I got my module back from a rebuild, and the error is still there immediately after turning the ignition on. Sometimes the ABS light comes on first, then the ABS/TRAC error message. Both before the car is moving.

Battery is pretty new but haven't done any testing to it.

Android scan tools gives codes P1637

 

I googled P1637 it comes up as possible alternator problem (on a Chevy!) Anywho, try checking battery at idle with volt meter. Somewhere around 14-15 +/- volts should be normal
How old is your battery? Second post suggested getting a new one (great idea)

Another poster has suggested doing a Hard Reset.
https://www.jaguarforums.com/forum/x...ect-faq-74146/

Check ALL ABS connections. I forgot to reconnect one at the back and the light just stays on. Doh!

Check there's enough slack in wires at front wheels at full lock, ie turn steering wheel all the way to left check left front wheel ABS wire to sensor for enough slack. Turn steering wheel all way to right and check right front wheel ABS wire to sensor for enough slack. If you do need more slack, snip off zip ties on control arm, adjust wire and re tie with new zip tie.

Keep us posted, really hope you get this frustrating issue resolved.

 

Ok. went through a few things:

- Battery voltage at idle when the ABS light is on = 14.5V (2 year old battery).
- Connection to ground and battery poles tight.
- Slack on both sides fine.
- ABS reset (neg touched to pos).

No difference. Where are ALL ABS connections BTW?

Another clue, usually the round ABS light goes on first when turning the ignition, then the TRAC error message comes on later.
There is also some slight lurching at times where you put the pedal down and there is no response with the ASC light blinking. Removing the ABS module removes the lurch.

"The P1637 code can be a simple fix--or very complicated. It can be a CAN cable problem to the ECM, an ABS sensor or module problem, a ECM problem, a DSC problem or a TCM problem. A Brake stop switch is another notorious cause of ABS lights. Wiring problems can be cut wires, shortages, polarity problems, connector pins bent/shorted out . . . . "

 

Hi Jagosaurus

Is there any time where the DSC fault does not show up? If so what do you do that makes the fault show up?

ABS light and CEL both light up at start up and then (usually) go out.

ABS sensor connections at each wheel, two under the hood on inner fender (drivers side more easily visible, passenger side is under the air cleaner) and also at the module itself.

 

Sometimes it does not show up at all.

It's always the round ABS light that shows up first, before the TRAC error message.

 

What's happening when light comes on?

 

Does your Android scam tool recognize ABS codes?

 

No, i don't think it does. The error is a drivetrain one. Driving, idling, it can happen any time at random. Could be a lose connector somewhere, could be something more serious..

 

Hi Jag

Might be a good idea to get a scan of ABS codes done to pinpoint the cause rather than stabbing in the dark.

 

Yes, I've inquired with some normal auto shops and they say they can do it, but some say only Jaguar dealers/shops can?

 

So I got codes pulled for $90 with some troubleshooting included.

They said both front left and right wheel speed sensors needed replacing and there was a transmission control unit error.

So just go ahead and replace sensors (about $45 used) and TCU ($45 too used)?

 

As perpetually and consistently troublesome as these wheel speed sensors tend to be, I believe I would go new rather than used. Don't know if they are available on the aftermarket, but it would be worth looking for....

 

A new battery and regural driving.
When I leave the car for more than 2 weeks, big chance that next drive starts with ABS/Trac error. Which goes away after driving 20km and a restart.

 

I know this is an old thread, but this is an ongoing problem for many of us older Jag owners. Fear not. There is a solution if you don't give up:

My ABS module has been saved by Module Repair Pro, Van Nuys, CA. $100 plus shipping both ways, but it was worth it. I don't know exactly what they did, but everything works now. NO MORE IDIOT LIGHTS. No "WRONG PART INSTALLED" messages. No DTCs. I cleared whatever codes might have been there from before, then plugged everything in and powered up. Great! I drove around and put 34-40 miles on straight and very twisty roads at various speeds. Speedo/ODO works again.

 

You should be getting a ABS error that will point to which wheel is giving you trouble. In my case I had to replace the harness on that wheel. The code for me was C1155, pointing to the left front wheel.

 

I know your post was quite awhile ago, but like so many others I am trying to keep my car on the road at great frustration. I had to send my module to the same place you did....for $100 plus shipping both ways. After re-installing it worked great and all my lights disappeared. For a few months, and very little driving. Then, BOOM....all came back. CEL, ABS light, E-brake light, "incorrect part installed" BS.

Simple P1637 general lack of CAN communication between the ABS module and the ECM. OK....deleted the codes, checked all the connections and fluids, etc. All came back....EXCEPT THE TRAC/STABILITY warning. ???? Did also get the P1111 code that indicates a complete scan was done. That one went away. Then P1000 popped up after I did a battery disconnect and hard discharge. That tells me I have UNset all the emissions computers and have to start all over again (about 200 more miles with an outdated license sticker).
So....Gino at Module Repair Pros says I need to send him the ECM. $200 plus shipping both ways. Hmmmmmm... My brother and I opened it up and it is immaculate inside. DENSO Made a really impressive control unit. We couldn't find any visual evidence of any component failure....and there are hundreds of resistors, capacitors, transistors, and ICs. So, I'm not sure what he will "find", but I'd like to look for any alternatives to the solution before I spend another $250+.
The BIG question: Did the module repair permanently fix your ABS and idiot light problem? Did you have any recurrence or have to do any more repairs to that system?

Any help is good help,
Ken K.

 

OOPS! Spoke too soon. I described my new failure and tests on a posting just above. If anyone has more suggestions, I'm listening.

Ken

 

OOPS! Spoke too soon. I described my new failure and tests on a posting just below. I anyone has more suggestions, I'm listening.

Ken