OBDII Code P1698

I am getting code P1698 on my scanner. The quadratec website lists two descriptions for this code:

P1698 No CCD/J1850 Message From TCM No CCD/J1850 messages received from the electronic transmission control module (EATX) or the Aisin transmission controller.


P1698 No CCD Messages Received From PCM Bus communication failure to PCM. A "Companion DTC" was set in both the ECM and PCM.


I get that there may be something wrong with my TCM or PCM. What exactly is the roll that a TCM plays with a manual 5 speed? How would I begin chasing this down?

Was the jeep an automatic trans converted to a manual?
VSS disconnected at t case  or a connector disconnected or loose at the trans?
Connector from fire wall wiring harness to trans faulty or loose.
One would ponder if there is an association between the banging the dash and the issue that you still have, two issues one source? especially if you did not have the issue before you worked on it.


Faulty or loose ground strap or wire between the engine and wiring harness under the hood.
Faulty Engine control Module (ECM)
- Engine control Module(ECM) harness is open or shorted
- Engine control Module (ECM) cicuit poor electrical connection
- Low battery voltage
Just trying to find a reason for issues since work has been done,,or something you did unknowingly.

As far as I know the jeep has always been a manual.

Last I looked the VSS is connected and there were no loose connectors.. I will double check though.

Maybe I will pick up a ECM at the junk yard today and try swapping it out.

Thanks

Could a bad ECM be causing my high idle issue?

This just happened after installing the header and it was totally ok before that ?

I actually am not sure if it was there before hand. The gauges didnt work and I tore the jeep apart the day I got it.

AHHH, well i'm sure that in the end you will get it fixed.
What rpm does it run at and does it change with time as it warms up?

well it WAS running at 2300 rpm. I just took everything apart again because I found 3 bolts the were juuust holding onto a thread and werent very tight. Helicoil time. Well see how things are running this afternoon when i finish.

So I got everything back together and started her up! Boom! 900 rpm idle! Sweet! I let it get to operating temp.. then it noticed a rough idle. It kinda pulsed. I ran a code and I am getting P0171. Lean running condition in bank 1. I know this is the upstream O2 sensor.. I have read it could be an exhaust leak or a dirty MAP sensor. Any other suggestions? I am looking into it this afternoon after work.

Can you put a scanner with real time data on it and check  if 02 sensors are working correctly.
Do you have an exhaust leak before the 02 sensors.

ummm im not sure. I just got my scanner and have not really played with all the features yet. I have a hunch there may be a leak at the collector gasket. First thing im gonna do is tighten the crap outta that and see what happens.

So a small update. I couldnt use my scanner to check the O2 sensors as far as I know.

I did notice last night that the surging/rough idle only happens when the engine is up to temp. Runs beautiful cold. So I did some research and found this thread:

http://www.jeepforum.com/forum/f11/help-rough-idle-after-warm-up-code-p0171-474214/

This is pretty much exactly what is happening to me. Off to pick up a O2 sensor today and see what happens. I am registering during lunch today so I hope all goes well!

Well, the O2 sensor did the trick. Runs beautifully now.

I am still throwing that P1698 code though. I wiggled the connections to the ECM and nothing. Could this be related to the CPS?

I need this CEL gone so I can get inspected on Monday!

What year is the jeep?
If it's over 15 years old it doesn't matter if the CEL is on as it only needs a safety inspection and is exempt from needing a emissions test.

1998 if that is true then I can breathe easy. Still a strange issue

1998 if that is true then I can breathe easy. Still a strange issue

That is what a friend of mine that owns a inspection station says.
He just gave me a sticker on one of my tj's that has the light on.
Where ever you go to get the inspection ask them first if that is an issue before you waste your time.
It should not be an issue if it's 15 years old or older as it is exempt from emissions testing.

1998 if that is true then I can breathe easy. Still a strange issue

Hopefully you can get one as it is. GOOD LUCK,

As far as i have heard that any vehicle 1996 to present needs to have an emission test done yearly. This is a federal law but some shops don't do it and use the 15 year rule. In Mass they are supposed to do the emission test yearly so like Mark stated check with the shop you go to for the inspection first. Get the rejection sticker if need be so you can drive it then you can fix it. I drove my old truck with a rejection sticker for 6 months before I fixed it. Hell I know people that drove their vehicles over a year with a rejection sticker with no problems.

My 97 just got a sticker with the CEL on and the inspector said it's over 15 years old and it only needs a safety inspection anyways so he said good to go and scanned the previous sticker and that was it.

Every year if (less than 15 years old) you get an emissions test.
Obd does not need to be accessed if it's over 15 years old.

Inspection info here. 1999 and newer OBD.

Cars, trucks and SUVs manufactured before model year 1998 no longer receive tailpipe emissions tests but fail their safety inspections if they produce visible smoke.

http://www.vehicletest.state.ma.us/motorist_basicinfo.html

excellent. Thanks all. We will see how it goes on Monday.