Date:         Thu, 9 Oct 2008 13:33:48 -0700
Reply-To:     Jake Beaulieu <jake_beaulieu@YAHOO.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Jake Beaulieu <jake_beaulieu@YAHOO.COM>
Subject:      Re: Technical question re: Injector firing signal
In-Reply-To:  <743805.89209.qm@web82705.mail.mud.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1

Yes, there is definetly a white wire running from the ignition coil to the ECU.  Well, at least there is on my 1982 Federal version air cooled van.  I'm assuming the AC van we are discussing here has the California exaust and ignition?
Another component that interacts with the injectors is the extra resistor pack mounted on the chassis.  I am not sure the California vans have this, but the Federal does.  I believe the injectors on the water cooled vans are built with a different internal resistance so this "resistor pack" was eliminated.  I might be getting the term wrong, but I am sure Ratwell explains it correctly.  www.ratwell.com  The Bentley does describe how to test this thing.


--- On Thu, 10/9/08, David Kao <dtkao0205@YAHOO.COM> wrote:

From: David Kao <dtkao0205@YAHOO.COM>
Subject: Re: Technical question re: Injector firing signal
To: vanagon@GERRY.VANAGON.COM
Date: Thursday, October 9, 2008, 12:55 PM

My Bentley manual shows that ECU pin #1 gets the signal from
the coil. This signal from one of the terminals on the coil
is actually connected to the pin #1 of the ignition control
unit. I think Scott was referring to the wire between the
terminal on the ignition coil and pin #1 of the ECU. If this
wire is disconnected you will still get sparks but the ECU will
not get the signal to fire the injectors. Scott probably has
this kept in his brain. I have to look at the schematics to
see this. That's a significant difference between an expert
and a novice. I think ECU is normally very durable. It is the
wiring that is more likely the cause of the problem.

David


--- On Thu, 10/9/08, B.J.R. <beer_eighty@yahoo.com> wrote:

> From: B.J.R. <beer_eighty@yahoo.com>
> Subject: Re: Technical question re: Injector firing signal
> To: dtkao0205@yahoo.com, vanagon@GERRY.VANAGON.COM
> Date: Thursday, October 9, 2008, 8:14 AM
> thanks David.
> But that is exactly what I ve outlined in my original post
> I built my own Double relay, that part of the system has
> been tested and functions properly.
>
> The ONLY thing I dont have is a signal to complete the
> injector loop from the ECU, I have 12v to the injectors.
>
> So in an AIRCOOLED engine, where does the computer get the
> signal to give the injectors the signal???& how do I
> test it???
>
> If Im getting spark to all my cylinders, then the hall
> distributor (AKA ignition control unit) is functioning
> properly. yes or no??
>
> where does the ignition interface with the ECU???
>
>
>
> ----- Original Message ----
> From: David Kao <dtkao0205@yahoo.com>
> To: vanagon@GERRY.VANAGON.COM; B.J.R.
> <beer_eighty@YAHOO.COM>
> Sent: Wednesday, October 8, 2008 2:36:36 PM
> Subject: Re: Technical question re: Injector firing signal
>
> You may want to check the two relays that are often the
> cause of
> this kind of problem, i.e. no signal to injectors. One of
> them
> is called fuel pump relay and the other power control
> relay.
> Do not swap the two with each other. Any of the two being
> defective
> can result in a same symptom. So you will want to find a
> new one
> then try to replace one at a time to identify the bad one.
>
> One of the two injector leads is supplied with +12v and the
> other
> will be grounded by the ECU when the ECU fires the
> injector. If
> the ECU is defective it may not be sending the signal to
> ground the
> 2nd wire of the injector. If you get sparks that means the
> Hall Effect
> Unit is working in sending the signal to the ECU. If the
> ECU is not
> defective then the two relays are more likely to be faulty
> (one of
> them).
>
> This was discussed many times before. Maybe this is why no
> one
> jumped out to point this out. Good luck.
>
> David
>
>
> --- On Wed, 10/8/08, B.J.R. <beer_eighty@YAHOO.COM>
> wrote:
>
> > From: B.J.R. <beer_eighty@YAHOO.COM>
> > Subject: Re: Technical question re: Injector firing
> signal
> > To: vanagon@GERRY.VANAGON.COM
> > Date: Wednesday, October 8, 2008, 11:04 AM
> > I do not know.
> >
> > Could you be more specific?   IE: how do I test?
> >
> > Only wire I see directly to the ECU in the wiring
> diagram
> > is terminal #1 at the ECU.
> >
> > AND
> >
> > if there is no signal, does that mean bad Distributer
> or
> > bad signal generator (hall distributor)??
> >
> > Does it matter, because i believe ONLY entire rebuilt
> > distributrors are available, not rebuild kits.
> >
> >
> > ----- Original Message ----
> > From: Eric Ley <eric_ley@hotmail.com>
> > To: B.J.R. <beer_eighty@YAHOO.COM>
> > Sent: Wednesday, October 8, 2008 9:45:22 AM
> > Subject: Re:      Technical question re: Injector
> firing
> > signal
> >
> > do you have signal for the distrubitor ??? need to tel
> the
> > computer when to
> > send signal to the injectors
> >
> >
> > --\