| Re: 96 PCM to cluster communication question |
Subject: Re: 96 PCM to cluster communication question by bogus on 2012/5/3 0:28:02 I am back! Here is the complexity... The CCM is expecting data in some format. I am not sure what that format is, but it is expecting it. It is some kind of data stream. Could it be binary? ASCII? EBCDIC? Something else entirely different? Who knows. I don't. The scanners are reading data FROM the CCM, but that is already translated into an ASCII data stream. What this means is as follows: You would need to be able to translate the data from the aftermarket controller into a language that the CCM will understand. That is the trick. So you need to know what the aftermarket ECM is doing and what the GM CCM is doing and make the two agree upon something. It also means that the signal has to be right, not just is it the right data, but is the data carrier signal correct. Is the voltage right, speed... you name it. It would be a pot load easier to do quality, accurate aftermarket gauges than it is to keep the CCM. At the same time, you can go old school - 1989 - keep the ABS system, but lose the ASR. Short of running the existing ECM as a piggyback, simply to read sensors, I don't know how it can be done. At which point the ECM would need to send to the CCM the following: TPS IAC MAT/MAF VSS RPM Everything else, including DTC's, would have to be turned off. Exciting, eh? If you are looking at an aftermarket ECM, take a close look at www.eficonnection.com. These guys are doing full on LSx ignition systems on old school Gen1 and Gen2 motors. |
