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D2 - Interior Electrics Airbags, Sensors, climate modules, instrument clusters, switches etc |
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Thread Tools | Display Modes |
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#1
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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.. ![]() |
#2
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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. ![]() |
#3
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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.. ![]() |
#4
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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". ![]() ![]() 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. ![]() 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! |
#5
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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.. ![]() |
#6
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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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