200q20v digest, Vol 1 #848 - 9 msgs

Derek Pulvino dbpulvino at hotmail.com
Mon Apr 1 11:09:07 EST 2002

If hall sender is culprit in your no-start episode there will be no
signal/pulse at the connection to the distributor.  Check Scott Mockry's
site for more details on the troubleshooting procedure.  I think his info
listed is for the 10v's but procedure is the same.

RPM sensor code is related to checking fault codes with the car not running.
  As to the idle swithc, while I'm not 100% on this, if that switch has a
problem, and for some reason isn't doing what it should be (I believe
circuit is closed when throttle body gets to idle position), that could also
cause a problem as I believe that swithc is used to tel the engine when to
open up the fuel supply to the engine again on decceleration.  Designed to
conserve gas.

Derek P

Message: 9
Date: Mon, 01 Apr 2002 18:36:37 +0200
To: quattro at audifans.com, 200q20v at audifans.com
From: Mihnea Cotet <mik at info.fundp.ac.be>
Subject: 200q20v still not starting...Hall sensor testing?

It's me again :-)

I just repaired temporarily the intercooler with JB Weld because the inlet
endtank was cracked and had a nice false air intake in it...so no more air
mass and O2 sensor codes but "Idle switch" and "Hall sensor" codes are
still present... I'll degrease the distributor as well as I'll be able to
tomorrow with brake cleaner and give it another try.... I also had an RPM
sensor code wich, I suppose, could be there because of the  no-start
condition, am I right? Shouldn't I also get the Crank Position sensor code
in these conditions?
Does anyone know how to test a Hall sensor? How should I measure it, test
it with a LED, etc???

Thanks for your help, the IC was indeed one of the main culprits....

Regards from sunny Belgium,


'85 Coupe quattro
'90 200q20v cranking over but not starting yet :((((

Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp.

More information about the 200q20v mailing list