"D. Barry Stubbs" wrote: > > Can a PROM change the function of the input pins on the ECM? > VSS > A/C pressure transducer > digital EGR Yes, the I/O pins for all these items are determined by the PROM. -- Ludis Langens ludis (at) cruzers (dot) com Mac, Fiero, & engine controller goodies: http://www.cruzers.com/~ludis/