| Hardware interchange |
Subject: Hardware interchange by vis_croceus on 2007/12/31 1:05:08 ECM/PCM part numbers
Model Year GMpartNo Engine
Taken from this site: http://www.fuelinjection.com/portinj.html A note on interchange - the computer hardware is generally the same between different car lines, but the software is different. In particular, with the 94-95 PCMs you need to bench-flash with Y code before installing in the car. If you run the B/F code in the car you'll have trouble establishing communications with the PCM. This is probably because of communications conflicts between the CCM and the PCM, since the PCM is a master device in the F/B and a slave device in the Y. [One person reports not having this problem. YMMV] [Somebody else reported you can just pull the 2 fuses for the CCM then program the PCM. Haven't tested this myself] There are hardware differences in the 94-95 Y PCMs vs. the F/B, but they are only related to the preliminary/experimental OBD2 functionality and not relevant for vehicle operation. Common LT1 PCM interchanges OBD1 (94-95) <--> OBD2 (96-97) Putting a 94-95 PCM in a 96-97 car: use 94-95 knock sensors Putting a 96-97 PCM in a 94-95 car: use 96-97 knock sensors, and disable the CPS DTC. ECM (92-93) <--> PCM (94-97) Changing over to a later PCM will require a new injector wiring harness, and you should probably use the later intake manifold. Not sure if that's all that's required. |
