Date: Wed, 16 Apr 2008 14:44:52 -0700
Reply-To: neil N <musomuso@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: neil N <musomuso@GMAIL.COM>
Subject: Re: Jetta relay questions (Vanagon conversion)
In-Reply-To: <48067014.9010808@earthlink.net>
Content-Type: text/plain; charset=ISO-8859-1
> Quite a job you have there figuring it all out. Hate to say it but getting
> a running donor and then pulling it apart yourself has major advantages in
> the end.
Too true.
I keep re-reading Bentley, and finding a little more at a time that
needs to be checked. There are two more wires I just noticed in
diagram that could be causing trouble.
The great news is that I'll be that much more familiar with a FI
system and related electronics (actually the only thing I've done on
any FI engine is replace hoses....) as I'm pretty much going through
each component.
The hardest part, it seems, is seeing numbers/letters properly. Bad
lighting whatever.
Must say, I've never put this much work and learning into a car. Ever.
Quite a "trip" from the learning end of things, but at least I'll be
better armed to deal with problems when they crop up.
Neil.
On Wed, Apr 16, 2008 at 2:31 PM, Mark Drillock <drillock@earthlink.net> wrote:
> That 94 Jetta ECU has 68 pins and it looks like more than 40 are used. In
> contrast the waterboxer 2.1 ECU has 25 pins, 16 used.
>
>
> Mark
>
> neil N wrote:
>
> > Thanks Mike.
> >
> > It's labelled a "power supply" relay. I understand it supplies power
> > to the ECU.
> >
> > But you've raised a good question.
> >
> > Does an ECU typically need power (from 50 connection?) to provide
> > power to ECU so it temporarily supplies grounds to relays such as the
> > fuel pump?
> >
> > I'm beginning to think that part of the problem, is that fuel pump and
> > ? is not getting power during cranking cycle.
> >
> > Neil.
> >
> > On Wed, Apr 16, 2008 at 1:45 PM, Mike S <mikes@flatsurface.com> wrote:
> >
> > > At 03:50 PM 4/16/2008, neil N wrote...
> > >
> > >
> > >
> > >
> > > > I guess the simple question is, as per the diagram, do 3/86 and 2
> > > > actually connect to the relay?
> > > >
> > > >
> > > No. The diagram is just showing the internal connections on the relay
> panel
> > > - those terminals are probably intended for use with a different vehicle
> > > and/or engine, and definitely with a different relay.
> > >
> > > Based on the small section of the diagram shown, I'd guess that is the
> load
> > > reduction relay. Terminal 30 is battery +. The ECU brings terminal 5/86a
> > > high to remove power from unnecessary components during cranking, so the
> > > starter gets more power.
> > >
> >
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