exactly. I have an 06 s type r. Fought a comm problem exactly the same. Replaced all 8 coils and plugs with oem denso. Problem solved. The tcm can and will pick up slight misfires the ecm wont and shut off comms on the can network. Mine did the same thing in park. Give it a quick throttle punch and got restricted performance

 

Thanks for that chaps, can anyone link the right coil pack please, I'm on SNG Barrett and can't figure out the right unit

 

Hi again! So two coils were bought, swapped out for two aftermarket units and the car went from throwing the error on start up and jumping into restricted performance to running and driving ok-ish. I went to pick it up today, drove it, it felt week midrange on acceleration in 1st. I felt like it was slipping? That make sence? Then as I tried to overtake the car jumped out of 1st, with a bang! Then into restricted performance again until I pulled over, turned it off, refuelled and restarted. I drove back gently to the garage... Can anyone help please? New box? It's sealed yes? So can it be oil or still electrical do you think ?

 

That "sealed for life" nonsense that both JLR and Mercedes Benz peddled to their owner base is a load of rubbish. The service interval for your ZF autobox is 60K/5years. Use of the proper ATF is mandatory when servicing your transmission. It also sounds like once a service is performed, a proper reset of the adaptations and running-in is needed.

 

Hi, thanks for the info. So a service is doable on these boxes? Do you have any pointers please? I've done the box on a series 3 and thats the strength of my knowledge! And will a service stop the car jumping out of gear and clear the code. And how is that linked to the coils and small misfires triggering the restricted performance code?

 

Hi Flappers,

I'm sorry to hear the car is still misbehaving. Again, we need all diagnostic trouble codes. You've replaced a lot of parts, and we need to know which issues have been resolved and which remain, including any new ones since you began this sojourn.

Cheers,

Don

 

Hi again, the error code is the same. P1643. That is the only fault code recorded now. The vacuum leak has been fixed, all that remains is the box problem.

 

A transmission service is your first and least expensive step in getting your ZF 6-speed transmission sorted. It is wise to replace the electrical connector sleeve at the same time. In your case, after the fluid change, a reset of the transmission adaptations and proper drive-cycle would be prudent.

Good luck!

 

Have you checked the transmission electrical connector for ATF contamination? P1643 indicates a CAN communication problem or possible ECM or TCM failure. See post #19.

Are you certain there are no other DTCs? A Jaguar with only one code is rare. I would be very surprised if there aren't any U-prefix (Network) codes stored. Can your scan tool read U-codes?

 

I'll ask him, could this explain jumping out of gear?I did have a park brake code come up and it wouldn't engage.

 

Can anyone tell me if a service will fix the car slipping and jumping out of gear please?

 

It is quite possible, if not likely, that a full transmission service will resolve the slipping. I can't say whether it will resolve jumping out of gear.

In terms of the transmission service, I recommend that you: replace all fluid with correct new fluid (Ford Motorcraft Mercon SP or ZF Lifeguard 6), replace the pan/filter with an OEM part (ZF/Filtran), replace the valve body seals (bridge seal and 3 tubular seals); replace the pan/filter screws with the updated screws that take a larger T40 Torx bit; set the fluid level correctly at 40°C per the ZF procedure. It also helps if you clear the transmission adaptations so the Mechatronic can more quickly learn the friction/slippage/viscosity characteristics of the new fluid.

NOTE: There are two different heights for the valve body bridge seal. Be sure you purchase from a seller who knows the difference and will supply you with the correct part. One authorized ZF parts dealer I trust is Klaus Malenke at The California Transmission Supply Company (thectsc.com).

If the above service does not resolve all problems, you could try updating the Mechatronic firmware to the latest version (probably dated sometime in 2005), but this requires Jaguar-Land Rover Symptom Driven Diagnostics (SDD), a suitable interface cable, and the necessary update files. The update resolves many harsh shifting issues, but I do not know if it will resolve jumping out of gear.

Cheers,

Don

 

That's really helpfull Don thank you!