Originally Posted by maximum
Thanks guys, but I don't have either one, thats why I was asking on here ! Thanks anyway
The TPS is simply a potentiometer used to vary voltage. The best way to check the voltage is with a scanner, but if you do not have access to one, you can use a DVOM. You can probe the terminal (not the wire) with a needle, or paper clip to check voltage. The TPS GREY wire, is the PCM reference signal and should measure 5.0v with ignition on. (Engine does not need to be running) The BLUE wire will show variable voltage from a closed TB position, usually .45v, up to WOT, where it should measure between 4.0v to 4.2v max. The BLACK wire is ground. BTW, this thread started with a discussion on a 1999 TPS, and now has gone back to 1992!