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| D2 - Interior Electrics Airbags, Sensors, climate modules, instrument clusters, switches etc |
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#1
3rd August 2013, 06:36 PM
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Speed signal from abs or cruise control? to my RS8 biturbo ecu
I have an Audi S8 -97 manual with RS6 engine but I have a fault code (16885) in the RS6 ecu that it is missing a speed signal.
So were can I find a speed signal in Audi A8/S8 94-99 ? The cruise control must have this? but i don't know cable colour or where I can find this cable in my car? Maybe also the ABS or clima have a speed signal? And perhaps it is an speed signal output on the instrument cluster does anyone know this?
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Owns at the moment:  S8-97 biturbo = RS8 My new trackday car  A8-94, A8-96, A6 1.8tq -2004 2 Urquattro 20v-90 one red, one blue, and one old Urquattro ex rallycar, and some other cars..  
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#2
4th August 2013, 05:55 PM
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There are a couple of speed signals input to the ecu. Abs Sensors at each wheel and output shaft on the transmission. There are also a couple of engine speed signals, input shaft, cam position and fly wheel hall sender. The ecu uses all of the for different functions.
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Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light.
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#3
5th August 2013, 08:29 AM
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But the question is where are these cables in my car?
My cruise control does not work anymore because it's electricity gas throttle on the RS6 engine so therefore I can take the cable that goes to the cruise control and link it to my RS6 ecu, but where can I find the ecu to the cruise control and which cable is what I should be looking for? Anyone have a diagram of the wires to the cruise control ecu ?
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Owns at the moment: S8-97 biturbo = RS8 My new trackday car A8-94, A8-96, A6 1.8tq -2004 2 Urquattro 20v-90 one red, one blue, and one old Urquattro ex rallycar, and some other cars..
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#4
5th August 2013, 08:35 AM
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The cruise control in that era S8 is a separate module which I presume operates a servo (vacuum driven?) of some sort as the throttle pedal physically moves. It is optional.
Later models are fly-by-wire and the cruise function is integrated into the engine ECU so you "just" need to add the stalk/switches. What vintage of engine ECU are you using and is it designed to work with a separate servo cruise control, or are you trying to bypass that?
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant. 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one!  Finally: gone, but not forgotten..... 1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! 
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#5
5th August 2013, 08:43 AM
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I don't want my cruisecontrol to work!
I only wan't to get a (km/h and mph) speed signal from any cable in my Audi S8-97 I have an RS6 BCY engine with RS6 ecu and this ecu is missing a speed signal = I have a fault code (16885=speed signal) in the RS6 ecu and my tuning company that will remap it for 500hp+ want me first to fix this cable to my ecu so I get rid of this fault code..
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Owns at the moment: S8-97 biturbo = RS8 My new trackday car A8-94, A8-96, A6 1.8tq -2004 2 Urquattro 20v-90 one red, one blue, and one old Urquattro ex rallycar, and some other cars..
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#6
5th August 2013, 09:51 AM
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Vehicle speed reading on 1997 8 is generated from speed sensor on gearbox output and processed in instrument cluster which then passes processed speed signal to ECU, ABS, cruise control, gearbox, radio, climate control, servotronic steering, satnav , ect.
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure
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#7
5th August 2013, 10:05 AM
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Quote:
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Owns at the moment: S8-97 biturbo = RS8 My new trackday car A8-94, A8-96, A6 1.8tq -2004 2 Urquattro 20v-90 one red, one blue, and one old Urquattro ex rallycar, and some other cars..
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#8
5th August 2013, 10:18 AM
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Looks like signal comes in the instrument cluster on pin 24 on the red connector and goes out the same connector:
ECU pin 19 gearbox pin 9 ABS pin 13 and pin 23 for everything else ( radio, climate control, servotronic, cruise control.etc)
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure
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#9
5th August 2013, 09:28 PM
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If you want it easy there is always the GALA feed on the back of the Audio unit. It should be clearly marked on the radio......
Its not as frequent a pulse as the ABS generated ones though iirc, but might do depending on what you need, its designed to alter the volume of the radio as speed changes to compensate for road noise etc.
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For parts enquiries and Forum User Administration please contact customer services directly, not me  - enquiry@a8parts.co.uk, www.a8parts.co.uk, or call 01642 783537The Daily Town Car - 2023 Tesla Model Y Performance. Black with Black. Giant ipad screen, huge sunroof, 4 wheel drive, Tow bar, lots of ooomph and made in China, so actually built properly unlike the Californian ones. The Family Wagon - 2018 Tesla Model X. Black, 7 Seats, Towbar, Homelink, Enhanced Auto pilot with Summon and self park, Heated front seats, CCS Charger upgrade, MCU2 Upgrade, Falconwing Doors, Self opening / closing doors, Netflix, Spotify, toys, Air suspension, alcantara roof + lots of other stuff...... The 17 year old Driver Wagon 2015 Skoda Citigo Monte Carlo. Alloys, Power steering, Aircon, Leccy windows, Sat Nav, bluetooth, central locking, cup holders, 59 whole bhp. Million times better than my first car. Well jealous..... The First 20 Audis: 2001 D2 4.2 QS Silver, 1997 D2 S8 Silver, 1999 D2 4.2 Silver, 2002 D2 S8 Dolphin Grey, 2003 C5 RS6 Blue, 1998 D2 S8 Black, 2000 D2 4.2 QS/S8 Ming Blue, 2003 D3 4.2 Ming Blue, 2005 B7 S4 Blue, 2006 D3 3.0 Tdi Black, 1999 D2 4.2 Silver, 2003 D3 4.2 LPG Crystal Blue, 2000 D2 S8 Silver, 2007 3.0 Tdi Q7 Black, 2009 B8 S4 Black, 1998 D2 S8 Agate Grey, 2006 D3 4.2 Tdi Blue, 2006 D3 S8, 2007 Q7 3.0 Tdi, 2006 C6 S6, The Second 20 Audis: 2011 A7 Sline, 2001 A2 1.4 Tdi Black, 2002 A2 1.4 Tdi Silver, 2006 A8 4.2 Tdi Blue, 2007 4.2 Tdi Q7, 2006 S4 Cab Silver, 2010 RS6 Saloon Black  , 2007 TT Roadster, 2010 A8 D4 4.2 Silver, 2006 C6 A6 2.7 Tdi Quattro, 2000 D2 4.2 QS/S8 Ming Blue (again), 2008 Q7 4.2 Black, 2009 C6 RS6 Saloon Daytona Grey, 2001 Fully Loaded A2 Tdi, 2006 Avant S6 Black, 2007 VW Caravelle Exec Black (almost an Audi) 2009 TT Roadster Daytona, 2015 Q7 4.2 tdi lava grey, 2002 GmbH D2 demonstrator, 2006 D3 A8 LWB 4.2 Tdi Black Most Recent Audis: 2001 A2 1.4 Tdi Black, 2007 4.2 FSi Q7 ABT Blue, 2016 S5 Coupe Launch model, 2004 S4 B6 Cabriolet, 2016 Q7 Sline White, 2006 Q7 4.2 FSi Black, 2012 Q7 Sline+ 4.2Tdi White, 2008 Blue Audi S8 Everything Else 1989 Subaru Justy, 1986 Vauxhall Cartlton 2.0 GL, 1985 Vauxhall Carlton 2.2 CDi, 1987 Ford Sierra XR4x4, 1983 Vauxhall Senator, 1985 Vauxhall Senator 3.0i, 1997 Polo Saloon, 1997 Peugeot 306 1.9 TDi, Ford Sierra Sapphire 2000E, 1990 Subaru Justy, 2000 Subaru Impreza, 2000 Subaru Impreza RB5, 1993 Range Rover LSE, 2005 VW Bora, 2003 Skoda Superb, 2003 VW Passat V6 4 Motion, 1996 Peugeot 106, 2000 Range Rover 4.0, 2019 Tesla Model 3 Performance
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#10
6th August 2013, 07:16 AM
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Quote:
On my red contacts I have these colors: Pin 19 green / white Pin 23 White / Blue Pin 24 yellow / white So now I just have to find out where these wires go. I will start to look for 19 and 23 ,
__________________
Owns at the moment: S8-97 biturbo = RS8 My new trackday car A8-94, A8-96, A6 1.8tq -2004 2 Urquattro 20v-90 one red, one blue, and one old Urquattro ex rallycar, and some other cars..
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