Quote:
Originally Posted by dontlifttoshift
Apparently this is not the case. PWM does not work with the GMPP controller we have either. Yes, it is wired properly. Yes, I turned on PWM with HPTuners. No, the fan does not operate with PWM.
Temporarily wired a relay and switched back to discrete while I come up with a solution. Probably will go the same route as JP did and get a new ECM and rewrite the calibration over. I would like to find a better solution than that, if it exists. I have a couple of installs coming down the pipeline where I would prefer to use the PWM control and the GMPP harness.
Dear GM,
That's pretty stupid.
Sincerely,
Hot Rodders
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Donny,
Thanks for the confirmation. I was pretty sure that JP wasn't being a dumbass...
It would be nice to know if there was a change at some point with the GMPP ECUs. Clearly some early ones worked, while the later ones do not. It would be nice to know when the change over took place.
It would also be nice to know if the change is hardware, firmware, OS, or something else. Maybe GM is selling so many of the ECU harness packages that it was feasible to make a dedicated (lower cost) ECU? Seems pointless, but I can see some bean counter saving $10 per ECU by removing the PWM driver (or whatever it might be called).
Andrew