P1698 PCM fault no CCD message from TCM


wyodan59
10-12-2007, 01:04 PM
I can't find anything in my manual about this fault code. Does anyone know what is involved with this fault. This is on a 1997 Plymouth Voyager with a 3.3, w/4speed trans. As of now If I remove the negative battery terminal it turns the mil light off. And all seems to be ok.

RIP
10-12-2007, 11:52 PM
If the service engine light comes back on with the same code you have a problem in the wiring between the TCM and the PCM or the TCM itself is bad. CCD is the data bus the computers talk to each other on. For some reason the TCM isn't sending required data to the PCM. I can't find much info on how to troubleshoot. I would say if the wiring shows continuity and the connections are clean and tight, you may need a new TCM. Scanning through threads on the forum, it appears fixes range from loose connections to replacing entire wire harnesses to bad TCMs. Read a couple that implied bad solder joints on the instrument cluster or replacing the cluster itself fixes it. I'd have to research that a bit.

PCM = Powertrain Control Module <> It's a computer that controls engine functions <> Located on the drivers side fender wall outboard of the battery
TCM = Transmission Control Module <> A computer that controls transmission functions <> Located on the passenger side fender wall

What symptoms are you seeing besides the service engine light?

EDIT

wyodan59
10-16-2007, 09:54 AM
Sorry for the delay in answering. I have been working way to much. The only thing that happens is the trans will not go into gear or after the first braking it will act like it jumped to neutral. If I rev the engine several times it will take off. sometimes it will need to be put back into park, reved up and put back into gear and it will go. once it goes the second time it will not do it again. It appeares to only do this when the trans is cold on a first start. As soon a I can keep my wife out of it long enough, while I am not working I will inspect the cable from tcm to pcm. I will let you know what is going on. Thanks One other thing. sometimes the tac and the speedo will not operate. this is intermitent not sure it applies???

wyodan59
10-27-2007, 12:54 PM
Hello again. I removed the plug on the tcm. put it back on securely and inspected the wiring to the pcm. Hooked the battery back up the light went out and now for about two weeks the light has not come back on. don't know if the tcm plug was loost or if wrestling the wiring from tcm to pcm changed a connections some how. Hope not to see the light again. Thanks for the help.:wink:

RIP
10-28-2007, 01:08 AM
Wow! That's great news. If you see it again try cleaning the contacts on the connections with electrical contact cleaner. Most auto parts stores have it or try Radio Shack. For now, and I'm sure you're in agreement, I wouldn't touch anything. Thanks for posting the fix.

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