How do you test your TPS and IAC? I'm not talking about adjusting them, I mean how do you test them to make sure they're functioning before I do all the adjusting.

HEE HEE i said "test these" get it "testes":lala: :lala:

 

IAC isn't really testable, to my knowledge... adjusting it isn't really possible, either. You just kinda have to assume it's gone south when you're having an idle problem and it's over 5 years old..

TPS is tested during the adjustment process. Once you've got it adjusted to .54-.56 volts at idle, *slowly* rotate the throttle open while the voltmeter is still connected and watch the voltage output. It should increase steadily until it reaches over 4V at WOT. Then, slowly close the throttle from WOT back down to idle. You're looking for smoothness of voltage response (good).. when you're opening the throttle, the voltage should only increase. When closing, the voltage should only decrease. Look for repeatability of idle and WOT voltages, and watch for dead spots (bad).

 

if you can, use an analog multimeter instead of a digital one. the needle will show voltage spikes a lot easier than a couple of numbers. you need to have the tps plugged in and powered up (key in "ON" position), and connect the leads for the meter to the (i think) top and bottom wires on the TPS harness.

 

Thats pretty funny

 

If you happen to have a Fluke multimeter the bar graph below the digital numbers is twice as fast as the digital readout so always watch the bar graph but in reality if you have any small bad spots on the TPS most of the time a DVOM is not fast enough to see them, so if it checks good there is still a chance there might be a problem with it. A scope is the only sure way to test them