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Tuner
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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Tuner
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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Tuner in Training
On my E78 pin 18 of J1 is switched B+ also
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Tuner in Training
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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Tuner in Training
And you're correct about the info on these. Not much out there.
I also built a bench harness that seems to work.