On Fri, Nov 20, 2009 at 2:02 PM, David Beierl <dbeierl@attglobal.net> wrote: > At 04:33 PM 11/20/2009, neil n wrote: .... > Internally I imagine it runs on 12.0 +/- 0.5 and 5.0 +/- 0.25 volts, > although it's possible that the 12v part could be running at the van system > voltage. It can undoubtedly tolerate supply voltages of +16 volts, maybe > more, at least briefly. One thing it *won't* be happy about is unhooking FI > or ignition driver outputs while it's running (damage can be invisible and > cumulative, btw), and undoubtedly some or all of its pins are > static-sensitive when not connected into the van wiring.
Thanks David. Interesting point re: cumulative and invisible damage. So there's obviously something in the ECU circuitry that regulates and/or protects the voltage sensitive components from damage (within reason). Something similar to the Vanagon voltage stabilzer on the instrument cluster foil. I have an air cooled Vanagon ECU. Maybe I'll pop off the cover and have a look-see. Much simpler I'm sure, so maybe there's an obvious component visible. Neil.
-- Neil Nicholson '81 VanaJetta 2.0 "Jaco" http://tubaneil.googlepages.com/ http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines |
Please note - During the past 17 years of operation, several gigabytes of
Vanagon mail messages have been archived. Searching the entire collection
will take up to five minutes to complete. Please be patient!
Return to the archives @ gerry.vanagon.com
The vanagon mailing list archives are copyright (c) 1994-2011, and may not be reproduced without the express written permission of the list administrators. Posting messages to this mailing list grants a license to the mailing list administrators to reproduce the message in a compilation, either printed or electronic. All compilations will be not-for-profit, with any excess proceeds going to the Vanagon mailing list.
Any profits from list compilations go exclusively towards the management and operation of the Vanagon mailing list and vanagon mailing list web site.