I just recently got a CE light coming on occasionally on my '90 Galant GSX. Turns out the TPS is having problems. It only happens when the car is warm and the throttle is all the way closed (i.e., I'm giving it no gas). I checked the resistance on the TPS and it seemed good - about 4.5 kohm across the outside pins; it must just change a bit outside of specs once it heats up or something. I didn't check the supply voltage, but the TPS seems to work fine except for all the way closed.
At the junkyard I didn't find a similar DSM, but there was a '91 Dodge Colt (with a Mitsubishi engine of course) that I pulled a TPS from. I haven't checked yet if it'll fit in my car -- does anyone know if it will work on my 90 Galant GSX? The part I pulled is EWT-F2A 1312. The overall setup seems the same. Thanks for any help.