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Apologies, I thought there used to be a FreeScan thread but I cant find it.... probably just missed it!


I am getting an ABS light coming on on my car (GT3), can Freescan diagnose what the problem, ie. Wheel sensor etc, which wheel?

 

Any issues with driving the car with the light on other than the fact that ABS wouldn’t be working ... I assume I would just have normal breaking?

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Freescan does not read codes from the braking system but Espritmon can for pre '98 cars, ie with the Delco system. So if you have the later 98 onwards interior you need to find someone with a Tech 1 scanner and the abs module

Edited by internets

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Ok... sounds good i have a 97 GT3 with the old interior... never used Espritmon though so i will have to read up on that.... same cable as FreeScan??

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:thumbup:

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My lotus dealer hooked up the tech scanner to identify which sensor was faulty on mine a few years back. Took 5 mins in the car park. They should do it for free, especially if you are going to buy the part from them. I managed to swap it myself and I am no spanner monkey

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They never do though. Most main dealers will charge a 3 figure sum for a diagnostic (in truth, when a tech scanner costs over £1000 I'm not that surprised though!).

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But Espritmon can tell you which sensor is down right??

 

Whats the situation with driving the car as is.... just a loss of ABS function or something more serious?

 

Oh, and by the way... are we talking about a Lotus part here (97 GT3) or is it from another car?

Edited by GordonMasson

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Espritmon will identify the faulty circuit, but it could be the wiring instead of the sensor.  Driving this ABS system with a fault doesn't compromise braking effort, only ABS.



I've tried to source ABS sensors generically, no luck so far!

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The GT3 from VIN 2200, plus 2192, got the Kelsey Hayes EBS 430 system which Espritmon will not communicate with.

 

If you are running the Delco Moraine system then be aware that the workshop manual states

Prolonged vehicle operation with a flashing ABS tell tale may further damage the ABS system and may cause complete ABS system failure

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Aaaagh! Got meself mixed up here.  Which ABS system is on the car?

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So just to recap for Gordon's sake ;)

 

Gordon has a '97 GT3 with Delco braking system which WILL work with Espritmon AND the ALDL lead as used with Freescan, but according to Sailorbob best not run it too long with the ABS tell tail flashing otherwise could cause further damage.

 

I believe Sparky brought an ABS sensor from SJ's and I am fairly sure they are the same between the Delco (pre '98) and Kelsey Hayes (post '98) system

Edited by internets

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Duh.  Yeah, running that system faulty does affect braking, to my knowledge.  I've bought several sensors from SJ and PNM.  I've tried to pattern them a number of times, but no cigar.

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Thanks guys. Abs light doesn't flash it just remains on??? What does that mean?

Will try to hook up espritmon tomorrow.

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Don't crash with the ABS light on, your insurers will take a very dim view of that!

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Is this likely to be a relay or fuse or the like??

There doesnt seem to be a lot in the manual that i have come accross so far other than if the light is on constant it means that the ABS has been disabled but i read elsewhere that you could disable it by removing a fuse??

I did get this fault once before and then it cleared its self so i am wondering if its a fuse or relay thats got dirty contacts?

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I think it tends to be the wheel sensor, there has been quite a few people post on here with ABS light on, often intermittent. A new sensor fixed my problem.

 

 

some old threads about the abs lights (not all are 100% relevant due to model variance)

 

http://www.thelotusforums.com/forums/topic/36355-abs-light-on-until-have-covered-several-miles/?hl=%2Babs+%2Bwarning+%2Blight#entry320098

 

http://www.thelotusforums.com/forums/topic/25998-brake-warning-light-on-dash-comes-on/?hl=%2Babs+%2Bwarning+%2Blight

 

http://www.thelotusforums.com/forums/topic/28058-abs-fault-finding-pressure-switch/?hl=%2Babs+%2Bwarning+%2Blight#entry316176

 

http://www.thelotusforums.com/forums/topic/24362-abs-not-functioning/?hl=%2Babs+%2Bwarning+%2Blight

 

http://www.thelotusforums.com/forums/topic/21086-abs/?hl=%2Babs+%2Bwarning+%2Blight#entry211333

 

Your own thread on ABS from 2008 lol

 

http://www.thelotusforums.com/forums/topic/17813-anti-lock-warning-lamp-on/?hl=%2Babs+%2Bwarning+%2Blight

 

http://www.thelotusforums.com/forums/topic/13674-abs-pressure-switch-thanks-bibs/?hl=%2Babs+%2Bwarning+%2Blight#entry142125

 

http://www.thelotusforums.com/forums/topic/10234-abs-woes/?hl=%2Babs+%2Bwarning+%2Blight

 

http://www.thelotusforums.com/forums/topic/9631-kelsey-hayes-430-abs-unit/?hl=%2Babs+%2Bwarning+%2Blight#entry98860

 

http://www.thelotusforums.com/forums/topic/9495-abs-brakes-on-1998-gt3/?hl=%2Babs+%2Bwarning+%2Blight

 

http://www.thelotusforums.com/forums/topic/7231-abs-warning-light-easy-fix/?hl=%2Babs+%2Bwarning+%2Blight

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Hi,

My ABS light is on ( not flashing ) It comes on soon after starting the car & stays on.

Brakes seem to be working but the pump will run now after every second push of the pedal.

Would this suggest the dreaded switch &/or accumulator ?

I'm going to have a go with Esprimon again ( couldn't get it working previously ) but have a couple a questions for the brake experts among you.

1) To remove the accumulator is it just a case of pumping the pedal 40 or so times with the ignition off ?

2) what do I need to do to remove the switch so I can try cleaning it, will I need to drain some brake fluid out ?

Many thanks, Phil.

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Ok, quick update.

I've been reading through other threads & decided to check brake lights, guess what ? not working !

So I've had a quick look at switch & sprayed it with WD40 & got them working. Been out for quick run & no ABS light :D

Can someone please confirm how often pump should run though, at the moment it's every 2nd press of pedal, I'm sure it used to only run every 3rd or 4th press ?

Brakes seem fine, in fact they feel better than I remember ( don't really use her much in Winter )

Thanks again, Phil.

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Hi Derek,

 

I thought every other time was too much, would this suggest the switch or accumulator or maybe both ? & any pointers to removing these i.e. draining brake fluid & reducing system pressure ?

 

Many thanks, Phil.

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Mine was about every other brake pedal press ever since I bought the car and ran like that for three years. I recently changed all the brake lines (except for the front flexible lines and front caliper final connection rigid lines) and then the pump ran every other brake pedal press. I changed the accumulator and it's now up to typically every four presses.

 

You have to depressurise the accumulator before removing the switch or accumulator. No need to drain the brake fluid as you only get a few drops of fluid loss. The entire system must be bled when you refit the accumulator according to the manual (not sure why you need to do the fronts as, in theory, the circuits are separate). The manual says you do not necessarily need to bleed the system if you are quick enough when changing the switch (probably because there is air where the switch sits slightly higher than the high pressure outlet pipe with no way of bleeding it out).

Edited by sailorbob

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Hi Derek,

 

Many thanks for your help ( again )

Very much appreciated. I think I'll order an accumulator anyway & swap this & clean the switch while I'm on.

I'll let you know how this goes.

 

Phil.

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Removing the accumulator first makes access to the switch much easier. Get a new O ring for the switch too in case the old one is damaged.

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