PWM cooling fan(s) control using ECM

[dontlifttoshift]

Originally Posted by mikels

While there has been several 'releases' of calibrations for the LS crate engines, the software has remained the same.

So enabling PWM fan control is matter of wiring properly and enabling in calibration.

Dave

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,
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