCM Communication Tuning

    I ended up with this pcm (see pics) running a fairly new big block. year model 2017.
    The very limited info I could find about this pcm seems it was also used on some GM crate engines etc.
    I am hoping to make an information thread. As well as a bench harness to read it "hopefully"
    Feel free to add info if you know anything about these pcms.
    Thanks
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  2. 04-20-2019 #2
    xx_ed_xx
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    No luck communicating yet, this is what I have tried on my bench harness
    J1-19=battery pos
    J1-20=battery pos
    J1-43=can low
    J1-29=can high
    J2-13=switched 12v+
    J2-28=switched 12v+
    J2-73= gnd
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  3. 05-23-2019 #3
    coryk
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    On my E78 pin 18 of J1 is switched B+ also
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  4. 05-23-2019 #4
    coryk
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    Also, on my schematic J2 pins 13 and 28 are switched on by the ecm itself by a ground grounding a relay through J2 pin 40.
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  5. 05-23-2019 #5
    coryk
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    And you're correct about the info on these. Not much out there.
    I also built a bench harness that seems to work.
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