Hi all,
Sorry if this has been covered already I have trailed though pages and pages about this fault with no divinities answer.
Problem: engine fail safe mode, gearbox fault, abs unavailable, track not available, cruise control not available climate control flashes err when ignition turned on. Also Stangley the heated seats won't work when fault is on.

OBD codes read: 1642 1643 1637 1638
When fault is reset car works fine but very quickly returns. I have read some posts about this and only advise seems to be battery low, abs sensors and TPS

Work done so far:
Proved abs wheel sensors all ok.
Checked battery voltage charging and earthing all very good.
Undone cleaned and refitted with contact paste all the earth/ground points on the car.
Work planned:
Remove and clean TPS plug terminals.

My Diagnosis: I think one of the modules on the can network is faulty. Maybe the instrument pack or ecm or climate control.

Questions: is there a better scanner at a jaguar garage that will identify which module on the can network is at fault. That way I can just swap the offending part myself at little cost. Or do you have to guess and try changing all until it is fixed? Has someone on the forum had and cured this problem before.

 

Welcome to the forum Guy, firstly it really helps if you post your car's year (I suspect a 98/99?)
I'd suggest a search of each fault code within the forum and deal with each issue, of course they're probably interlinked but one may fix all.
Also look for the DTC pdf for a list of fault codes within the forum, a member may post it for you, but you'll need your post count up to access the forum files.
Jaguar's software is called IDS for these cars, although autoenginuity has most of it's features - have you a Jag indie around your area?

 

If it is a 98-99, all those codes point to the ECM being faulty, or more likely, a fault in wiring between the ECM and the rest of the network. It seems like it could be a short somewhere. See here for codes http://jagrepair.com/images/AutoRepa...%201997-99.pdf towards the very end. (EDIT: for a 00-03 car, those codes are the same fault)

I would unplug the battery and let the car sit a few minutes, then test the resistance across the two CAN communication wires by unplugging at a module that isn't the ECM or SLCM (I think those are the two at the "ends" of the network, and the ECM is one of the suspect ones). If I remember right, there's a 120 ohm resistor across each end of the wires, so if everything is correct wiring wise the measurement you get should be 60 ohms roughly. If it's much lower you have a short, if it's 120 you have an open at one end, if it's lower then you have a short. You could also check continuity between the ECM can wiring and the wiring elsewhere (I don't know, the TCM maybe, cause it's close?). Wiring diagrams are available on that same site as the OBD codes.

 

Hi sort my car is a 3.2l 2002 xj sport

 

I live very close to two xj xK specialists but don't want to take it there if they can't locate the problem with software. I'm scared they will just tell me to swap this and that without knowing for sure and thus being very expensive. My original question would such places have software/diagnostic computers which could pinpoint the problem or at least point me in the right direction. I don't want to keep trying things spending a lot of time taking things apart possibly disterbing perfectly good circuits plugs and wires I have already wasted a good few hours doing this. I am going to call them in the morning to find out.

 

So the PDF's are different but the answer is still the same.

Electrical diagrams: http://jagrepair.com/images/AutoRepa.../jagxj2002.pdf

Engine OBD codes: http://jagrepair.com/images/AutoRepa..._2001_OBD2.pdf

 

I would suggest reading ALL the modules in the car to see if any have DTCs or lost communication with others.
Could be a faulty CAN bus module or even Selector Lever Illumination module not passing the info through.

The INST PK is the gateway to the networks.

bob

 

So I spoke to the jag garage and he said they had dealt with this before there is no computer which can tell you what the problem is. He said they could faulty find and normally find the problem quickly. So as I have no idea how to fault find on a can network and don't have a tester which can detect pulses. I have booked it in with him to pick up £50 run diagnostic £50 and fault find £40/h so when he finds the fault I will have to buy a new part. I'm looking at about £400 if I'm lucky and they find the fault quickly to fix a car worth £2000. I would scrap it but don't have the time and space to strip it. Oh I went and brought a 2001 xjr with 59000miles last Saturday which already I have had to fix egr valve, buy front disks pads, oil, filters, 2 tyres so my love of jaguars is failing the more I see my money disappearing down the drain

 

Oh and I need to fix headliners on both!

 

Guy, it may be a long shot, but I just got an update from my friend / forum member in the UK last night.
He is working on his 3.2, and part of what he wrote is below (I am sure he don't mind posting this).
You might want to check the inertia / tilt switch before proceeding:

One thing I will mention. To weld under the corner I had to jack up the car quite high so I could get under it. On letting the car back down, I reconnected the batter and switched on. The instrument panel lit up like a Christmas Tree, “Engine Fault”, “Gearbox Fault”, Suspension Failure”, “Part Not Recognised”, Electrical Failure”, “Incompatible Parts Fitted”, “Limp Mode Enabled”. As you can imagine, I nearly died thinking I had burned through some wiring looms!! It turned out to be what I think is a ‘Tilt Sensor’, just behind the accelerator on a RHD car? There was a ‘button’ on the top that I pressed, the Sensor ‘clicked’ and bingo, everything came back to normal, imagine the relief.

 

Guy, do you know if there has been work in the climate control area? After re-reading your issue I once had these systems warnings while I had the dash apart. It turned out to be a screw through a wire from the climate pack, which is on the can network, 2001 car.

A plastic pry tool tool to remove the 'ski slope' and a couple of recessed pozi screws and you can see if moving the climate pack cures it, having a spare on your R can help diagnose.

The XJR is a different and somewhat less troublesome car. This forum and a few tools will save you time and money.
Hope this helps.

 

I think I may have something similar going on with my '99 XJ8. I jacked that puppy WAY up to make changing the front shocks easier, and got all the codes you mentioned and then some. Assuming there is a similar Sensor and Reset on my LHD car, is the sensor behind the accelerator inside the cockpit, or in the engine bay somewhere? Is it possible for you to ask your friend for a photo of the sensor and the reset, as well as more detail on the location? Hoping this is it....and Thanks in advance!

 

On your LHD car, the switch is located on the passenger side foot well, see below link for pictures.

https://www.jaguarforums.com/forum/x...e2/#post591126