Differential Pressure Regulator - just the facts

Ben Swann benswann at comcast.net
Tue Feb 3 10:19:50 EST 2004


I am only reporting what is printed in a factory  Audi Service Training
manual for CIS-E3/2.3l
engines.  I think the part no. changes more to reflect year rather than
actual major differences in the part.  I found one cis-e DPR with the same
part no. as on the CIS-EIII's I checked.

Here is what the manual says. "The regulator and its operation is the same
as used on CIS-E fuel injection.  The operating range during closed loop or
oxygen sensor regulation has, however, been changed.  The operating range is
now +10mA to -10mA.  The nominal CO adjusting point is now 0mA.  This helps
to insure better engine operation if an electrical failure should occur by
providing a fuel mixture which is in the range of the nominal setting."

I did check resistance for several(6), incl. cis-e, cis-e3and resistance
typically between 18 and 22 ohm.

Just reporting my findings - you may interpret them as you like.

----- Original Message ----- 
From: "Brady Moffatt" <bradym at sympatico.ca>
To: "Ben Swann" <benswann at comcast.net>; "Marc Boucher"
<mboucher70 at hotmail.com>
Cc: <antar at comcast.net>; <suffolkD at aol.com>; <quattro at audifans.com>
Sent: Tuesday, February 03, 2004 9:07 AM
Subject: RE: Differential Pressure Regulator[was No start WAS: Fuel

> They're not the same part, since the CISE3 fluctuates around 0mA while the
> CISE does it around 10mA.
> Cheers,
> Brady
> Urq, 4kq, Z
> -----Original Message-----
> From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com]On
> Behalf Of Ben Swann
> I assume we are referring to the Differential Pressure Regulator.
> The CIS-E unit can be exchanged with CIS-EIII as they are the same part
> least according to CIS-EIII Factory Service Training manual).
> Ben

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