AudiChan

Since I've recently had a startup problem, I went ahead and bought a $20 VAG-COM interface from eBay (instead of the $250-$350 interface + software package from Ross-Tech). Downloaded the ver 409.1 from Ross-Tech. Got it to interface and scan to some extend.

From what I read, I purchase/register the full version ($99) to access many other features... particularly the AutoScan. Yesterday was my first time trying to scan and it would stop after the "03 Auto HVAC module" due to the lack of full version. I thought I got around and scan from addresses 01 to 7F. Here's what I got:


Address 01: Engine
Protocol: KW1281
Controller: 4D0 907 557 D
Component: 4.2L V8/4V MOTR AT D05
Coding: 01273
Shop #: WSC 00000

Address 02: Auto Trans
Protocol: KW1281
Controller: 4D0 927 156 AN
Component: AG5 01L 4.2l4V USA D06
Coding: 00002
Shop #: WSC 00000

Address 03: ABS Brakes
Protocol: KW1281
Controller: 4D0 907 379 L
Component: ABS/EDS BOSCH 5 4171
Coding: 0265109043
Shop #: BB 34171

Address 08: Auto HVAC
Protocol: KW1281
Controller: 4D0 820 043 E
Component: D2-KLIMAVOLLAUTOMAT_D03
Coding: 00182
Shop #: WSC 00104

Skipping Address 15-Airbags

Address 17: Instruments
Protocol: KW1281
Controller: 4D0 919 035 H
Component: D2-KOMBIINSTRUMENT D42
Coding: 00283
Shop #: WSC 02314

Address 33: OBD-II
Protocol: ????
Controller: OBD-II/EOBD, Protocol Keyword: $0808

Address 35: Centr. Locks
Protocol: KW1281
Controller: 8L0 862 257 N
Component: CV-Pump, Alarm, RC D16
Coding: 16140
Shop #: WSC 00000


These are not the PXXXX faulty code that everyone reference from the DTC. Thus, I can't check any faulty code to see if my fuel pump or the fuel pump relay is causing my startup problem. My last post --> https://forums.audiworld.com/a8/threads/27181.phtml#149943

Any opinions would be greatly appreciated! I really want to confirm if I need to spend that extra $99. Thanks!

PaulW

When you have this problem, you need to crack the fuel fitting at the fuel rail and see if you have pressure.

If you don't, it's either the fuel pump relay (doubtful) or the fuel pump. A lot of times they die a slow death as you mention.

AudiChan

...checked the fuel line and no gas coming out... I thought it's fuel pump well, ordered one from junk yard, should get it this week.

Is there such thing as "fuel strain" built-in to the fuel pump or inline with the entire fuel pump assembly? My mechanic suggested me to get that fresh if I'm getting the fuel pump assembly used (from a 62K miles 97 A8Q)... but I couldn't find such "fuel strain" for the A8Q unlike in many Japanese & American cars.

Anyone thoughts?

PaulW

If you don't have the Bently manual, YOU NEED TO GET IT for this procedure. I've never done it, but it's pretty tricky.