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        General >> Problems >> Abs light 
        
(Message started by: a900one on Aug 31^st, 2019, 7:08pm)

Title: Abs light
Post by a900one on Aug 31^st, 2019, 7:08pm

The abs light comes on at app 15 mph + the traction ligh,. It seems to pass the startup test. I have checked the back sensors and they look ok, I have cleaned them as a bit of rust was on them, they have the same resistance as well. I have also checked the tyre pressures, and they are right. My Foxwell scanner wont read the codes, so I am working in the dark on this. I have not checked the fronts yet. Its a 1998 cosworth.

Cheers Gerald.

Title: Re: Abs light
Post by brds on Aug 31^st, 2019, 9:41pm

You're probably correct that it is a brake sensor failing the rolling test. To save you time on the analysis, Forscan with a laptop or tablet or phone and an ELM 327 will give you the codes. It also has a comprehensive test of the ABS.
Bob

Title: Re: Abs light
Post by Torbayboy on Sep 1^st, 2019, 7:56am

Hi Gerald, had this on our late 2.3 estate, (the rolling test is at 15 mph as you mention)it had been stood for 6+ months and on regular use the car has settled and cured itself, only ever happens occasionally.

Is your abs still working with the lights on? and is the car in reguular use?

One final things are all the tyres same size and at same p s i as there is a 2% tolerance on the traction control and that will light it all up, had a mix in mine when I changed to black rims, put all the tyres back to same size--problem solved.

HTH Roy :) :)

Title: Re: Abs light
Post by a900one on Sep 3^rd, 2019, 5:55pm

Hi Roy
The car is used every week at some point so was not that. I may have sorted it, I started to check the front sensors and I could not get the plug to go back in the socket, now the light wont go off. I had to go to the scrape yard to see if I could find a socket and found transits use the same for the ABS. I have now fitted it and the light has gone off, may have been the problem all along, so happy days.
Gerald

Title: Re: Abs light
Post by a900one on Sep 5^th, 2019, 5:39pm

Its back on again and a scan by a mate has hi-lighted a pump fault and o/s front sensor fault. If the pump was faulty that would keep the light on on starting ?, or am I wrong with that. As the sensors wont come out without destroying them and they checkout ok I am not sure what to do. Is it possible to clean the ring and sensor by removing the cap over the wheel bearing nut ???.

Title: Re: Abs light
Post by Tompion on Sep 5^th, 2019, 8:26pm

If the code was C1095 Hydraulic Pump Motor Circuit Failure it is probably faulty solder joints in the controller.

The sensor code could be old if it was faulty before you changed the plug - did your mate try and clear the codes?

You can clean the sensor ring by removing the cap.

With ABS you can tie yourself in knots with when the light comes on cleaning sensors etc the only real way is to use a code reader, it's well worth buying a cheap ELM 327 as mentioned by brds either USB or Bluetooth - assuming you have something to link it to.

Title: Re: Abs light
Post by brds on Sep 6^th, 2019, 10:11am

As I mentioned above, Forscan has a separate stand-alone test for the ABS which includes running the pump for a second - you can hear it run if all OK. If you get the C1095 code there will be plenty of advice here as to how to best fix that.
Forscan also has a nifty stand-alone test for the fans which is handy as otherwise the high speed hardly ever gets to run.
Bob

Title: Re: Abs light
Post by a900one on Sep 6^th, 2019, 10:40am

I think it is a fault with the controller after reading about it in the fault finding section, and is most likely to be the solder joints. The information he got on his scanner was the part that was faulty eg pump motor failure, o/s front abs sensor wireing fault, I did not see a code number, it was done in a hurry as he was short of time. He also did not clear any codes. I will get Forscan as I need to be able to read codes etc. I checked out the post in How to do things on the controller repair and the pictures have gone, can they be put back. Has anyone got a spare I could buy Mk20 with traction control.

Title: Re: Abs light
Post by brds on Sep 6^th, 2019, 1:22pm

You can easily check for the ABS pump problem with a multimeter. Unplug the pump from the controller and measure its resistance. It should be 2.5ohms. If that is OK, measure each of the 2 output pins of the controller to earth. The L/H pin of the controller (looking from the wing) should be 183K ohms and the R/H pin should be Earth. If either is open-circuit, you have cracked solder joints on the circuit board inside - a common problem.
You can then either change the complete ABS unit or take it out and try and mend it - possible (there's advice how to do it on the forum) but an awful lot of very messy work to disconnect/reconnect all the pipes, take the controller apart, put everything back and bleed the whole system.
I once did all this and messed up the thread on a connector so had to buy a replacement, only to find that the replacement had the same problem. So, do not buy a replacement without checking it first!
At that point I decided I had nothing to loose by just warming up the O/C pins with a clean soldering iron for 1 minute to cause the solder joint inside to re-make. You just have to be careful not to apply too much sideways pressure or you will disturb the pin alignment as the plastic around it softens.
This may seem extreme but having seen inside the controller on the old unit I knew it was fairly safe.
Reconnected and tested with Forscan – pump ran for a second and test was all OK. (Had an initial minor problem with R/H earth connector slipping up inside its housing and not making contact so beware of that).
Then road tested - All OK.
I suggest anybody with a C1095 does the simple 10 minute resistance checks above and if the pins look O/C, try warming them up as I did. You have nothing to loose at that point and could save an awful lot of time, work, grief and money.
Bob

Title: Re: Abs light
Post by a900one on Sep 6^th, 2019, 5:26pm

Thanks Bob for the information, I checked the controller and got the values you put. I had another go at reading the codes with my Foxwell meter, and after entering the vin number, it will read the car and run the pump,so the controller is ok. I also found my multimeter leads had a fault,so will need to check values again with new leads.

Title: Re: Abs light
Post by brds on Sep 6^th, 2019, 6:03pm

Very good news indeed! Just be wary for a C1095 coming back as you may have only temporarily moved a loose pin connection in the circuit board - this fault can be problematic as it does tend to come & go.
If you think you have a wheel sensor problem, they should measure 1100 ohms.
If you spin the wheel you should get a small ac voltage. When I last checked mine the fronts were both 0.4V ac for half-a-spin. The exact value depends on how fast you spin them. You can get technical with a scope looking for a wave-shape but a meter reading should be good enough.
Bob

Title: Re: Abs light
Post by Tompion on Sep 7^th, 2019, 1:23am

Codes will remain after a fault is rectified they will eventually clear after a certain number of cycles. The only way to be certain what's active is to clear them & see what comes back.

I assume it's a MK1V (not MK20).

I wouldn't heat the pins but that's up to you.

People say you can get the controller off without disconnecting the pipes - not had to remove that version of controller myself so not tried it.

Sent you a PM.

Title: Re: Abs light
Post by Simmo on Sep 7^th, 2019, 8:45am

Tompion, Sir. You have a PM and email. ;D

Title: Re: Abs light
Post by Tompion on Sep 7^th, 2019, 11:07am

Thanks Mike - I think ;D

The how to do things pictures about code C1095 have now been updated.

Title: Re: Abs light
Post by Pegasus on Sep 13^th, 2019, 1:50pm

I get this sometimes - always in summer (hot/dry) when I've pulled away over something dodgy like gravel. Usually disappears after a few runs and always after rain. ???

Thankfully the MOT is in November.

Title: Re: Abs light
Post by PJDavis on Sep 13^th, 2019, 5:42pm

The model of Jaguar I have (X300 and X330) have the same controllers as the Scorpio except they have Jaguar scrolled on them. Unfortunately the controller is mounted in such a way that one must remove it completely which upsets the braking system. I've done it twice now, once with each car, I had one controller repaired by (you-know-who) many moons ago, and repaired one myself just following the instructions on here. The controller can be tested by just plugging it into the system and lying it to one side. I was only able to do this because of help from the usual people on here.
Peter

Title: Re: Abs light
Post by a900one on Sep 13^th, 2019, 6:00pm

Yesterday I went 30 miles with the light on and on the way back it was off. The sensor tests ok and puts out a voltage when you turn the road wheel, and the controller pins are ok. As the light goes off when the ignition is turn on it will pass mot as it is, due next month. Peter, do you think the jag unit will fit the scorp.
Gerald.

Title: Re: Abs light
Post by PJDavis on Sep 18^th, 2019, 5:42pm

The electrical part of the unit from early Jaguar X300, and X330, both 3.2 and 4 litre is a straight swap. The pump is slightly different. However, there is no advantage to be had on cost.

Title: Re: Abs light
Post by a900one on Oct 25^th, 2019, 9:59pm

The problem seems to have been the o/s front sensor, now changed, as the light now has stayed off for a few trips.
It passed the mot with no problems, as now no road test so it would not come on, who remembers when they put a brake test meter on the floor and took the car for a road test.

Title: Re: Abs light
Post by Torbayboy on Oct 26^th, 2019, 8:43am

I remember when the local Ford garage proved to me the handbrake wasn't working on one side in the MOT by driving it at speed in their car park and looking for the skd marks on the floor (and drivers seat-it was a small car park ;)) & in a 1500 Anglia (with NO seat belts and No screen washers), even the heater was an option at that time!

No more Anglias now all botched-like mine was, need a comfy hotel room to drive around in!
Roy

Title: Re: Abs light
Post by Simmo on Oct 26^th, 2019, 8:44am

Showing our age ! Tapley meter (https://www.ebay.co.uk/i/173876215503) ;D

Title: Re: Abs light
Post by QuentinG on Oct 26^th, 2019, 3:01pm

Encouraging ending, I checked and adjusted the tyre pressures on mine (all were down to different extents) and so far the lights have not come back on.

Title: Re: Abs light
Post by a900one on Dec 4^th, 2019, 3:41pm

Dam thing is still coming on, stays off to start with and after a short stop it sometimes comes on. Its still when you get to 15mph so it passes the main test and fails the sensor test. New battery just fitted, but still the same, could it be the plug to the pump, had top hose blow some time ago, water everywhere.

Title: Re: Abs light
Post by PJDavis on Dec 4^th, 2019, 5:24pm

You need to get it coded, see if't 1095, I suspect it is.

Title: Re: Abs light
Post by a900one on Dec 6^th, 2019, 9:36am

Hi Peter
I have got that code and 1145 but I have changed the sensor and checked the wiring, had to replace a plug socket, and all worked ok for several trips. I can scan the car now with my foxwell scanner but it wont clear the codes. Also when I do the scan it runs the pump, so I know thats working, and the abs works when the lights off. The battery has just died, over night :o, so I think I will let it settle down for a few trips. I have looked at the big plug and wound it in and out on the bolt to make sure it has good contact
Gerald.

Title: Re: Abs light
Post by Torbayboy on Dec 6^th, 2019, 12:14pm

"Battery died overnight"

Bought some batteriews (? show off?) recently from ebay trader Tayna batterires, found exide for a cossie for £60 delivered, all fine.
Perchance the battery is on its way out and is influencing the car generally.
Jes tryin to help

Title: Re: Abs light
Post by a900one on Dec 6^th, 2019, 4:32pm

Hi Roy
I have used them, batterys for my scooter, and they seem good. To get a battery near the 75 amp hour and 680cca I went to Euro parts, £75, for a varta. I was thinking it may of upset the car so I will see how it goes, went for a 15 mile trip yesterday, all ok
Gerald.

Title: Re: Abs light
Post by a900one on Aug 6^th, 2020, 2:42pm

Well after putting it off, I soldered the pins to the feed wire for the abs pump on a spare unit. I then changed the unit without removing the pump, a lot less trouble than having to bleed it all, a bit tight though. It has not been on for a while now so I think it has worked. 8)

Title: Re: Abs light
Post by PJDavis on Sep 8^th, 2020, 4:37pm

The single person to thank for the ability to do the soldering job is.......Tompion. Hoorah!