diagnosis help

feelstranger feelstranger at hotmail.com
Fri Feb 10 05:33:25 PST 2012


I tapped into the harness at the ecu, and wired an LED test light.  Drove to 
work this am, watching the LED, and CEL.  Sure enough, idling in line at the 
gas pump, the CEL lit, and the LED stopped blinking.
Decided to shut it off anyway, pumped gas, and got back in.  First try, no 
start, no LED, CEL.
Second try It started - LED blinking away - drove all the way to work with 
out a CEL blink.
So, do I believe that both the original, and spare distributors/Hall senders 
are failing intermittently?  Not really.  Think I'll run a new pair of wires 
to the hall and see what happens.

-----Original Message----- 
From: feelstranger
Sent: Thursday, February 09, 2012 7:39 AM
To: 200q20v at audifans.com
Subject: Re: diagnosis help

Folks, wire diagram indicates ECU is grounded at ground point 137, and 138,
which are both "welded in motronic harness" -  Are these the grounds
connected to the intake mani just above the FPR?


-----Original Message----- 
From: Nathaniel Merrill
Sent: Wednesday, February 08, 2012 8:35 PM
To: 200q20v at audifans.com
Subject: RE: diagnosis help


More tests -
Ground at hall connector shows 0 resistance to ground.
Wires between hall connector and ecu test OK (0.5 Ohm)

Voltage between pins 1 and 3 (ground, and +) is only about 3 V, where it is
supposed to be 4.5 - 5.5.
Not sure what to think about that.  Bentley indicates "replace ECU"...
Need a test LED to see if a hall signal is getting though to ECU.

Car is starting regularly, but CEL still lighting.

Drive it to work, and take a chance?
Hmmm..


> From: feelstranger at hotmail.com
> To: 200q20v at audifans.com
> Subject: RE: diagnosis help
> Date: Wed, 8 Feb 2012 16:34:04 -0500
>
>
> Yes, cleared codes before test drive.  Seems like crank sensors are not 
> relevant since it runs fine as long as it starts.
>
>
>
> > Date: Wed, 8 Feb 2012 13:24:14 -0800
> > From: stincalise at yahoo.com
> > Subject: Re: diagnosis help
> > To: 200q20v at audifans.com
> >
> > Nat, did you clear the fault codes and it came back? I'd have a look at 
> > the crank sensors while you're at it. Dizzy timing mark could be off 
> > just a tick too.
> >
> >
> >  Austin
> > _______________________________________________
> > 200q20v mailing list http://www.audifans.com/mailman/listinfo/200q20v
>
> _______________________________________________
> 200q20v mailing list http://www.audifans.com/mailman/listinfo/200q20v

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