PCM power train control module.
ECM engine control module
When the module also controls the transmission, frequently called a PCM.
That PCM was used from 1992-1995 on cars. Had seen a few on trucks until 1996.
I was using Tuner pro to view and compare data.
Used a DOS GME PRO editor to edit the bin file. Tuner pro had a few glitches in it's conversion file for that PCM 1992-1993 3800SC.
Found GME to be very error free as an editor. I had contacted the writer of the program. He had gave the conversion file that he had. He was surprised that I had contacted him, being that he had not had anyone have interest in it for so long.
I am using ST 27csf256 EEproms. Savana Wellem programmer. Reminds me, I will have to freshen the solder joints on the prom adapter I made.
Yes it is true that this PCM is not as editable as ODBII. No detail for editing Volumetric efficiency. However were able to edit injector volume, timing table, maf table, shift points, road constant, RPM and MPH fuel cutoffs, code monitor flags and more. That PCM also has a port for a performance switch. For normal or performance modes that were available for the Bonneville SSEI.
Now this would not be enough for track times, but worked fine for what I wanted out of it.
Also I own or have access to the following. Snap On "brick", Tech 1(yes A GM Tech1), MAC ODBII/and earlier scanners. The Tech shows more manufacture data than the other 2. With a few pass through functions that I have never seen on pre ODBII scanners including the Snap ON.
There was a lot of self made parts. Alternator brackets, engine and transmission mount brackets, I had to fabricate. Had to remake alternator brackets 3 times. First for the Series 1. Then for the Series II SC. And again for the N/A.
Don't get me wrong. There was a lot of work getting it to all work. Not for the faint of heart and not for someone with little mechanical experience. But I made it work with what I had. Had to use 3 different wiring diagrams to get the harness right. Mitchel diagrams for 1993 Park Avenue Ultra, 1993 Bonneville SSEI and of course 1985 Fiero GT. I decided to use the Fiero cruise control so I could keep the wire count down at the PCM. The PCM has 2 VSS outputs 1 for the speedo and 1 for the cruise. Oh by the way, I'm using a digital dash from a 1987 Cutlass Calais. Works with all the outputs from the PCM (tach speedo)and all of the analog sending units from the car. No BCM needed.
The PCM works well with the 2005 ignition module and coils. Ignition wiring is the same from 1992-2005. Did have to use the 1998 injectors. The only failure I have had in the last 40,000 miles was the fuel pump. Can't say that this set up is the most tunable, but has been very reliable. The techs I work with at first were skeptical. But watching me use it every work day for the last 5 years, with so little break downs, they don't question it. Have jumped in it and drove 1000 miles non stop except for fuel and pee on a good number of times.
Best set up,nope. Hard to piece together, yes. Will it work reliably, yes
[This message has been edited by cmechmann (edited 02-13-2020).]