Quote:
Originally Posted by kdracer73
The diagrams found don't show a fuel tank sensor, but some do show a leak detection pump.... Evap self testing was pretty new in 96. All the info I found from Chrysler is vague. Some vehicles had leak detection pumps and some didn't, even in same model lines. Most early evap self tests used other sensors to check evap operation. The pcm would look at MAP ( manifold absolute pressure) and look for a change in manifold vacuum when the evap solenoid opened. Some systems would look for O2 sensor enrichment readings as the solenoid opened.
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After spending an hour under the car looking for a pressure sensor in the tank, then searching... a lot for a PCM diagram to see if it had a hook up for it, I just saw the hook up for the leak detection sensor. Just 30 seconds before I read this I was wondering if the Cherokee used it in lieu of a tank pressure sensor.
So thats the answer I take it? Ug, should have just sent you a PM. Ha