Date: Tue, 17 Jul 2007 14:08:20 -0700
Reply-To: David Kao <dtkao0205@YAHOO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: David Kao <dtkao0205@YAHOO.COM>
Subject: Re: ECU and starting question
In-Reply-To: <402006.42972.qm@web35602.mail.mud.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
David, I am not trying to race to answer your question. But I can't help it.
I just looked at my Bentley manual at the electrical diagram. There are
two wires and one relay you want to check.
The relay is naturally the fuel pump relay. Why two wires? one is supplying
power to the relay and the other supplies power to the switch controlled
by the relay. This switch if activated will power the pump. So if the pump
doesn't pump, either the relay is not getting the power or the switch controlled
by the relay is not getting power. These two wires are not connected together.
Each has its own connection to somewhere else.
The wire that feeds power to the switch in the relay is directly connected to
the battery. It is always hot as long as the battery is connected. This is
shown on the diagram. This makes sense as you don't want fuel to be cut off
anytime you are driving.
The wire that feeds power to the relay (which activates or deactivates the switch)
is coming from the pin #4 of the transistor ignition control module. This pin
also has a wire that connects itself to the ignition coil's terminal #15. On the
diagram the wire that feeds the switch in the relay comes from this #15 terminal
(instead of #4 on the ignition module). But they should be connected together
on the #15 terminal of the coil. The coil's #1 terminal also has another wire that
goes to the #1 pin of the ignition module.
It looks like you may have a loose connection on the #15 terminal of the coil,
or you have a loose connection on pin #4 on the ignition module. It's not ECU.
But there are wires connecting the ECU and the ignition module. Still it's not
likely to be an ECU problem.
If you have a Bentley manual this is on the diagram. Well, I am talking about
wasserboxer 1.9 engine. If you have a 2.1 it may be or many not be the same.
If you have a subi... Oops, forget it. Don't mean to go there. Pardon me. No humor
intended. Ask Benny if it is a subi.
Hope this helps.
David
--- most david <dmost@YAHOO.COM> wrote:
> I still haven't figured out why the fuel pump gets power intermittently when turning the
> ignition key. For those of you that didn't read my posts from the last couple of weeks, I've
> checked the relays, replaced the ignition switch, and tested for power at the fuel pump. When
> the fuel pump gets power, the engine starts every time and runs well.
>
> A local mechanic is convinced that the ECU is causing the problem based on my characterization
> of the problem. I asked a second mechanic about this, and he didn't think that this was likely.
> I then told the second mechanic that I'm able to start the engine by pushing the van and
> popping the clutch (on those rare occassions when turning the key on and off a number a of times
> doesn't result in my hearing the fuel pump come on). Upon hearing this, the second mechanic
> said that he's certain that the ECU isn't causing my problem.
>
> So, if I can start the engine by popping the clutch, does this definitely mean that the ECU is
> not the source of my intermittent power at the fuel pump upon turning the key to the second (not
> start) position?
>
> Thanks for the help,
> David
>
>
>
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