90 90 no fault codes.

[Mark Rutherford]

Exactly, but in my case I get no codes.  Kind of stumped here.  I have
always done all of the work on my Audi's including major work ( engine
transplants, head gaskets, familiar with pulling codes, etc.).  

I think in the end I will find that the hesitation problem is in the
ignition system ( knock sensor, ignition module, hall sensor).
Additionally, I do not know if the code issue is related to the hesitation
problem, but it seems like a logical place to start.

Thanks for the idea's 
Mark  

-----Original Message-----
From: Al S [mailto:streichea001 at hawaii.rr.com] 
Sent: Monday, April 19, 2010 7:42 PM
To: Mark Rutherford; 'pdooley'; 'Quattro List'
Subject: Re: 90 90 no fault codes.

Just to reiterate Connect wires to under dash connectors, turn ignition "on"
hold the two "ground" wire together for 4 seconds,
Release
Codes will flash
ground wires again for next code.

Sorry if I have repeated what has already been done.
Al

--------------------------------------------------
From: "Mark Rutherford" <mark.rutherford at emerytelcom.net>
Sent: Monday, April 19, 2010 3:32 PM
To: "'Al S'" <streichea001 at hawaii.rr.com>; "'pdooley'" 
<psdooley at verizon.net>; "'Quattro List'" <quattro at audifans.com>
Subject: RE: 90 90 no fault codes.

> Fuse 21 is good.  I think it provided power to the diagnostic connector. 
> I
> have 12 volts at the connector, and a good ground on the other pin.
> Grounding the ECU wire results in the check engine light, and a LED
> connected between the 12 volt pin and the ECU pin coming on.  When 
> removing
> the ground it should begin the blink code sequence, some code if there is 
> a
> problem or 4444 if there is no problem.  In my case the check engine light
> and the LED go out but nothing else happens.
>
>
>
> -----Original Message-----
> From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] 
> On
> Behalf Of Al S
> Sent: Monday, April 19, 2010 4:53 PM
> To: Mark Rutherford; 'pdooley'; 'Quattro List'
> Subject: RE: 90 90 no fault codes.
>
> Check fuse #21 in the engine compartment.
>
> -----Original Message-----
> From: quattro-bounces at audifans.com
> [mailto:quattro-bounces at audifans.com]On Behalf Of Mark Rutherford
> Sent: Monday, April 19, 2010 1:57 AM
> To: 'pdooley'; 'Quattro List'
> Subject: RE: 90 90 no fault codes.
>
>
> Very possible, I have found and repaired 2 large leaks.  The hesitation
> started after these repairs.  The issue of no response from the ECU in
> diagnostic mode has me concerned.  I would like to see a 4444 code to 
> ensure
> me that the electronics are working properly.
>
> thanks
>
> Vacuum leak?
>
> -----Original Message-----
> From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] 
> On
> Behalf Of Mark Rutherford
> Sent: Sunday, April 18, 2010 9:37 PM
> To: 'Quattro List'
> Subject: 90 90 no fault codes.
>
> I have a 1990 90 FWD 90 that has developed a random hesitation while
> accelerating.  Went to pull the codes and get nothing, no 4444.
>
>
>
> I inserted a fuse into the fuel pump relay, no light in the dash.
>
> Replaced the bulb in the dash, inserted a fuse in the relay.  Check engine
> light came on.  Waited over 5 seconds removed the fuse and the light went
> out.  No codes, no 4444 nothing.
>
> Went to the diagnostic connector.  Inserted the LED and the resistor,
> grounded the ECU, LED came on.  Removed the ground, LED turned off and
> nothing happened.
>
> Tried the diagnostic connector again. Grounded the ECU, check engine light
> comes on.  After ground is removed nothing.
>
>
>
> Any Ideas?
>
>
>
> Thanks
>
> Mark Rutherford
>
>
>
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