2000 A6 2.7 crank no start - AudiWorld Forums

A6 / S6 (C5 Platform) Discussion Discussion forum for the C5 Audi A6 and S6 produced from 1998-2004

2000 A6 2.7 crank no start

Old 02-11-2019, 04:47 PM
Audiworld Junior Member
Thread Starter
Join Date: Aug 2015
Posts: 9
Default 2000 A6 2.7 crank no start

I'm on a long-haul epic-style diagnosis with my 2000 A6 Quattro 2.7 with tiptronic. The car is sitting at my house, and the engine will crank but not start. I don't hear any firing, either. There's no power on either fuse (#28 and 29, I believe) when the key is turned to the ON position. I've confirmed that the timing belt didn't break by opening the passenger side cover and eyeballing the belt while the engine was cranked. The battery was replaced within a week of the initial failure. About a week before the battery was replaced, there were two failed engine start attempts because the old battery didn't have enough CCA. At each of those failed start attempts, the engine started after getting a jump from another car's battery.

I've recently subcribed to alldatadiy.com to get the wiring diagrams, but I'm still stumped why the fuel pump relay is not engaging with the ignition key at the ON position. I pulled the fuel pump relay (#273?) and tested it good with a voltmeter while connecting the correct leads (#30 & T?) directly to the battery terminals.

jorg0370 is offline  
Old 02-11-2019, 04:51 PM
Audiworld Junior Member
Thread Starter
Join Date: Aug 2015
Posts: 9

A couple more notes: I replaced the passenger side camshaft position sensor twice after the failed start, once with a used one, and again with a new one. While cranking the engine, I read about 320RPM on my OBD scanner's live data.
jorg0370 is offline  
Old 02-12-2019, 05:19 AM
AudiWorld Senior Member
Join Date: Jul 2013
Location: In the Cloud
Posts: 1,360

I'm pretty sure that the fuel pump relay is picked by the ECU once it figures out that it is getting a good signal from the crank sensor. It does not pick with just the ignition key turned on. My guess is the crank position sensor.

Of course, I could be wrong, I'm not a professional.
georgeb944 is offline  
Old 02-12-2019, 06:56 AM
AudiWorld Member
Join Date: Jul 2017
Location: Portugal
Posts: 73

Also it might be good to check the connections to the coils.
Maybe that would stop the ECU from turning fuel pump on .

drpancho is offline  
Old 02-12-2019, 07:04 AM
AudiWorld Senior Member
Join Date: Jan 2004
Location: Ocean Isle Beach NC
Posts: 1,148

It is my understanding if the revs show on your tester when you are cranking then the crank position sensor is functioning. Is there anything you might have overlooked or not reconnected when you did the cam sensor?
clancy is online now  
Old 02-13-2019, 11:50 AM
Audiworld Junior Member
Join Date: Aug 2011
Location: Middle America
Posts: 9

I had a mysterious no-start crank on my '99 2.8L and I was about to tow it to my (Audi specific) mechanic - he asked me when I had changed the spark plugs (it had been at least 50,000 miles). Before towing he said "CHANGE THE PLUGS"... so, 6 NGK's later I started the car - fired right up. So....if you don't know the age of your plugs, or it's been 40,000+, give that a shot.
BoneMan is offline  
Related Topics
Thread Starter
Last Post
Kevin Lounsbury Sr.
New Member Welcome Area
10-20-2018 02:52 PM
A8 / S8 (D2 Platform) Discussion
08-19-2016 03:59 AM
A6 / S6 (C5 Platform) Discussion
01-08-2016 09:36 AM
A6 / S6 (C5 Platform) Discussion
07-22-2013 09:40 AM
A4 (B5 Platform) Discussion
09-21-2006 11:22 AM

Thread Tools
Search this Thread
Quick Reply: 2000 A6 2.7 crank no start

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: