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I have an ABS and DSC lights issues and wondered if you could help? XK8 4.2 2003.
I have replaced the front right wheel hub assembly twice.....the original had a mangled bearing...but no ABS or DSC fault. The second turned out to have a noisy bearing too...but when I fitted it...the ABS and DSC lights came on and stayed on.
I decided to buy a reconditioned hub with brand new bearing and just fitted that....but the ABS light and DSC lights came on again...I also bought a brand new ABS speed sensor...but that didn't help.
I noticed the following....when I started the car...the ABS light was on...but no DSC. When I drove back and forth in a straight line...the ABS light went out! Great I thought! BUT...as soon as I went around a bend or reversed around a corner...BOTH lights came on again at the same time.
I suspected that the turning was flexing a possibly damaged ABS cable....so I decided to bare the original cable wires 2cm from the Wheel Sensor plug and tapped in a 2 core wire to that...and fed it through to the connector in the engine compartment...where I connected the other end of the wire directly into that connector,
Same thing happened...Straight line driving...ABS went out...no DSC light. As soon as wheels turned...BOTH light on again!
I have ordered a replacement ABS cable anyway...as I have broken into this one...so will try the new cable when I get it....but is there something I might be missing? I did a hard reset of the system but that didn't help.
Is there anything that would affect the ABS and DSC (other than a dodgy cable) once the steering is turned??
Perhaps the original cable plug is faulty as that still remains...in which case the new cable will sort it? Or am I missing something here?
Any help would be much appreciated as my MOT is well overdue and I can't submit the car for a test as I know it will fail...
Have you checked the replacement reluctor ring to be sure it has the same number of teeth as the other side? I could be wrong, but I believe the sensors are different between the 4.0 and the 4.2, so the rings are likely different, too.
Other than basic sanity check on all 4 wheels, as you already have done some work, the best next step is to take the plunge and get a JLR code reader and get proper diagnostic.
I have Jaguar IDS and here is the associated fault code - C1145.
The ABS Sensor rings have the same number of cogs.
It really seems to point to a fault with the cable..perhaps my "by-pass" cable was unsuccessful? But I can't figure out why the fault only seems to activate when turning the steering...even gently.
This fault code will not clear using IDS...so it appears to be a constant physical issue that causes it.
Have you tried swapping the sensor left to right? What about swapping the harness left to right? Same code? If possible, can you swap the left and right connectors at the ABS module for a quick test?
With IDS, I believe you should be able to chart all 4 wheel speeds, directly over CAN. Check if the right front is just dead, or reading crazy, both when driving straight or in a curve.
From memory, I seem to recall someone had an input circuit problem once on an ABS module, so sensor and harnesses were fine, but the ABS board suffered some damage that prevented wheel speed input. Not sure, though...
In my wife's 2006 XK8, the code C1145 issue turned out to be a faulty wheel speed sensor. A new aftermarket sensor from SNG Barratt resolved the issue....
Swapping both sensor and cable with the other side is the best approach, although he already tried a new sensor. The connector could be at fault. I did report either a C1134 or 1145 a few years ago that was found to be a module fault that could not be repaired.
I think the wiring of the harness may be the same as earlier models, so disconnecting at the module and checking the resistance of the individual circuits while moving the steering wheel may be useful.
I'll await the arrival of the replacement BS Sensor cable and see it that cures the problem. As mentioned, the sensor on the side in question is brand new, but the original sensor had exactly the same problem.
I removed the bypass cable patch that I rigged up...and now both ABS and DSC fault lights are on permanently...suggesting that the cable is at fault...at the plug into the sensor..could simply be a loosened connection within the plug itself?
Will let you know how I get on!
And thank you so much for the replies so far - I love this Forum!
I received the replacement ABS sensor cable today...a used one for £19....and fitted it!
Well....no bloomin change! Still the ABS light on and the DSC Fault showing! To say the least...I was perturbed
So I was about to cannibalise the old cable and build a brand new one using the connectors...when I started to check the Sensor resistance using my multimeter.
Both the old and new sensors had the same reading more or less of 1.7m ohms..so that was fine. However...I checked the reading at the other end of the newly fitted cable..and did the same with the old cable and old sensor (loose, out of the car) and lo and behold I noticed something odd!
The resistance testing only working one way...ie. with the multimeter probes touching positive and negative...showing resistance...but nothing when reversed. Ok...that's as it should be (I think??) but I saw that on my loose cable and sensor the multimeter positive probe went to the red wire (with negative to the white)...BUT...on the newly fitted cable and sensor on the car...it was the OPPOSITE! So the positive probe had to touch the white wire!! Something very strange was going on...as the wires and their plugs orientations were IDENTICAL.
I scratched my head for a while...and then hit upon the idea of REVERSING the cable wires...and Hey Presto! The DSC Fault disappeared...I could suddenly use the DSC Switch, which had been inoperative...AND...after a few yards drive back and forth...the ABS light went out too!!!
Why this reversal had occurred...I have not a Scooby Doo!!! All I know is that it has worked
HOWEVER......This is a Jaguar after all....and when it gives with one hand...it takes away with the other! Just as the ABS light went out...the Engine Management light came on!!! Bummer!!!
After running IDS SSD on it...it turns out to be a Lambda sensor - code P1646 Bank 1....so at least totally unrelated to the ABS/DSC issue...phew!
Lambda sensor now replaced with a brand new Denso DOX 0430 unit from Eurocarparts at £85 and after fitting and clearing fault code...all warning lights disappeared...so thankfully back to normal
ABS Light comes on right away on start up. The battery is good and fully charged. I’m assuming that if the light comes on in this fashion it could only be the welds in the abs module need to be done. The module doesn’t read sensors till you start rolling. The car is on jack stands because I’m doing a complete recon on this poor 1 owner Abused 2000 XKR.(exhaust manifold, tube up, brake jobs, oil leaks, trans leaks, etc.) How common is this problem?
ABS Light comes on right away on start up. The battery is good and fully charged. I’m assuming that if the light comes on in this fashion it could only be the welds in the abs module need to be done. The module doesn’t read sensors till you start rolling. The car is on jack stands because I’m doing a complete recon on this poor 1 owner Abused 2000 XKR.(exhaust manifold, tube up, brake jobs, oil leaks, trans leaks, etc.) How common is this problem?
From what I have read....it is quite common. And you are right...my ABS light stayed on until I drove the car back and forth for a short distance (only 30/40 yards or so) when it went out. So you must do this to see it the light goes out first before getting involved with other stuff.
If you have a multimeter....then check the resistance of the sensor....but ALSO of the wire attached to the sensor as this will help to tell you whether the wire is at fault. Easy to undo the connector just on the inside of the wheel arch inside the engine bay. On my RHD...the RH sensor connection is clearly visible with a red/white wire coming from the sensor...on the left side...is is a little hidden and slightly fiddly to get to...but not that bad. Compare reading from each front wheel so as to help you narrow the problem down.
I have read about the solder joints withing the ABS module...but that is one of the last resort things to do as I see it involves a lot of fiddly work. My RH sensor wire was indeed faulty as it sent the multimeter crazy...whereas with the replacement wire...it settled quickly. As to finding that the polarity had flipped...well I don't know what happened there...except that I first replaced the original wheel AND sensor from an older model and that's when the faults lights first came on. I quickly fitted the original sensor..which has a different design shape...but it didn't help. I suspect that the sensor from the older model sent something astray and this was only rectified by flipping the wires to the sensor...now all works as it should and using Jaguar IDS the fault has cleared too.
Oh....I got my replacement (used) wheel sensor cable from Auto Reserve Jaguar in Ilkeston, Derbyshire..via their eBay site (just under £19 including delivery!). Although they have a great website too at https://www.autoreservejaguar.com. I visited them in May and they are great to deal with and have extensive stocks. Highly Recommended! And they deliver worldwide too!
ABS and DSC Lights on
