[LGAFF]

Swapped ECMS in the 91 to the 90, in the 90 the Fans work when commanded by the Tech one .. odd.

1991
-fans work with direct power to the fan motor
-fans work in Tech one Diagnostic mode.... Testing ECM
*so we know relays, wiring, and fans are good
-Fans wont command on in the 1991w/th the tech 1 and wont come on at
205 degrees as they should
-TEch one command for fan test works on other cars with the same ECM

GC how does the sensor shut down the Tech One when its in a fan testing mode?