Originally Posted by
ronniejoe
The PCM or Powertrain Control Module controls both the engine and the transmission (and senses engagement of the front differential). Therefore, it controls the entire powertrain of the vehicle. It's one box. There is no ECU or ECM separate from the PCM.
I didn't know that, thanks!! For some reason I thought there were two computers in play. So, when you upgrade to a Heath or other computer, it's the PCM you are upgrading?
This begs the question, if the PCM is not getting speed from the VSSB as stated above, where does it get it from? I'd think it would care for management of the transmission, cruise, etc.
Art.
Art Paltz
1999 Suburban K2500 6.5TD (stock)
2000 Undercover Dragster, 468 BBC, 7.74@173MPH, waiting on new 622 aluminum BBC to be finished.
1992 Tube Chassis Camaro, 468 BBC, 8.54@157MPH (SOLD)
1987 Buick Grand National, 11.8@114, pump gas (for sale)
1969 Camaro SS/RS 396-350HP, stock restoration, it never leaves the garage...