QuestionQUESTION: hi roland - i bought a diagnostic tester and came up with 1 stored code which said "no ccd j1850 message from tcm/pcm p1698" can you guide me in the right direction on my 1998 town and country 3.8 eng - i can't thank you enough on all you help over the last few days - i'm hoping to fix this today - family getting cabin fever - thanks greg
ANSWER: Hi Greg,
The CCD wires connect from the TCM plug pin 4 to data link plug pin 11, and from TCM pin 43 to link plug 3. The link plug is where you plug your code reader. You could check the continuity of those 2 wires. The other digital wire is between the TCM pin 7 and the PCM plug pin 65 would be another to check for continuity. Aside from a lack of continuity the 'fix' according to the manual is to replace the pcm (though I wonder why it wouldn't be to replace the tcm?). If you have no issue with the transmission's function I would leave well enough alone. Perhaps if you had a more elaborate device to plug in to the link you might get a more specific instruction. But that is what I can find in the manuals.
Roland
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QUESTION: hi roland - to make sure i am ck-ing the right items
ccd is the red connector on the top of the dash
tcm is the one under the dash just below the fuse / relays
pcm is on the left fender area
if i am not correct can you tell me which is which
as far as the trans goes it still revving to 4k just driving around town with the PRNL all lit up
do you think i may just have a bad cluster - i called a junk yard and they have it for $100 but non refundable
thanks greg
ANSWER: Hi Greg,
No the CCD 'bus' is the collection of twisted wires and modules which communicate between themselves over those wires (includes the tcm, pcm, bcm, cluster, overhead console, airbag controller, etc.). I merely identified the twisted pair of wires that are at tcm plug because that is the part of the bus system that isn't getting its signals to the data link connector under the dash by the steering column according to the code reader. The tcm is the controller on the right inner fender. The controller under the dash behind the fuse box is the bcm (body control module). While your problem could be the cluster, the 1698 code says that the digital info that the tcm is generating is not seen at the data link.
Now that you tell me you are in trans 'limp in' (the symptom of not shifting out of second gear) suggests that you do have an issue with transmission communication rather that with the cluster. The thing I don't understand is that the manual speaks of a solution to the 1698 problem lies with the pcm (located as you said on the left inner fender).
As to the cluster, you could try unplugging it and see by chance if the trans operates normally then.
So check the 3 wires I have listed. If those are continuous,
then I would suggest that you check the power supply (does it show )12V) to the tcm as well as the ground wires of the tcm plug as follows:
The TCM plug's wires to check are:
tcm pin: connects to: wire color: purpose:
8 starter relay(outboard pin) yellow ignition switch (start)
11 fuse 2 in dash red/white ign. sw.(off-run-start)
51 pcm 43 black/light blue sensor ground
53 chassis ground black/yellow power ground
56 fuse 15 in pdc red/dark blue fused 12v
57 chassis ground black/red power ground
Shake the harness while checking each of these for a possible loose connection as well as a frank 'open'. If all that checks out:
Then you may want to change out the pcm or the tcm. I can't guarantee which will correct the problem, unfortunately, or that either will.
Roland
PS Thanks for the kind words and nomination.
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QUESTION: roland thanks to your help - the problem was under the hood it was the 3rd 20 amp fuse for the xact wasn't making good contact as soon as it did - i heard a click - and everything worked fine - now we can enjoy lobor day - thanks greg
AnswerHi Greg,
Right! That is what supplies 12v to pin 56 of the of tcm as well at to the tcm relay output. You would have found 0v on pin 56 due to that loose fuse. It not only powers the trans module but also the solenoid pack's switches. Thanks so much for telling me the resolution of your probems. I am pleased you stuck with it and solved this at no cost by your efforts.
Roland
