Does anybody have a trouble-shooting diagram for diagnosing a non functioning IAC motor ? System is MEFI 3 , on a 565ci with Whipple 3.3 . I have scan tool , no code . No movment when command by scan tool . trio of fuses OK . Tried different IAC IAC motor is typical GM 4 pin

heres a pin out of the ecu,,my guess,driver circuit has been damaged in the ecu.but,hoping its a broken wire

Thanks , that'll get me started !