More updates! So over the weekend, I finally got around to replacing my upstream sensor before the cat. I immediately noticed a smoother idle, and the OBDII test that was failing previous now passes. However, I now have a new "NOT OK":



According to this site, this is related to O2 bank 1 sensor 2. Great! I guess I shouldn't have been cheap and got the second sensor too. That is now on my list of things to do...however, I'm not sure how trustworthy this information is--it shows that the previous $11 test is "Absolute Throttle position sensor" for Mode 1, which is what I believe the CID $01 is referring to.

Helpful link: http://www.outilsobdfacile.com/obd-mode-pid.php < this site has some good information on OBDII data. The problem is, all the research I'm doing comes up inconclusive with little to no concrete information on what these PIDs and CIDs are. They seem to be manufacturer-specific. Anyone know where to get a Chrysler spec sheet on this stuff?

And just for kicks, here's my realtime data screen. Thermostat is workin pretty darn good!

 

Hmm... I may be missing something here, but how can you be applying 15% throttle and your revs are only 700?

 

I have no idea.

*crickets chirp*

Come on, doesn't anyone else dig this deep into their Jeep's ECU? lol

 

Haha, I plug mine in every now and then and have a mess, I don't exactly understand a lot of the output nor do I understand if my own figures are normal or not.

I use the same layout as you so will have a look and see if mine does the same.

 

Yes, please do! I'm sure your data might be a bit different with the propane conversion, but definitely interesting! I wish more people used this app and OBD connector though. There are plenty of threads on them, but not on what the data actually means in the results and otherwise. That's what I'd like to see this thread evolve into...people posting their test results, and getting everyone's input on what the TID/CID values really mean.

 

Absolutely! When I bought mine I searched CF for similar posts on translating the data and understanding my output but found nothing. I hope too for this thread to evolve. Count me in!

 

...and on that note... Here is what sensors are supported from Jeep's pcm:

 

I also fail this test:



Now to figure out what this means.

 

That's great! I haven't seen this screen, I'll have to find it next time I'm fiddling with it.

My XJ is running so good now, that I'm not too concerned about it and could chalk it up to a miscalculation/inconsistency with the adapter's readings (I've heard some of them can have sketchy output). Nice to see I'm not alone, though!

 

Ah, I have just noticed yours failed on the same thing. Yep, certainly not alone!

I'd like to see some live data posted of 'a normal journey' and see if I can compare the output. What sensors/values do you think should be monitored for this to happen?

 

How accurate is that app? If it is pretty close I am going to get it.

 

If I'm honest, I don't think the app is either accurate nor inaccurate. The app simply presents data from the PCM to us humans in a nice readable format. The app will simply display whatever the PCM tells it to.

For what it's worth, I think it's well worth the money. Hope this helps.

 

I think the area of weakness with it all rides on which adapter you choose. I've seen where some of the cheapo eBay adapters sometimes provide misinformation. The one I got from Amazon has been great as far as I can tell. It shows consistent data, and the temperature readings are spot on, and revs, etc as far as I could tell.

GO GET IT. It costs around 30 bucks for the dongle, and the Torque Pro app.

 

I might see if I can make this happen. Now that I know what the Jeep ECU supports, I think the important ones would be O2 sensors and temp sensors...hmmm

 

I'm just reading your build thread since we have the same Jeeps. I saw you were about to sit your ccna. I work in IT too. I'm up to page 7 now so not found out how you got on yet.

Looks like we have the same rust issues in the same places too. Your 'rust warrior' status made me read your project and I figure I need to learn how to obtain the same status

I'll have a mess around with my logging too and see what I can get. I'm trying to get the auto upload feature working so I can automatically upload that journeys logs