Looks like it can be done as I stumbled across this video the other day doing some reasearch. It does not really explain how or what pins used. I would think you could look at this video and the Schematics for the PCM circuit to figure out how you need to hook it up.I'll ask the NOOB question since I plan on doing this with my ride, but the question: Can this be done on a bench with the PCM out of the vehicle?
As far as the OBD1 & OBD2, this is my understanding that the only differences that I'll have to take into account for when I tweak mine (OBD1 PCM Installed in OBD2 vehicle) is as follows:[SNIP]
As for confusing OBD2 LT1 , the question was brought up
My only point was ,
If you are going to build an LT1 bench top programming harness, the plugs are the same, why not make it do both ?
I am sure I am not the only one who messes with both "obd1" and "obd2" LT1s
Just thinking out loud here based on what you described about the knock sensors on a 95 bbody. Since the l and r sensors are tied together and assuming no mechanical engine issues, is it possible to remove 1 of the sensors and plug the hole in the block. I believe the Fbody cars only use 1 sensor.A 96 "B" bbody OBD2 , the left and right knock sensors are separate circuits , as opposed to 94-95 where they are tied together.
To run a OBD1 PCM in a 96 without hacking the wiring , or changing the Knock sensors ( this so you can pop the OBD 2 PCM back in at any time), you have to bridge the L+R knock sensor circuits inside the PCM and add a resistor to ground.
I have done this to a couple cars way back but when OBD2 tuning became available, it was pointless ,to me.
Plus with an Impala, you have to deal with the tach output being different ( think you might be able to do with software now , as opposed to the little circuit that was added.
Where I live, the 95 cars had to be sniffed and dyno'd for emissions, the 96 were just plug in test.
Another Huge reason to leave OBD2 intact, for me.
Understand now .
Ok, I will delete my of track posts and answer others questions offline