delux
Part of things
There's treasure everywhere!
Posts: 530
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Mar 10, 2018 10:43:46 GMT
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Hi, I’ve recently got a mk3 GTi 8v from a friend. It runs perfectly. It’s an R reg and from the vin I can see it was made in South Africa (U) - don’t know if that makes any difference. It’s just failed MOT as the ABS light wasn’t coming on at ignition, neither was airbag. I found the plug disconnected. How it got thru mot the last few years before I don’t know... Anyway I’ve reconnected the plug behind panel on dash and airbag light works correctly but ABS light stays on. I’ve pulled the fuse box out and compared it to the fusebox diagrams - mine doesn’t have the top most two rows of relays! The ABS fuses are fine but I can’t find relays 15 & 16 for the ABS. I’ve looked in the engine bay and only found a 20amp fuse near the battery & abs pump. Cant see an ABS Ecu either. I also tried two different OBD fault code readers and both fail to connect to ECU... Anyone know what’s going on with this car so I can try sort the ABS? Thanks,  |
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Mar 10, 2018 11:32:48 GMT
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Do like I did on a Corrado - remove the lot! No ABS- no fail . Parts are increasingly hard to get for those old systems
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delux
Part of things
There's treasure everywhere!
Posts: 530
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Mar 10, 2018 14:30:40 GMT
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Is that allowed now days? I thought removing ‘safety equipment’ was a no no.
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bstardchild
Club Retro Rides Member
Posts: 14,886
Club RR Member Number: 71
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Mar 10, 2018 15:24:12 GMT
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Does the ABS still work or not?
I'd be bridging the ABS light to the Airbag or Oil light - anything that follows the same routine comes on with ignition and goes out after start.
I appreciate that doesn't solve the problem but it does get you rolling with an MOT
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Mar 10, 2018 15:40:40 GMT
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Is that allowed now days? I thought removing ‘safety equipment’ was a no no. Optional extra on all MK3 Golfs, didn’t become standard fit until the MK4 in September ‘97. Most MK3 didn’t have it. MK1 Focus didn’t have it as standard fit. |
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bstardchild
Club Retro Rides Member
Posts: 14,886
Club RR Member Number: 71
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Mar 10, 2018 15:42:03 GMT
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Is that allowed now days? I thought removing ‘safety equipment’ was a no no. MOT Rules Say When testing vehicles that have ABS fitted the road wheels should not be allowed to rotate clear of the standing surface with the ignition on as this can cause the ABS system to indicate a fault which may require specialist equipment to rectify. If an ABS or ESC system has been intentionally rendered inoperative, the whole system must be removed. However, this does not apply to sensor rings or other ABS components which are an integral part of another component e.g. brake disc or drive shaft. I removed all the ABS from my Monza but left the sensor rings |
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Mar 10, 2018 15:43:09 GMT
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Oh and I’ve figured out why your OBD readers won’t work. This uses OBD1 protocol. You’ll need something different. I think you can make a cheap LED flashing unit that flashes the fault codes for you
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bstardchild
Club Retro Rides Member
Posts: 14,886
Club RR Member Number: 71
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Mar 10, 2018 15:43:12 GMT
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Is that allowed now days? I thought removing ‘safety equipment’ was a no no. Optional extra on all MK3 Golfs, didn’t become standard fit until the MK4 in September ‘97. Most MK3 didn’t have it. MK1 Focus didn’t have it as standard fit. Ahh can we check if this Golf actually has it first?? |
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Mar 10, 2018 15:45:58 GMT
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Has it had a clock change at all?
I had an Audi coupe and had a similar issue.
The Audi had the abs relay under the rear bench, maybe worth a look? In the end my relay was dead but it was easy to test once I found it.
Appreciate it was Audi but I’d imagine the technology was the same on this era of vag.
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Last Edit: Mar 10, 2018 15:47:09 GMT by PistolPete
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Mar 10, 2018 19:05:36 GMT
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Optional extra on all MK3 Golfs, didn’t become standard fit until the MK4 in September ‘97. Most MK3 didn’t have it. MK1 Focus didn’t have it as standard fit. Ahh can we check if this Golf actually has it first?? Good call. Will be in the PR codes. The ABS light on these is a separate part of trim to the clocks and plenty of 1.4s had a blank there instead  |
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delux
Part of things
There's treasure everywhere!
Posts: 530
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Mar 10, 2018 21:48:49 GMT
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Yeah this car has ABS fitted, there’s no white sticker in the boot so no option codes, don’t know if it was standard on the GTi but I’m guessing so - which according to my emergency braking on the wet road outside my house - is not operating. Rear wheels lock & skid. So if I do jumper the wires to pass mot or buy a non-abs trim panel cover I’ve got figure out how to fix the issue - thanks for the heads up on OBD1 mercedeslimos - I’ll see what I can find or it’s off to diagnostics somewhere that can. pistolpete I had a look under the rear seat cushion on the right side but no relays. Where the heck did VW hide the ABS relays on this car? |
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Mar 10, 2018 23:35:39 GMT
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I pulled an entire ABS system out of one a few years ago. I was pulling the whole loom anyway for another car. The loom is 100% self contained and just plugs into the fuse box. AFAIK there are no relays, the modulator assembly contains the ECU with the relays inside like a modern car. My guess is the wheel spled sensors. Have you access to a multimeter? Can soon see if they’re alive or dead.
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Do away with the lights, fit a blank in their place from a base model 😉
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- '88 MK2 Golf 1.3 c
- '07 BMW E91 335d
- '94 T4 1.9d
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delux
Part of things
There's treasure everywhere!
Posts: 530
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Mar 11, 2018 13:05:12 GMT
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I think I’m going to find one in case @keironbrown  I pulled an entire ABS system out of one a few years ago. I was pulling the whole loom anyway for another car. The loom is 100% self contained and just plugs into the fuse box. AFAIK there are no relays, the modulator assembly contains the ECU with the relays inside like a modern car. My guess is the wheel spled sensors. Have you access to a multimeter? Can soon see if they’re alive or dead. Right so no relays then  I suppose the big giveaway to having ABS is the presence of the pump in the engine bay, I’m guessing that it’s not as simple as pulling out the pump & connecting up the brake lines is it? |
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Mar 11, 2018 18:19:11 GMT
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I think I’m going to find one in case @keironbrown I pulled an entire ABS system out of one a few years ago. I was pulling the whole loom anyway for another car. The loom is 100% self contained and just plugs into the fuse box. AFAIK there are no relays, the modulator assembly contains the ECU with the relays inside like a modern car. My guess is the wheel spled sensors. Have you access to a multimeter? Can soon see if they’re alive or dead. Right so no relays then I suppose the big giveaway to having ABS is the presence of the pump in the engine bay, I’m guessing that it’s not as simple as pulling out the pump & connecting up the brake lines is it? No such luck. No compensator in the rear brake system to counteract load proportioning as an ABS system does that internally. Easy to remake brake lines in copper or cupronickel. Very simple routing, and could split it which ever way you want it |
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delux
Part of things
There's treasure everywhere!
Posts: 530
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Mar 15, 2018 16:40:55 GMT
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Problem solved!
I tested both sensors and the resistance was just above 1000ohms for both. I also did a voltage test on the sensor with wheels turning and found that neither was measuring any current which made me suspect the reluctor rings...turns out both were spinning on the rear of the disks held in place by the strength of the magnet in the sensor...fitted new rings this morning and tested. Sure enough there’s voltage. Turned on ignition and abs light went out!
Took it for a spin around the block and ABS is now fully functional.
Thanks for everyone’s input!
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ChasR
RR Helper
motivation
Posts: 10,191
Club RR Member Number: 170
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Is that allowed now days? I thought removing ‘safety equipment’ was a no no. I believe you are right. If a good tester knows had ABS it will fail from May 2018 unless the car can be see to be a 'competition/rally' car. Make of that what you will. Your other choice is to find another tester... |
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mk2cossie
Club Retro Rides Member
Posts: 2,948 
Club RR Member Number: 77
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Mar 16, 2018 13:27:49 GMT
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Is that allowed now days? I thought removing ‘safety equipment’ was a no no. I believe you are right. If a good tester knows had ABS it will fail from May 2018 unless the car can be see to be a 'competition/rally' car. Make of that what you will. Your other choice is to find another tester... The ABS module/pump assembly is allowed to be removed still (and the offending pipes T pieced or remade). With the new draft of the MOT inspection manual (roadworthiness directive) it says about cars manufactured after 2018 (I think) not being allowed that option  |
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Problem solved! I tested both sensors and the resistance was just above 1000ohms for both. I also did a voltage test on the sensor with wheels turning and found that neither was measuring any current which made me suspect the reluctor rings...turns out both were spinning on the rear of the disks held in place by the strength of the magnet in the sensor...fitted new rings this morning and tested. Sure enough there’s voltage. Turned on ignition and abs light went out! Took it for a spin around the block and ABS is now fully functional. Thanks for everyone’s input! Hi! Sorry for bringing this thread back up. Had the exact same problem with my Mexico-made 96 GTI. Connected the Airbag/ABS lights and ABS constantly on. The Airbag lamp has blown so I don’t know whether it lights or not (waiting for a new part from eBay...). Will try what you did! Anyway, did you ever get the OBD-II-scanner to connect to the ECU? Mine starts up, meaning the contact works, but fails to read any moduls due to “linkage failure”. |
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delux
Part of things
There's treasure everywhere!
Posts: 530
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xfobe it’s a while back now... I think I needed an older OBD reader if I recall correctly. I think, and I’m open to correction here, that the mk3 GTi was OBD-1. I do remember buying a different hand held scanner.
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