Audi A3 wont start
02-11-2006, 02:22 PM
#1
Audi A3 wont start
Got a problem with our Audi A3, its a 1998 model S-reg, thought someone on here may have an idea 
Car was sat for about 2 months with no use, and obviously came back to find a dead battery.
Tried jumping it but it just cranks over and doesn't fire.
Have checked for spark, its sparking.
Have renewed the petrol with fresh stuff.
Now, the problem is it isnt fueling. When you turn the ignition on the fuel pump doesnt prime, and when you try to crank it no fuel comes through.
Have tested the circuit and there is no power going to the fuel pump fuse, so the problem lays between the battery and the fuse.
In between these is the relay? I've replaced that to no avail.
If you give a live feed to the fuse then the car starts and idle's happily, so the fuel pump works!
The problem is definately before the fuse but not the relay, what can it be?
Any other fuel cuts on there?
Car was sat for about 2 months with no use, and obviously came back to find a dead battery.
Tried jumping it but it just cranks over and doesn't fire.
Have checked for spark, its sparking.
Have renewed the petrol with fresh stuff.
Now, the problem is it isnt fueling. When you turn the ignition on the fuel pump doesnt prime, and when you try to crank it no fuel comes through.
Have tested the circuit and there is no power going to the fuel pump fuse, so the problem lays between the battery and the fuse.
In between these is the relay? I've replaced that to no avail.
If you give a live feed to the fuse then the car starts and idle's happily, so the fuel pump works!
The problem is definately before the fuse but not the relay, what can it be?
Any other fuel cuts on there?
02-11-2006, 02:31 PM
#2
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call an audi dealer mate and see if they can say over the phone if not call AA and say it has broke down, they will stick a diagnostic pc on it and may tell you wats wrong 
02-11-2006, 02:41 PM
#3
had the aa out twice now, first time they said low oil ( 
I wasn't there at the time) and the second time they tested it all and said must be the fuel pump relay.
and now here i am, it aint the relay
may get em out again tomorrow but will try audi
I wasn't there at the time) and the second time they tested it all and said must be the fuel pump relay.and now here i am, it aint the relay
may get em out again tomorrow but will try audi
02-11-2006, 02:58 PM
#5
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Just had a word with out master tech here mate, he said its difficult to say, but could relate to the ignition switch
he said try moving the key round in it, as usally where then go, they dont spring back and the normal turning movement in the barrel from 1-2-3 feels strange
he said try moving the key round in it, as usally where then go, they dont spring back and the normal turning movement in the barrel from 1-2-3 feels strange
02-11-2006, 03:00 PM
#6
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Gonna be difficult mate, but might be worth sticking it on diagnostic to see if it brings up anything, ive got the software for it but not that close 
02-11-2006, 03:03 PM
#7
thanks for that mate, as far as i can remember the barrel felt normal, but i will give it a go!
would what he suggests still be true bearing in mind it works when giving a live feed to the fuel pump fuse?
Guess I'll have a small play tomorrow then get the aa out again! although i guess now its this complicated they wouldnt be able to suggest much, other than a tow to audi?
would what he suggests still be true bearing in mind it works when giving a live feed to the fuel pump fuse?
Guess I'll have a small play tomorrow then get the aa out again! although i guess now its this complicated they wouldnt be able to suggest much, other than a tow to audi?
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02-11-2006, 03:11 PM
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true, ive not got the wiring diagrams for it infront of me and evreything 
the other suggestion is that the feed from the control unit that powers the relay is at fault, or its not earthing
the other suggestion is that the feed from the control unit that powers the relay is at fault, or its not earthing
as they were beeing explianed to me and i was a bit
02-11-2006, 03:33 PM
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Originally Posted by ballin
page 2 you sent, is that the main ecu or does it have a seperate fuel ecu? (and if so do you know where it is?)
hope the ecu isnt fried
02-11-2006, 03:41 PM
#22
that would be good mate thanks for all your help!
having a little trouble reading the diagram for the ecu, is J17 (fuel pump relay) the one above the black box at the top of the diagram?
if so what is it? how can i test it?
i assume its a pin out? should it be earthed or live when ign is on? or dont it say?
having a little trouble reading the diagram for the ecu, is J17 (fuel pump relay) the one above the black box at the top of the diagram?
if so what is it? how can i test it?
i assume its a pin out? should it be earthed or live when ign is on? or dont it say?
02-11-2006, 03:45 PM
#25
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J17 23/87 is the one above the black box, sorry thats the highlighting over it
its the fuel pump replay, that should be live when the ignition is cranking
pm me your reg and i'll make sure these are 100%
its the fuel pump replay, that should be live when the ignition is cranking
pm me your reg and i'll make sure these are 100%
02-11-2006, 03:55 PM
#26
ygpm !
just to clarify as the image is a little fuzzy, out of the ECU on pin 4 is it (?) there is a wire running to the fuel pump relay, and this provides the power to the relay?
so the power to the relay comes from the ecu? cant see what colour the wire is, is it on there?
just to clarify as the image is a little fuzzy, out of the ECU on pin 4 is it (?) there is a wire running to the fuel pump relay, and this provides the power to the relay?
so the power to the relay comes from the ecu? cant see what colour the wire is, is it on there?
02-11-2006, 04:09 PM
#28
ah okay, unforunately not, boring 1.6 ! It's the early 1998 one as well apparantly, WX chassis number or something? had this little problem yesterday trying to get the right relay, turns out they changed late 98 or something, and mines the earlier.
02-11-2006, 04:15 PM
#33
gonna be fun, can hardly get in there as it is, let alone trace the wires
sorry, is it purple or white, or purple/white?
Just had a quick look at the relay, I've got pins 85,86,87,30
looking at the diagram, pin 87 should be live yeah?
(sorry for all the qs)
sorry, is it purple or white, or purple/white?
Just had a quick look at the relay, I've got pins 85,86,87,30
looking at the diagram, pin 87 should be live yeah?
(sorry for all the qs)
and one of those for 1001 posts 