Welcome -

Yep, sounds very much like pump solder points need a resolder. Dive in, it's a common problem - the intermittent to solid light/warning is a dead giveaway.

Go slow and steady when opening it up.

 

Physically is the ABS module box located under the hood?

Thanks!

 

http://jagrepair.com/images/AutoRepa...heet%20XK8.pdf
Here is a pdf from the XK8 forum. Same ABS module. The resistance values do not seem to be the 1.0- 1.2K that everyone seems to find, don't worry about that.
RJ_____________
97XK8 85K mi

 

The ABS module is front left corner of engine compartment.
RJ

 

Left corner with me facing the engine compartment from Winshield view?

 

In the US, in front of the driver, at the corner of the car, almost up to the radiator, off to the side.

 

Since it is damp again, my XJ8 will once again be having this problem. In terms of the wiring, is each circuit from the control module to the wheel sensor continuous, or are there intermediate connectors? I'm wondering how many possible points of poor connectivity or corrosion there are. And if there are intermediate connectors, where would they be?

 

Hi Boomer
Note: I updated the PDF file was listed below and included it in post #31. I also updated the 2 JPEG files that are in this thread.

Looks like 1 connector between ABS Module and each ABS Wheel Speed Sensor.







Jim Lombardi

 

I did this job last week. I would bet it is a bad solder connection. My mechanic said he thought it might be the abs module and $1600 should fix it. I don't like throwing money at guesses. I followed the instructions posted here and in an hour and a half I was done. This includes searching for tools to fit in the tight space and waiting for the epoxy and silicone to set. The brake lines bend easily out of the way. Instead of cutting the whole lid off the module it might be easier to just cut open the corner of the box that the wires go into. The soldering is the fastest and easiest part of the job. Don't worry it's easy.

 

In the Wiring Guide info reproduced above by Jim Lombardi, the connectors LF1 and LF2 are described as being "below chassis rail" on the right and left sides. Does anyone know where this is more explicitly? Get at them from above or below the car? In plain sight or hidden? Near any obvious landmarks? To use language from my math and logic classes long ago, JTIS information is often "necessary but not sufficient."

 

Hi Boomer
See if you can find the connector between the ABS module and the ABS Wheel Speed Sensor by following the 2-wire harness attached to the ABS wheel speed sensor back towards where it splits off from the Front Axle Harness. Maybe the connector is where it comes off the Front Axle Harness.

Here are 2 more Wiring Diagrams - Front Harnesses and Rear Harnesses:



I also updated the ABS Wiring Diagrams PDF file to include these 2 new diagrams and added notes to the others related diagrams about them:

2001 XJ ABS wiring diagrams R1.PDF

Jim Lombardi

 

Boomer, those connectors are easily found. Start at the connector to a front wheel speed sensor, that's one end of the link harness. Follow the harness up and across the upper "A" arm, there is a loop where it meets the body. About 4 inches ahead of that loop is the connector you are looking for, clipped to the underside of the body tube. [LF1 or LF2]
That 2 foot long harness is a weak link, good for lots of intermittent ABS faults.

Good luck!

 

xjrguy -
Is the typical failure mode connector corrosion or wire breakage? Should I consider buying these harnesses as a preventative measure? (assuming they are still available....)

 

So where exactly is this connector hidden and how does one access it??
When you say 4 inches ahead, do you mean 4" toward the abs module and hidden from view? if so, how do you access it?

Are you suggesting these simply be replaced??

 

Maybe this will help! See attached.

Cheers,

 

Perfect, Thank you

 

Hi Boomer & WaterDragon
Looks like the ABS Wheel Speed Wire Harness is still available

Part# LNF3410AA is for each side in the front wheel location of car
Jaguar dealership list $113 discounted $91.25 shipping $14.95
Aftermarket W0133-1904794 the autoparts parts shop.com $98.60 and
auto parts network.com $100.85 free shipping

Used ones are also available on Ebay

Here is a JPEG of the front wheel one:



Part# LNF3425AB is for the rear wheel location
Jaguar dealership list $85 discounted $69.30 Shipping $14.95

JPEG of the rear wheel one:




The ABS Wheel Speed Sensor is part# LJA2226AA (same part number for both front & rear wheels)
Jaguar dealership list $268 discounted $218 Shipping $27.77
SNG Barratt USA website $194.25 Shipping $12.00

Jim Lombardi

 

Okay, I can NOT explain this one away..

I did the sensor resistance check at the wheels and at the connector level, all was within specs. I cleaned the sensors but still randomly the ABS/ASC light would come on. Mostly after the next startup after the first morning start. It's been becoming more frequent over the last few months.

Ironical at the same time I was starting to get "low coolant" lights for the first time since I've had the car. I have smelled coolant for some time but could never really pinpoint exactly where until I read a very informative thread hear about the reservoir. I was thinking the leak was coming from the sensor when a member point out it can't be because it's a probe that just inserts up into the reservoir and snaps into place- no seal. The reservoir level sensor in inside and appears t under with a magnetic ring that the probe senses coolant levels.

Anyway, I changed the reservoir out, which came with a new sensor, and Veloa! I have not had a ABS/ASC light since!

Can't explain it, don't see anything in the ABS harness plug that would lend it self to a common link but I no longer see an ABS/ASC light pop on upon the second startup. Over the last few months it would come on almost after every second start up within a few minutes of driving.

Don't make any sense I know but I waited a week to post this to be sure.

Thought I'd post all thinking maybe someone else can explain the ghost in the machine.
..

 

Hi !
At time of your original warning light issues did the car go into the "restricted Mode" as my 2000 XJ does along the warning lghts as well.

 

Hi
Here is ABS Control Module Pin Out Information JPEG:
https://www.dropbox.com/s/t4cb9acu20...nformation.jpg

Click on image after the dropbox webpage appears to get a better view of images.

Jim Lombardi