E40, E38 and E67 have ability to control PWM fan or dual discrete or ECM controlled engine driven fan output. All use AC pressure, oil temp, IAT, trans temp as well as coolant to control fan output. Can not mix and match fan driver type - must pick one.
Difference between discrete and PWM is you only have on or off with discrete - which is set to 50% and 100% output from fan cal. PWM drives the motor at whatever the percentage is based on the inputs.
If using the discrete outputs with dual electric, I prefer to set them as parallel / series control rather than have each fan driven by output. That way on 50%, you are driving both fans @ 50% rather than one @ 100%.
I hate listening to noisy fan(s) masking sound of engine - exception being when in track usage - where you NEED the fan output.
Dave
BTW - reason E40 & E67 were used in TBSS and H3 is vehicle communication was still Class 2 while Powertrain was CAN - E40 & E67 can handle both (E38 is CAN only).
Last edited by mikels; 10-29-2015 at 05:15 AM.
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