2000 A6 2.7 crank no start - AudiWorld Forums

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2000 A6 2.7 crank no start

 
Old 02-11-2019, 04:47 PM
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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.

Help?
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Old 02-11-2019, 04:51 PM
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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.
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Old 02-12-2019, 05:19 AM
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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.
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Old 02-12-2019, 06:56 AM
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Also it might be good to check the connections to the coils.
Maybe that would stop the ECU from turning fuel pump on .

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Old 02-12-2019, 07:04 AM
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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?
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Old 02-13-2019, 11:50 AM
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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.
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