1996 Jeep Grand Cheorkee TPS question

[hoofan]

Since I have been having the same intermittent problem for weeks now, I thought I would do some probing. Today I cheked the MAP and the TPS for starters just because they were easy to get to.

The MAP checked out good in accordance with my Haynes manual at 4.5 volts.

However, the TPS read normal with ingnition on (0.2 to 0.6 volts) mine read right at 0.6 volts. But when I open the throttle, I can only get it to go to 1.5 volts or so, which I should be able to get it to 4.5 volts wide open. I get the RPM up to 3-4K and only 1.5 to 1.6 volts.

So, I think the TPS is bad, but why am I not getting a 24 code?????

Should I just trust my measurements and change it anyway.

(By the way, the 5.0 volts from the PCM is good)

Thanks for the help.

Bryan

[Pintle]

I recently thought I had a TPS problem on my '96 JGC, so installed a new one. But that didn't change the 2 - 3 upshift delay problem I was experiencing. So, I measured the voltages. Had 5 volts from the PCM. With both new and old TPS installed, I got .6 volts closed, and 3.9 volts full open. I don't know why I didn't get 4.5 volts as the spec says. I returned the new TPS to the store. My problem turned out to be the Throttle Valve Cable Adjustment. The spec says to precisely align the cable end to the attachment stud but that allowed the cable to have slack in it, I guess from being stretched with time. I adjusted the cable to have a very minor tension at closed throttle, and my shift problem went away. Good luck!

[hoofan]

I tried opening the throttle under the hood and wit the gas pedal and got the same results. I guess I can change out the TPS and see what happens. I would just think that I would see something higher than 1.6 and get a code if it were low, but who knows??

Bryan