Date: Thu, 30 Oct 2003 23:19:35 -0800
Reply-To: Robert Keezer <warmerwagen@HOTMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Robert Keezer <warmerwagen@HOTMAIL.COM>
Subject: Re: Question About ECU Programing
Content-Type: text/plain; format=flowed
Loren, what VW model are you driving? I think I guessed you drive a Eurovan?
The only system I know that adapts to city or highway is Motronic, like the
system that runs the 93-later Golf-Jetta, Eurovan, Passat, etc.
But this is not after disconnecting the power.
Disconnecting the power on Motronic will clear the fault code memory and the
managment "map" memory that the ECU has adapted for that particular driving
habit, whether it be city or driving.
Also other adaptations are lost, like those compensations the ECU makes for
plug gap wear etc , when the power is disconnected. It takes the ECU aboput
ten minutes to re-learn and adapt after disconnecting.
If you drive a Eurovan you have Motronic . The VSS(vehicle speed sensor )
infomation is a important input for adaptation. If the ECU receives constant
road speed data for a specific amount of time, like ten minutes or more of
non-stop highway driving, there is no need to pull over to reprogram
anything. The ECU looks at the road speed data and converts to the highway
speed" map "for optimal performance .
Constant load and rpm for a given amount of time signals the ECU to use
highway cruising mode, liekwise in stop and go city rpm and load data prompt
it back to city mode. No need to switch anything.
Robert
1982 Westfalia '95 Golf powered
----Original Message Follows----
From: "Loren A. Busch" <lbusch@IX.NETCOM.COM>
Reply-To: "Loren A. Busch" <lbusch@IX.NETCOM.COM>
To: vanagon@GERRY.VANAGON.COM
Subject: Question About ECU Programing
Date: Thu, 30 Oct 2003 21:09:15 -0800
Let me pose a hypothetical to the list:
I'm familiar with the instructions for 'reprogramming' the ECU after the
power has been disconnected. These instructions imply that the ECU will set
itself up for the type of driving that is being done. That further implies
that there is a possibility of getting 'best performance for conditions' if
you were to 'program' the ECU based on anticipated 'most of the time'
driving conditions. EG: I'm planning on a long trip at highway speeds and
conditions, so just before I pull onto the freeway I stop, disconnect the
battery for a couple of minutes, reconnect it, start up, pull onto the
freeway, and proceed with my trip. When I get home and know that I'll be
doing all my driving around town for the next few weeks I repeat the process
but go about my normal 'in town' driving patterns.
Now, for those of you that better understand to way the ECU works, would
what I just described make any difference, good or bad?
_________________________________________________________________
Send instant messages to anyone on your contact list with MSN Messenger
6.0. Try it now FREE! http://msnmessenger-download.com
