Hi everyone! Please help! I have a Jaguar XKR 2002 4.0 with supercharger, and the story goes like this:
Took the Jag to a shop about 2 months ago, where they did a little paint work and had to remove a front seat. After they have done that
all ok, seat in place, but car goes into some kind of limp mode, power loss, drives in one gear, ABS warning lights come on and so on. Nobody knows what the problem is,
I have checked the wire connections to the seat, everything looks fine. As far as i'm concerned, they didn't untach anything else in the shop. Ok, so the problem continues, I had the car to 2 other shops,
we checked the ABS sensors with a multimiter, they show the same resistance. Also at 2 shops they said the ABS control units are fine (how did they know that, no clue). So dropped off the battery, car sat for a while
next morning reattached, everything works, no power loss or ABS warning lights, drove for about 60 kilometeres, went for the MOT, got it, stalled the car, started, and the warning lights are back, ABS, and car drives in some limp mode or restricted performance mode (1st gear only)

the programm with which I checked for possible faults reads trouble codes: P1794, P1720, P1632 in the Transmission control module section.
C1095, B1676, U2012, U2500 in the ABS section. Also reads that CAN signal from front right and left wheels from ABS is implausible. Same goes for the pedal position, engine speed and engine torque CAN signal output by ABS on the CAN communications bus.

So my questions would be:

1) Where could be the fault?
2) Is it the ABS sensors or controller?
3) Is an ABS module with numbers LNF2210AB or LNF2210AC compatible on my Jag, cause mine has the number LNF 2210 AD? That letter D could mean it may not work?
4) Is the fault somwhere in the wiring harness or connections?

Thank you very much in advance!

 

With that many different faults I would first be looking at the battery. Fully charge it once more overnight and see if it happens again. Also check the age of the battery.
Maybe time for a new one.

 

<p>+1 on battery recommendation - these cars tend to be a little testy when battery voltage is low. &nbsp;If the battery is between 3 and 5 years old - highly recommend just replacing it.</p><p>As this is your fist post, please take a moment to stop by the new member section and post an intro. &nbsp;In return, you will receive a warm welcome and some useful tips for navigating the forum.</p><p>New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum</p>

 

I've heard of this before - it's the J Gate conns. Everything goes through there and if it loses connection all sorts of faults are thrown up. They must have upset it when removing the seat.

 

Yes +1 on the battery.

 

Or the battery is flat!

 

Actually, while it was in the body shop I assume it stayed put and wasn't run. Look closely at the ignition switch - can you see down into the barrel? If you can it means the little shutter (that closes when you remove the key and puts the car's electrics in sleep mode) is stuck. Then the battery goes to a low voltage in approx 36 hours. WD40 (Duck Oil) on the key and a few insertions should fix it.

 

Thanks guys! Will try to check those out!

 

Many shops leave doors open / radio on / etc and the battery ends rather low. Hope it's as simple as that.

 

The low battery is a good place to start but I have had the same situation as yours.
On a 1000 mile round trip after 500 miles a rear hub got hot and became loose. I replaced the hub from a local breakers yard that had a 2003 XJ8 Cost $15. The wheel speed sensor was melted but the XJ8 had already been stripped of them.Drove home with the ABS, Traction control,ASC not available and no cruise control. near the end of the trip the car went into limp home mode. One gear only an a whole slew of faults. Replaced the speed sensor the next day(again from a 2003 XJ8 in the local breakers, cost $9.95.) and all the faults cleared. Car back to normal. I hope you can glean from this some insight to the problem.

 

Hello, still having the ABS limp mode problems, battery didnt help. One electrician said it's the ABS module, and i have an opportunity to get a new cheap ABS module which might help, but it has the letters AC in the end of the code, also can get on ebay the one with the AB. Mine is Is an LNF 2210 AD. Are they compatible?
Thanks!

 

Hi everyone again! Got the problem fixed at last. Checked all the abs sensor cables, sensors, everything was fine. Checked almos everything i could. Then started going through the electrical wiring diagram, and found that the yellow CAN signal wire loses continuity between the abs plug and the transmission control module (if im not mistaken, its in right of engine bay closer to the windshield under the black cover). Looking through the diagram, found there is a speed control unit of some sort right at the radiator, and guess what. The had been in some crash before at the previous owner and due to that, the connector was broken so he just stuck every pin by its own into that speed control unit, and the connection went bad. Whew fixed that, now ok! Hope this helps someone, although it's an uncommon fault i guess. Used electrical wiring diagrams from this russian site:

http://portal-diagnostov.ru/index.ph...998-jaguar-xk8

 

Glad to hear you have it sorted and thanks for the update.