hello to all,

Since last Oct 2012, I've had the "Gearbox fault , restrictive performance" message appear several times. the first time it was about tcm being flashed .
Car worked fine . I stored it for the winter. in May 2013 , I had the "gearbox FAULT " appear twice between 2 weeks interval , message would disappear after I shut engine off for 1 minute and started it up again.

this past June, the restrictive performance and check engine light both came on also. I decided to bring it in to dealer again. They said the codes retrieved meant tcm needed to re flashed. The said that last dealer who did this last october did not wait enough so that engine cooled off.

well after putting less than 200 kms on it , I got same codes while backing out this morning.
It is becoming erratating. my car runs very smooth, no harsh shifting , no noises .

strangely but all this happened since I did the J004 recall last August. I also had the sealing sleeve replace last September also.

Can anyone tell me what I should be looking for? any help is welcomed.

 

I flashed my TCM myself, so I really cannot understand what your dealer meant by cooling off the engine.
You're just programming an electronic device..
Afterwards you have to drive that TCM adaptation cycle.

The errors you describe seem to show a TCM that doesn't talk with ECU anymore. You see such messages while flashing the TCM..

There should be some errorcodes to read, that show the cause of the problem.
Maybe your TCM crashes sometimes, so you should check for the correct SW-version and maybe some checksum errors..

 

Sometimes it becomes a matter of cleaning the pins on all the relevant loom connections. In your case the connection into the TCM in the transmission has been disturbed, so maybe a good place to start.

Also have you had a TCM reflash to correct this problem ? Gradual and slight wear in the control valves can cause the problem. The valves aren't worn out, but pressure assumptions are based on new components. The reflash is designed to get the TCM to recognise slight wear in the box.

At least that is what I was told in 2011 and so far no more tranny faults !

 

Thanx Fraser for your input, I see you know your stuff. What they told me was that to perform the J004 recall the car has to be cold.

as for your other stuff concerning error codes, I don't know as I am not the person performing it, but I will mention it to the advisor at jaguar.

 

Sorry, the message below was intended for nebelfuerst.......

Thanx for your input, I see you know your stuff. What they told me was that to perform the J004 recall the car has to be cold.

as for your other stuff concerning error codes, I don't know as I am not the person performing it, but I will mention it to the advisor at jaguar.



__________________

 

Thanx Fraser, for your input, it all seems so logical, but somehow these tech at jaguar seem to think its rocket science. I clearly outline all the actions and symptoms , this way it makes it easier to trouble shoot.

I will call them to make sure what you mentioned was done.

Thanx again!

 

All the above cleaning connectors, pins and communication between the ECU and TCM sounds most logical and are probably the cause.

But just in case you may want to ask your service tech if there are any known side effects of the J004 procedure on the Super V8s. I know there were on the XKRs:
https://www.jaguarforums.com/forum/x...on-j026-74726/ I will continue to look around my technical files and follow up with any pertinent TSBs.

 

J004 procedure makes for some interesting reading... make sure you have a service provider that knows what they are doing as the procedure varies based on your VIN.Recall J004 Revised On-board Diagnostic System Software Revised.pdf

 

Thanx MarcB for your feedback. I just got a call from my dealer this morning, and as the connecter sleeve was replaced recently ( last Sept 2012 ) therefore the TCM in tranny was disturbed. He checked the area around this connecter and saw no oil seepage. But once he removed it he saw oil on the inside of this part. He thinks that when the sleeve was replaced the person did not cleaned the inside pins of this part.

What he did now was clean them and re-install it. he will keep the car and drive it to put at least 250 kms in it. If codes do not appear he will put car back on lift remove the connecter and check if there is oil evident or not. if no oil, well problem is fix and resolved.

If there is oil he thinks its the valve body and that it will cost about $2800,,,yikes!

What do you think ? Has anyone heard of this before?

LF

 

Hello to al my fellow jag lovers,

it has been almost 2 years and 12 ,000 kms since and the good news is that I never had any "Gearbox messages" . Therefore whenever a sleeve is replaced make sure all the connecters are clean and free of any oils.

Enjoy your day and your rides,

Luigi

 

I know this was an update to share that there were no issues after connector cleaning , but I recently had experiences where the "transmission fault" turned out to be caused by two failing coil packs. Apparently they were interfering with the CAN bus. No coil errors reported though.
Weird. Might save someone the cost of a transmission repair.

 

jaguar xj6 tdvi-2.7 diesel-84,000 miles. hi guys ive had the restricted performance problem and its a real bitch when your going uphill! hey louenigma love your wheels man they look like they have been chromed?

 

Hi there,

thanx for your message, sorry I cant help you on your issue, as for my wheels, they were the only option on this model , 19 " custom wheels which was alloy standard.

thanx again,,enjoy ur jag!

 

hey man that's okay bro ive heard it could be just needing re-programed. which doesn't cost all that much. or it could be the turbo if its restricted all the time which mine only happens now and again. or the coil pack might be needing cleaned. thanks man I will