Go Back   AudiWorld Forums > Audi Models > Audi A4 > A4 (B5 Platform) Discussion
Sign in using an external account
Register Forgot Password?


A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

Welcome to AudiWorld Forums!
Welcome to AudiWorld.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the AudiWorld Forums community today!


Reply
 
 
 
 
LinkBack Thread Tools Search this Thread Display Modes
Old 03-21-2014, 06:24 PM   #1
Audiworld Junior Member
Account #: 279548
 
Join Date: Mar 2014
Posts: 10
Default a4 b5 1.8tq manual wont start

Hi everyone, long time reader first time poster.
Have an issue with the car not starting.

It failed to start the other day but after pressing on the gas while cranking it started eventually.
Today im out of luck, not matter what im trying still wont start.
It doesnt crank and it seems like it might start but never gets there.

After reading up on common issues this is what I have done thus far. Im not a mechanic but a DIY guy.

Checked battery voltage (over 12.5v+)
Checked fuses, fuel pump, control unit are fine.
Checked fuel pump relay under steering wheel, cleaned the contacts but still no go.
Checked voltage of fuel pump and control unit fuse, roughly 3.5v+ volts with ignition on and over 9v+ when cranking.
Checked voltage of fuel pump connector, 3.5v+. Didnt test when cranking yet.

One thing I noticed is that there is no longer that fuel pump engaging sound when turning the ignition.
Took a 9v battery and try to manually start the fuel pump but nothing. Am i connecting to the right contacts? (the outer ones, that connect to the green/yellow and the across from that the brown)
Also tried using a 12v source but still no go, doesnt seem to turn on. Im thinking its the fuel pump.

There was nothing new with the codes through the ODBII reader, had P0411 code only which was on before and the car was running great.

When connecting the VAG tool i got the following.

Has anyone experienced this? I would appreciate your suggestions on next steps.

16795 - Secondary Air Injection System: Incorrect Flow Detected p0411 35 - 10
16395 - Bank 1: Camshaft A (Intake): Retard Setpoint not Reached (Over-Advanced) p0011 35 - 10
16712 - Knock Sensor 1 (G61): Signal too High
p0328 35 - 10
18010 - power supply terminal 30: voltage too low - p1602
35 - 10 intermittent
17645 - Fuel Injector for Cylinder 1 (N30): Open Circuit
p1237 35 - 00
17647 - Fuel Injector for Cylinder 3 (N32): Open Circuit
p1239 35 - 00
17648 - fuel injector for cylinder 4 (N33): open circuit
p1240 35 - 00
17646 - Fuel Injector for Cylinder 2 (N31): Open Circuit
p1238 35 - 00
exclusivebiz is offline   Reply With Quote
Old 03-22-2014, 01:40 AM   #2
Audiworld Junior Member
Account #: 277148
 
Join Date: Feb 2014
Posts: 39
Default

Provided you are using a good 12v supply to try and power up the fuel pump, there is no reason it should not run, other than it is faulty. You should be going across the 2 thicker wires on the connector, or try directly onto the pin contacts with the connector unplugged.
gsjohal is offline   Reply With Quote
Old 03-22-2014, 07:08 AM   #3
Audiworld Junior Member
Account #: 279548
 
Join Date: Mar 2014
Posts: 10
Default

Hi, I tried already but not 100% sure that im connecting it properly. I putting positive to the pin which connects to the green yellow wire. Is the brown next to it the ground, or the one across from it?

Would this be a reason why I got all those codes?
exclusivebiz is offline   Reply With Quote
Old 03-22-2014, 12:12 PM   #4
Audiworld Junior Member
Account #: 277148
 
Join Date: Feb 2014
Posts: 39
Default

The thicker brown wire will be the earth/ ground for the pump. The other 2 wires will be for the fuel tank level sender, for the gauge. Make sure you go across the 2 larger pins.The injector faults are prob due to them being, disabled by the ecu, when the pump was unplugged for testing. The others I can't say for sure but would erase them and monitor them. If you can't get the pump to run, it's def faulty. Especially if you can't hear it priming when the ignition is turned on.
gsjohal is offline   Reply With Quote
Old 03-22-2014, 12:25 PM   #5
Audiworld Junior Member
Account #: 279548
 
Join Date: Mar 2014
Posts: 10
Default

Just finished manually testing the pump again, properly, this time it turned on. So this shows the pump is fine right?
Plugging the connector back in and turning the ignition and cranking I can hear the pump doing something.
I checked the fuel pump relay and when I put my fingers on it does click when turning ignition.
Car still doesnt start, not sure what else I should check.
exclusivebiz is offline   Reply With Quote
Old 03-22-2014, 03:02 PM   #6
Audiworld Junior Member
Account #: 277148
 
Join Date: Feb 2014
Posts: 39
Default

Yeah sounds like the pump works but are you actually getting fuel to the injectors ? I would remove the fuel supply hose to them and confirm. If fuel is being delivered when cranking, then next check for a spark.
gsjohal is offline   Reply With Quote
Old 03-22-2014, 07:20 PM   #7
Audiworld Junior Member
Account #: 279548
 
Join Date: Mar 2014
Posts: 10
Default

Hi, do you mean just remove the fuel supply hose that is going to the rail, place it in some bucket and then try cranking or remove all injectors and crank then?
Thanks
exclusivebiz is offline   Reply With Quote
Old 03-23-2014, 09:14 AM   #8
Audiworld Junior Member
Account #: 277148
 
Join Date: Feb 2014
Posts: 39
Default

Quote:
Originally Posted by exclusivebiz View Post
Hi, do you mean just remove the fuel supply hose that is going to the rail, place it in some bucket and then try cranking or remove all injectors and crank then?
Thanks
Just remove the supply hose, not the injectors, you just need to confirm fuel is getting to the engine.
gsjohal is offline   Reply With Quote
Old 03-23-2014, 12:39 PM   #9
Audiworld Junior Member
Account #: 279548
 
Join Date: Mar 2014
Posts: 10
Default

Hi, I disconnected the fuel supply hose, cranked it and there is fuel coming out. So I guess fuel is not the issue.
Next I will check for spark.

Anything else besides that for now?

Thanks
exclusivebiz is offline   Reply With Quote
Old 03-23-2014, 02:13 PM   #10
Audiworld Junior Member
Account #: 279548
 
Join Date: Mar 2014
Posts: 10
Default

Also after removing the spark plugs i see they are wet from fuel.
exclusivebiz is offline   Reply With Quote
Old 03-23-2014, 02:13 PM
AudiWorld
Audi R8




Paid Advertisement
 
 
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 01:08 AM.


Copyright 2014 AudiWorld.com Audi Enthusiast Community

Personal Contacts

SEO by vBSEO ©2011, Crawlability, Inc.