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D2 - Axles, Brakes, Suspension and Steering Brakes, Springs, shocks, steering racks, steering columns, suspension arms, wheel hubs etc. |
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Thread Tools | Display Modes |
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ABS/Gear Recognition Signal
Last couple of times i have taken the '8 out I have experienced an ABS alarm on the dash when pulling away in a "spirited" fashion. It first occurred when turning left or right onto the road but now occurs when taking off straight ahead. Just scanned the car and VCDS indicates the following:
----------------------------------- Address 03: ABS Brakes Labels: 8D0-907-389.lbl Part No: 4D0 907 389 E Component: ABS/ESP allrad D57 Coding: 08397 Shop #: WSC 02313 VCID: 31620445FBE4C6C269-5102 1 Fault Found: 01119 - Gear Recognition Signal 35-10 - - - Intermittent --------------- However the Transmission Module says: Address 02: Auto Trans Labels: 01L-927-156.lbl Part No: 4D0 927 156 EC Component: AG5 01L 4.2l5V RdW 1010 Coding: 00111 Shop #: WSC 02314 VCID: 6ED8DF392A5A993A34-50E6 No fault code found. ---------------------------------------------- My first thought was ABS sensor. Any suggestions? (F125 was replaced with pukka unit Nov 2016)
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2002 D2 S8 Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18 Avus, ski hatch, Bose, auto dim rear view mirror, rear blind. |
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F125 needs doing again then
Hmm I had another thought - is it down on power when the light comes on? Just wondering if its the brake light switch - that can cause some odd effects, but I can't remember which code it generates. I made a post about solving it in mine and how to adjust it properly but I have no idea which thread it was in Last edited by MikkiJayne; 7th February 2019 at 03:01 PM. |
#3
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Quote:
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2002 D2 S8 Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18 Avus, ski hatch, Bose, auto dim rear view mirror, rear blind. |
#4
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The red exclamation mark? That's an odd response. Usually it doesn't care about that code - it happens a lot on some cars when you use tiptronic - never really figured out why, although its probably the F125 on those too. I'd pull it apart and clean up the contacts then spray them with contact grease and bolt it back together. Mine is the original and has been fine since I did that 2 years ago.
I have a couple here that I've been meaning to refurb. I could do one on part ex if you like The brake switch reduces power since it can't tell if you're braking or not so its not that. Does that code definitely come back each time? Is it also showing the yellow fault light? |
#5
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I've just had a dig through my old fault code notes and garage invoices because I've had a number of different ABS faults over the years and that code sounded familiar ...
I have a record of exactly the same fault code, dated September 2013: Quote:
Quote:
In my case it turned out to be a faulty ABS pump. Hopefully your fault might turn out to be something else David (because a new pump is a tad expensive, IIRC). I'm fairly certain I had no further work done after replacing the pump and that none of the above fault codes returned. It's possible that some of the fault codes are common to different ABS faults of course and you may experience different symptoms. When my ABS pump started to fail, the symptoms I experienced were similar to that of an iffy ABS sensor, in that it would randomly trigger the ABS light, particularly during braking. Initially it was very infrequent and only after driving for a good 20 minutes or more. Whenever the fault occurred, I could immediately reset the ABS light (by stopping and turning the ignition off-on) and it would usually stay off for another 20mins or more.
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Mark ------------------------------------------------------ 2002 FE S8 Ebony Black Pearl ------------------------------------------------------ ------------------------------------------------------ Cars Owned: The Tesla Era: 2020 Model S Performance Ludicrous+ (present) (Black, with all black premium interior and carbon fibre dιcor, 21" sonic carbon twin turbine wheels and FSD capability) The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present) The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust |
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Thanks for the comments and suggestions.
It is the large red "Fault in Brake System" (the red circle with "brake pads" and exclamation mark inside) warning that comes on. I've just taken the 8 out again to check a few things out. 1. The warning cuts in on acceleration when the revs hit around 3800/4000 (in Auto) but before it changed down a gear. It happens 8 or 9 times out of 10. 2. It happened less when i switched to Tiptronic - but still did occur 1 in 5 times. 3. There is no yellow fault light. 4. Due to my accelerating runs there were times when I had to brake a tad harshly and i'm not sure that ABS is actually working. A couple of times I locked one or more wheels and there was none of the usual ABS pedal feedback. Not yet keen to get the F125 removed (I cannot do it on the driveway) and then drill it apart! It shouldn't have failed in two years..... but it does look like it may be the culprit PS. having cleared the DTCs this afternoon I'll check tomorrow what they say after tonight's run..
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2002 D2 S8 Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18 Avus, ski hatch, Bose, auto dim rear view mirror, rear blind. Last edited by David's8; 7th February 2019 at 06:39 PM. Reason: added PS |
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Had a chat to Neil about something similar a while back, when I mentioned that my D2 had been SORNed since last May. He said that the F125 switch doesn't like sitting around doing nothing, and one he had replaced also caused problems.
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts Sold! 2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II Headlights My DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds |
#8
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Quote:
PS. Why does the code show up in the ABS module rather than (or as well as) the TCU?
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2002 D2 S8 Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18 Avus, ski hatch, Bose, auto dim rear view mirror, rear blind. |
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