"CATALYST INCOMPLETE" Reading on OBDII.?????? All suggestions welcome..... - Jeep Wrangler Forum
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Old 08-17-2014, 07:04 PM   #1
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"CATALYST INCOMPLETE" Reading on OBDII.?????? All suggestions welcome.....

Just had a real quick question and any suggestions would be so greatly appreciated.

My husband an I purchased a 1998 Jeep Wrangler TJ, we live in Indiana, where emissions testing is required to be plated, and it passed everything except the Catalyst is reading incomplete. I feel like we've tried everything when it comes to the drive cycles but it just doesn't seem to want to run that self test and complete itself.
Any suggestions?

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Old 08-17-2014, 08:44 PM   #2
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If it won't ready after driving the heck out of it then you need to replace the catalytic converter.

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Old 08-17-2014, 09:17 PM   #3
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Or the O2 sensors.
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Old 08-17-2014, 09:28 PM   #4
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It takes 40 good "trips" after all diagnostic trouble codes have been cleared (or fixed) for the smog system to be ready for testing. A trip is is essentially a cold to warm drive cycle and it takes 40 of them before the OBDII system is considered ready for emissions testing.

This is what the Factory Service Manual says about about getting it to the point where the OBDII system is "complete" and ready for testing...

It can take up to 2 Failures in a row to turn on the
MIL. After the MIL is ON, it takes 3 Good Trips to
turn the MIL OFF. After the MIL is OFF, the PCM
will self-erase the DTC after 40 Warm-up cycles. A
Warm-up cycle is counted when the ECT (Engine
Coolant Temperature Sensor) has crossed 160F and
has risen by at least 40F since the engine has been
started.
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Old 08-17-2014, 11:09 PM   #5
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Or the O2 sensors.
If it's the O2 sensors, wouldn't a code of some sort come up? or is this not always true? Asking only because there are zero error codes showing, only the "incomplete"message is showing.

Driving the heck out of it, we've been doing. Do u have any suggestions when it comes to order of operations??? Or certain routine way that we should maybe try driving?
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Old 08-17-2014, 11:15 PM   #6
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Originally Posted by Jen1575 View Post
Just had a real quick question and any suggestions would be so greatly appreciated.

My husband an I purchased a 1998 Jeep Wrangler TJ, we live in Indiana, where emissions testing is required to be plated, and it passed everything except the Catalyst is reading incomplete. I feel like we've tried everything when it comes to the drive cycles but it just doesn't seem to want to run that self test and complete itself.
Any suggestions?
Have you tried disconnecting the battery, then run the test. Do you and your husband know the specifics of the cycle to complete catalyst testing?
(Specifics= specific cycle of engine @ idle/driving @ specific speeds/rpm to complete different emissions testing). Some of them are hard to duplicate or complete, have you tried a different testing center.
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Old 08-17-2014, 11:41 PM   #7
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It takes 40 good "trips" after all diagnostic trouble codes have been cleared (or fixed) for the smog system to be ready for testing. A trip is is essentially a cold to warm drive cycle and it takes 40 of them before the OBDII system is considered ready for emissions testing. This is what the Factory Service Manual says about about getting it to the point where the OBDII system is "complete" and ready for testing... It can take up to 2 Failures in a row to turn on the MIL. After the MIL is ON, it takes 3 Good Trips to turn the MIL OFF. After the MIL is OFF, the PCM will self-erase the DTC after 40 Warm-up cycles. A Warm-up cycle is counted when the ECT (Engine Coolant Temperature Sensor) has crossed 160F and has risen by at least 40F since the engine has been started.
That's excellent information to know. Thank you. And I guess we'll have to start the cycle over. Seems like a never ending process to get this plated that's for sure. And anytime u undo the battery, you do have to start the cycle count all over again correct??
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Old 08-17-2014, 11:48 PM   #8
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You can still pass the indiana smog test as long as you show a recipt for repairs and fail 1 previous attempt because of redadiness monitor, do the treadmill test and your tailpipe emissions meet spec. Heres a link to specific indiana code. http://www.in.gov/legislative/iac/20...84FNA.xml.html
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Old 08-18-2014, 07:35 AM   #9
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That's excellent information to know. Thank you. And I guess we'll have to start the cycle over. Seems like a never ending process to get this plated that's for sure. And anytime u undo the battery, you do have to start the cycle count all over again correct??
Yes, so I wouldn't recomend d/c the battery. Was the Jeep serviced when you bought it resulting in the code?
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Old 08-18-2014, 09:06 AM   #10
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Not that I'm aware of. As far as I know, it sat for at least a year. Runs great everything seems good it's just that darn reading. And I did d/c the battery in hopes to start fresh. But if it needs that many warm starts to get the test to run, that's such a disappointment, especially if we were probably close to that before I disconnected. Haha. Well, go figure. Thanks for info, I appreciate it, and We'll give it a go.
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Old 08-18-2014, 09:12 AM   #11
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Hmmmmmmm..... I have lived in Indiana for almost all of my 45 years, and I have never had to pass an emissions test to plate a vehicle. Why do you have to?
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Old 08-18-2014, 11:55 AM   #12
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Not that I'm aware of. As far as I know, it sat for at least a year. Runs great everything seems good it's just that darn reading. And I did d/c the battery in hopes to start fresh. But if it needs that many warm starts to get the test to run, that's such a disappointment, especially if we were probably close to that before I disconnected. Haha. Well, go figure. Thanks for info, I appreciate it, and We'll give it a go.
Disconnecting the battery would clear any past DTCs that were stored. The 40 trip self reset is place to clear any past codes that are not recently active, not unless you clear them manually. In some states, documentation is needed before erasure of dtcs.

In emissions testing any past or stored DTCs have to be addressed to start. The "Catalyst Incomplete" is one of a few tests that is part of the OBDII system that test real-time functionality. If these tests do not complete, it could either be the tech or your system is weak/failing. A DTC may not even be present for you to fail.
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Old 08-18-2014, 04:33 PM   #13
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It takes 40 good "trips" after all diagnostic trouble codes have been cleared (or fixed) for the smog system to be ready for testing. A trip is is essentially a cold to warm drive cycle and it takes 40 of them before the OBDII system is considered ready for emissions testing.
This is total BS. Both my 02 and my 06 will clear all of the emissions tests in 2 days tops.

I would replace all of the O2 sensors (both upstream and downstream) with mopar brand sensors. If you still get the code, replace the cats.
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Old 08-18-2014, 07:48 PM   #14
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You can still pass the indiana smog test as long as you show a recipt for repairs and fail 1 previous attempt because of redadiness monitor, do the treadmill test and your tailpipe emissions meet spec. Heres a link to specific indiana code. http://www.in.gov/legislative/iac/20...84FNA.xml.html
Awesome. I wish they would've just offered to run that dynamometer test in the first place. So frustrating. Knowing this has nothing to do with emissions in the first place. We're not polluting the air in anyway whatsoever.
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Old 08-18-2014, 07:54 PM   #15
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Hmmmmmmm..... I have lived in Indiana for almost all of my 45 years, and I have never had to pass an emissions test to plate a vehicle. Why do you have to?
Apparently Porter County is one of the, I believe, 4 counties required to take it. Ridiculous rule if u ask me. I can drive about ten minutes away to Lake or Laporte county, and not have to take it there. But obviously, I'm a porter county resident, who has to abide by Porter county rules. This doesn't even have anything to do with any sort of air quality issue either. That's the worst part. Pay extra for a 30 day temp. Plate for extra time to correct this problem and it's not even an issue when it comes to air quality. So aggravating.
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Old 08-18-2014, 07:57 PM   #16
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You can still pass the indiana smog test as long as you show a recipt for repairs and fail 1 previous attempt because of redadiness monitor, do the treadmill test and your tailpipe emissions meet spec. Heres a link to specific indiana code. http://www.in.gov/legislative/iac/20...84FNA.xml.html
This is awesome info. Thank you so much. Now why couldn't they just offer to run the dynamometer test in the first place instead of stressing me out about it, purchasing a 30 day temp plate, and worrying because it's still not resolved yet. Such crooked money hungry people. Bunch of bologna.
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Old 08-18-2014, 08:42 PM   #17
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Have you tried disconnecting the battery, then run the test. Do you and your husband know the specifics of the cycle to complete catalyst testing? (Specifics= specific cycle of engine @ idle/driving @ specific speeds/rpm to complete different emissions testing). Some of them are hard to duplicate or complete, have you tried a different testing center.

Unfortunately, were not allowed to go to a different county. And this is the only one here. No other options, so no choice.
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Old 08-18-2014, 10:18 PM   #18
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Apparently Porter County is one of the, I believe, 4 counties required to take it. Ridiculous rule if u ask me. I can drive about ten minutes away to Lake or Laporte county, and not have to take it there. But obviously, I'm a porter county resident, who has to abide by Porter county rules. This doesn't even have anything to do with any sort of air quality issue either. That's the worst part. Pay extra for a 30 day temp. Plate for extra time to correct this problem and it's not even an issue when it comes to air quality. So aggravating.
Hmmmmm.... I never knew that. I know Indiana used to have inspections state wide back many years ago, but I did not know we still had some counties that still do it. Learn something new everyday, I guess. Well, good luck, and I hope you get it figured out soon!!!!

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1998 jeep wrangler tj , catalyst , emissions , help needed , tech help

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