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#1
7th December 2010, 01:25 PM
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Help - car has died.... ECU ??
Hi all,
Travelling along this morning and the oil level light popped on. So I stopped,topped up the oil but the light remained on. Definitely enough oil as read on the dipstick so thinking a faulty sensor I continued on my journey. About 20 miles later in traffic, just shunting at low speed and the car suddenly died. When attempting to restart it I had all the gears ( D,R,1,2,3,4 etc ) all lit up red. Engine management light and abs light also permanently on, it turns over but won't fire up. Just had fault codes read and the gearbox is saying missing command from ECU, Engine says missing command from ECU and any attempts to connect to the ECU directly fail ?? I've been told by a local garage that an ECU fault is plausible. Does a faulty component on the ECU seem likely ?? After my alarm horn exploits I'm quite keen to try to repair it myself as I've heard there can be problems with drains blocking and water getting in there, does this all seem plausible to you knowledgable bods ?? Worst case scenario I understand I'm looking at the best part of 1K to get a new one and I've seen some A8 ECU's on A8parts - Does anyone know if these are different units or are they just generic ECU's flashed with a different program ?? any help/advice from you chaps is much appeciated as I'm feeling really deflated now and IF there is a good time for car problems it certainly isn't 2 bloody weeks before xmas  Help .... 
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#2
7th December 2010, 01:37 PM
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If You cannot connect to ECU then it sounds like ECU or wiring/power problem. Which car is it? I have spare ECU for PF S8 AHC engine. I can also adapt immobilizer to accept new ECU if You are local.
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#3
7th December 2010, 02:16 PM
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Its a 2000 facelift S8... can't remember the engine code off hand.
I'm guessing the drain plugs have been blocked earlier in the cars life resulting in water getting at the ECU. Its annoying cos I'm really on the ball at keeping them clear since I've had it. Whilst waiting for recovery it did start on one occasion,ran for about 5 seconds then died again. With my electronic mind that just shouts dry solder joint to me, some kind of intermittent contact. My garage are going to get it out and try rebooting/reprogramming it but if that fails I'll have a look myself and see if there's any obvious pcb damage/dry joints/blown components etc Cheers for the offer tho mate  - You wouldn't happen to know if the ECU is different between models then would you ?, Would there be a difference between the FL A8 4.2 ECU and the FL S8 4.2 ECU ??
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#4
7th December 2010, 03:33 PM
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Quote:
__________________
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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#5
7th December 2010, 04:22 PM
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I've left the car with a garage so can't get to it to read the code - will it not be the same for any other 2000 FL S8 ?
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#6
7th December 2010, 04:43 PM
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I have found 5 ECUs for the AQH and 9 for the AVP engine you might have in a 2000 FL S8.
__________________
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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#7
7th December 2010, 04:54 PM
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ahhhhhh !!
Its an AQH so that narrows it down a bit I suppose - I'll find out the code when the garage gets it out ( and asks me to bend over   )
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#8
7th December 2010, 10:59 PM
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If you change the engine ECU, you need to recode the immobiliser on a 2000 car as it is bult into the keys, instrument cluster and Engine ECU....
As far as I'm aware, this is an Audi only job. They're unlikely to be happy to fit you a 2nd hand ECU and code it, but in my experience if you fit it, then tow it to Audi and claim your car 'wont start' they should code it up.. ...ah hem... unless you're real pally with the service manager in which case he might be more receptive to what you need.. I was pretty sure the oil level sender went direct to the instrument cluster though, not via the engine ecu, so it flagging up an error, wouldnt really tally with an engine ECU fault... Wonder if the gearbox ecu has gone.... its odd that its lit up all the lights like that.... Much easier to change over the gearbox ecu, just plug and play... no coding to worry about...
__________________
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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#9
8th December 2010, 05:04 AM
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cheers for the info IT.
If the gearbox ecu had died would I still have a problem connecting to the main ecu ?? As I can connect to gearbox and engine and they both chuck faults about missing command from main ecu?? As to it being an audi only job to recode the immobiliser would noone else be ablto do this. From online research there are companies that will repair/rebuild/reflash the ecu's and my local 'audi approved' garage made no mention to this being an issue...... Also I've been thinking, would the differing part numbers for the ecu's just account for a different program installed?, so the physical circuit board itself is identical and the presence of a certain program denotes the part number??
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#10
8th December 2010, 05:42 AM
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Ben at Shark Performance can do a lot with immobilisers and things only Audi 'should' be able to do, sorry to hear about your problems. I'm sitting in a hotel in New York, havent seen my 8 in two weeks but it will be waiting for me at Heathrow this weekend for a nice blast home, looking forward to it!
__________________
2009 Audi RS 6 Saloon V10 - 420mm Ceramics, Keyless, Soft Close, Adaptive Cruise, Glass Sunroof, Blinds, Twin Pane & UV, Freeview & DAB, High Beam Assist, MTM bits, Audi Exclusive Bits, MRC, Milltek, GYEF1 ASY2's, Bluetooth streaming music to AMI mod - 753 PS/1021 NM 2016 Audi S3 Saloon, Sepang, S-Tronic - B&O, Tech Pack etc... Company Car 1995 Audi A8 4.2 V8 quattro Sport - Bose, Solar, Blinds
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