Pin functions determined by PROM?

[Jeremy Gonyou]

The check engine light wasn't on was it?  This sounds an awful lot like 
back-up fuel mode.  I run auto code in my manual (93 3.1) with no problems.

Jeremy


>Can a PROM change the function of the input pins on the ECM?  Last night
>I dropped in a PROM for a 3.1 auto into the 7730 for my 2.8 5spd, and I
>noticed a few odds things happening.  It seems that the VSS doesn't get
>to the ECM, causing stalling problems on coasting and DTC 24.  I can
>possibly understand this because the PROM was designed for an auto, but
>it also can't read the A/C pressure transducer, so no A/C demand nor
>clutch control, either.  I dunno how it would have handled the lack of a
>digital EGR, but since the VSS never made it above zero, I'm guessing
>that I would not have have found out.

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