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Road
February 5th, 2020, 01:05 PM
Anyone have a pinout to make a bench harness for a 99-02 Cavalier with P08?

Thanks
GMPX
February 5th, 2020, 01:41 PM
Pretty sure it is the same as the LS1B.
Road
February 5th, 2020, 04:11 PM
Pretty sure it is the same as the LS1B.
No it is different. Even has way less terminal pins. I have tried LS1B, V6 Buick, Northstar pinouts as they are all different too.
GMPX
February 5th, 2020, 04:21 PM
Yes it has less pins but the important ones are in the same spot.
The LS1B bench harness I have runs all those PCM's you've listed there, V6-P04, Northstar-P06, they are all the same pinout for bench connections (and of course E54 - LB7).
I just put a P08 on my LS1B bench harness and it works fine.

Blue 60 = Ground
Blue 20 = 12V Unswitched (Batt)
Blue 19 = 12V Switched
Blue 58 = VPW Serial Data
Road
February 6th, 2020, 12:24 AM
Yes it has less pins but the important ones are in the same spot.
The LS1B bench harness I have runs all those PCM's you've listed there, V6-P04, Northstar-P06, they are all the same pinout for bench connections (and of course E54 - LB7).
I just put a P08 on my LS1B bench harness and it works fine.

Blue 60 = Ground
Blue 20 = 12V Unswitched (Batt)
Blue 19 = 12V Switched
Blue 58 = VPW Serial Data

Interesting... I will try again and count the pins on the LS1B Connector instead of the ecm.

Oddly if I connect a V6 Buick to my LS1B harness it will blow fuses immediately. (Using a older Kent Moore bench harness)
Connecting to this Cavalier one and it back feeds power to the key on circuit.

EFI Connection sells a seperate harness for all these for this reason
23192
23193
Road
February 6th, 2020, 02:29 AM
My harness had to many wires. I simplified it down and works. You was right as normal... Thanks for the help.
GMPX
February 6th, 2020, 09:36 AM
I simplified it down and works.
Yeah that's the trick, those four wires I mentioned are common for all those PCM's that look like that.
Road
February 6th, 2020, 09:53 AM
Yeah that's the trick, those four wires I mentioned are common for all those PCM's that look like that.

After all that she is a end of the line ecm with unsupported calibration. Ha. Thanks again though
GMPX
February 6th, 2020, 10:01 AM
Probably a project that should never have happened to be honest, horrible PCM that one.
Road
February 6th, 2020, 10:06 AM
Probably a project that should never have happened to be honest, horrible PCM that one.

I never had the calls for them till recently. Local dirt tracks now have a class for these front wheel drive cars and becoming very popular.