Hello,
I cannot access the transmission control unit on my S-Type, Model 2002.5 with 3.0L engine. WDS shows a communication error with the TCM. There is no warning light or anything similar and it shifts and drives (almost) properly. As far as I understand, the TCM is working and it is also communicating with the ECU. Otherwise it would not be able to shift properly? The voltages on the transmission connector are all OK, as is the CAN BUS. So the problem must be with the communication from the OBD socket to the TCM (which, according to my information, only runs via the CAN BUS). So today I wanted to test the OBD connector myself using the WDS (WDS - control module communication network - diagnostic connector - comprehensive test). It wants an external power supply (which it gets) and then the red test tip connected in order to measure pin 16 on the FC001 (OBD socket). It expects around 12V, but only measures between 0.078 and 0.1 V. With a normal multimeter it has 13.7V (extra power supply to maintain voltage is connected to the battery). The WDS measuring cable seems to be OK. The WDS multimeter also measures 13.7V directly on the OBD connector (PIN 16).
Now I need help. Is the WDS making an error during the OBD test or is there actually a problem with the socket? I had already discovered errors in the WDS on my XK100. When reprogramming the key, it wanted the ignition to be turned off at certain points, but only worked correctly when the ignition was on. And that makes me wonder if the WDS is making a mistake? What can I do?
Thanks and regards, Willi

 

Are you getting any bad shifts (gear changes)?

Does the Sport button work as you'd expect?

Also, does using the J-Gate to inhibit gears work?

Which other modules can your WDS see on the CAN bus?

 

Hello,
no, it shifts up and down cleanly. The sport button works perfectly. The J-Gate also works. All other control units such as ECM etc. are found and displayed.
I do have a problem with the automatic transmission, however (and that is why I would like to perform a TCM reset): When gliding at around 60 km/h with very, very slow acceleration to 70 km/h, it wants to shift up one gear, but then it doesn't. A little more or less accelerator position and everything works (without error messages)


Addendum:
I just remembered that I use the Ford measuring probes C201/C202. I have changed the entries for the measuring probes in the (Windows) registry so that they work with the Jaguar WDS. Could that be the error? I would like to test it. Can someone please tell me the registry entries for the Jaguar measuring probes?` They are in the registry under HKEY_Local_Machine\Software\GenRad\System\Probes
BlackProbe= ??? RedProbe=???
Regards, Willi

 

The TCM is just another module on the CAN bus so it's hard to see how the probes can matter since you can see other modules.

If the trans had been misbehaving I'd be thinking it could be its connector but as it behaves OK I don't know what can be wrong.

Two common(ish) things for the trans are the shift cable securing bolts being loose/missing and a leaking sleeve for its electrics but you don't appear to have anything wrong relative to those.

Maybe you can borrow / get access to another OBD tool? Many can at least provide some info about modules even if just the module's CAN address or Cal Id or what PIDs it supports.

 

Hallo,
I also tried testing with another diagnostic device and IDS. The transmission control unit is never recognized. I will check the idea with the test cable and the incorrect registry entries. Do you have the correct registry entries?
Regards, Willi

 

I don't have a working WDS or IDS currently and no idea what may be in the registry.

 

Too bad,
maybe someone else can read the entries for me?
Concerns registry entries under
Regedit.exe
HKEY_Local_Machine\Software\GenRad\System\Probes

Greetings, Willi

 

Hello,
I reinstalled the WDS to read the original values Original:
Black Probe: 2A8
Red Probe: 098
For the Ford probes, the following entries must be made in the registry so that you can measure with them.
Black Probe: 125C
Red Probe: 3e8
This might help someone.
Regards, Willi