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Hi, have you done any highway driving? Cat and 02 usually go through at the same time at a steady highway speed.
Does California require all of the monitors to be set? In PA on a 2000, I think you can have 2 not ready and it will pass emissions. Either way, a decent scanner will show you what the global disable is if you have access to a decent scanner. That's a JTEC pcm and they're usually not hard to get the monitors ready. If you go into catalyst monitor pre test on that scanner, it will tell you if there's a global disable.
Global disable is a reason why a monitor will not run like you said earlier hi/low temp, fuel etc. JTEC (Jeep truck engine controller) is the 3 connector pcm that should be on that jeep. There's no way to manually change it to yes, we need to find out if there is a global disable keeping that cat monitor from running. Task manager function in your scan tool should tell you what if any global disable. Just out of curiosity, what's your baro reading? High or low baro could be a global disable. close to sea level, it should be 29-30.
The global disable is a reason for a monitor not running like low/high fuel, temp etc. If your scan tool has cat monitor pre-test, that will show you the operating conditions needed to get the cat monitor to run. It will also beep constantly to let you know when those conditions are met on a chrysler DRB 3 while its in those conditions.
Its steady speed above 40 mph. Like I said earlier, cat and 02 usually pass under the same conditions. Look for pre tests on your snap on scanner. If it has those,it will show you which parameters need to be met for it to pass the cat monitor while you are driving and what's in and what's out. If it doesn't have pre tests, the best advice I could give it drive it at a steady speed on the highway with the fuel level higher than 1/4 tank and lower than 3/4 tank.
98 kpa converts to 28.9 inches of mercury so that's about normal if youre close to sea level. id say slightly above sea level with that reading if that's correct for where you are. you'd really need a scanner with pre test capability for me to help you further. we need that cat pre test screen to see whats in and whats out of the parameters while driving it at a steady highway speed,
I don't know if snap on scanners have that function or not. I would think a higher end one should. Like I said the DRB3 and our newer scanners like witech and star scan have them. Maybe try going to a dealer and try talking one of the techs and see if they'll take a ride with you with a DRB3 for a few dollars...The pre test screen is what you need to see to find out what is inhibiting that monitor from running. It's under OBD2 monitors in our scanners if that helps any.
Sorry, I'm not that familiar with snap on scanners. I work at a Chrysler/Jeep/Dodge dealer and we have factory scan tools here. I tried my best to guide you where to go as far as getting to those pre test screens. That will tell you what is keeping the monitor from running.
these shots are from Witech but the DRB3 has similar screens with the enabling conditions.
here's further down that screen