it is direct to io on chip only thing in between on the line is a resistor it checks ok. One thing it the fan don't read on fan 2 connector either somehow internally they are on same io or it blew more in the cpu then I first assumed. I solved my problem with a batch 4 mini fan I had to replace the controller of course the new one I hooked the fan to fan2 and built a variable fan simulator with a LM555 and variable 5k resistor and a 1.0uf capacitor. I set the simulator for 6000 rpm and it is fine with the exception of the temps not reading right so I still have the fault light. No biggy it is up and going at almost 16k/sol. To lower the fan speed I removed the PWM line from the board and tied it to ground thru a 100k variable resistor done on the fan side not board side