Quote:
Originally Posted by JackandJanet
I don't know what to check either. Sounds like the system thinks you have e-fans, but you don't show that you do. I don't think there's any kind of monitoring for the clutch driven fan.
- Jack
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Ford changed stuff on the engine fans, starting ~2006 or 2007. Even though the fan is driven by the water pump pulley as before, the clutch is controlled by the PCM. And it appears to be more than just on/off control. Looks like the PCM outputs PWM (pulse-width moulation) which controls how much the clutch locks up, which in turn controls the actual speed of the fan. It's a closed loop system because the fan then has a sensor that reports its RPM back to the PCM. There's DTCs for when the PCM commands the fan clutch to engage and but doesn't see an increase in the reported fan speed.
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2007 F150 XL, 4.6, Regular Cab, Gryphon Installed 2/2009
"voiding warranties since 1979"
