Date:         Fri, 15 Oct 1999 08:17:36 -0700
Reply-To:     gholst@RAMBUS.COM
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Grant Holst <gholst@RAMBUS.COM>
Organization: Rambus inc.
Subject:      Re: Eurospec problems
Comments: To: David Marshall <vanagon@volkswagen.org>
Content-Type: text/plain; charset=us-ascii

David Marshall wrote:
>
> As per the Digifant wiring diagram that I emailed the list, the Digifant
> computer ground pin number 85 on the fuel pump relay.  Pin 86 goes directly
> to "15" which is "12V with key on"  a simple way to tell if this is working
> or not is disconnect the terminal 86 wire on the relay and run a test lead
> from 86 on the relay to 15 on the ignition coil.  This assumes that your
> coil is getting 12V when the key is on...
>
> At 01:31 PM 14/10/1999 -0700, Grant Holst wrote:
> >Does anyone know what energizes the coil in the
> >fuel pump relay? I think one side comes from the positive
> >side of the igntion coil and the other end goes to the ecu.
> >
> >Grant
> >
> >
>
> --   David Marshall -                    - Quesnel, BC, Canada   --
> --    78 VW Rabbit, 80 VW Caddy, 84 VW Westie, 85 VW Cabriolet   --
> --       87 Audi 5000 Quattro, 88 2.0L VW Syncro Double Cab      --
> -- David's Volkswagen Home Page        http://www.volkswagen.org --
> -- Fast Forward Autobahn Sport Tuning  http://www.fastforward.ca --
> -- david@volkswagen.org (pmail) or vanagon@volkswagen.org (list) --

David,
Eurospec wired the relays a little differently. Pin 85
is switched 12v but not off the coil pin 15. Pin 86 goes
to the computer. Pin 86 gets pulled low to turn the relay
on but goes high (> 6volts) after the pump has primed to shut
it off. This only happens when you switch the ignition on, not
while the engine is running. When the engine is running, pin 86
is low. I think with my hot start problem, the computer is not
pulling pin 86 of the fuel pump relay down low.
 Does anybody have a schematic for a '91 jetta ecu? or is this
a ridiculous question?

Grant