Hi Brian,
Your Hpt COS is based on 12212156 OS used in a 12200411 PCM. It looks like you should be able to use one of the fan control circuits. Usually we turn a fan on at a set temp, then turn off when it goes to a lower set temp, plus it might need a rpm reference signal to activate. I'm not sure what happens when those values are opposite of normal. The 12212156 OS does have EGR as well as AIR pump settings, however from memory it seems like the '0411(red/blue) doesn't have those driver chips on the main board that the earlier 9354896(red/blue) has. I could be wrong, it's been a while since I was looking at the differences. Good Luck
p.s. I built an encoded 24x/1x signal generator for RPM as well as everything else to be able to run the PCM on the bench with LED's and such. However, the suck is, I have no spare time. You can build all the stuff you need for testing but it can be daunting :(
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