The current code goes away when I switch to off (normal) or high from low. I can also watch the QDM toggle from ok to bad on the scantool. Then it leaves the code in history.
All other data is perfect. It'* a phantom.
The high speed circuit is very simple, the low speed is a different story. The PCM actually watches the low speed fan relay for the proper voltage. I'm forcing it on when the PCM doesn't want it on. The other items the Quad Driver A module monitors are the Evap canister purge solonoid, the HIGH TEMP light, and TCC apply. Note that it does NOT monitor the high speed fan relay. Only the low speed is considered critical?
Quad B covers the shift solonoids and EGR valve.