Date: Fri, 28 Dec 2007 17:40:29 -0800
Reply-To: Scott Daniel - Shazam <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Shazam <scottdaniel@TURBOVANS.COM>
Subject: Re: Daily Update On My Injectors
In-Reply-To: <940075.15583.qm@web82706.mail.mud.yahoo.com>
Content-Type: text/plain; charset="US-ASCII"
Well David............mostly all pretty true.
I'm not so sure about this one though :
" With the ignition on but engine
not running all 8 injector leads should give you 12 volt reading."
There's no reason to be looking for 12 volts on the wire that comes from the
ecu to the injectors and supplies ground for the injectors. It's not logical
to look for 12 volts on that wire, it wouldn't have any purpose.
Scott
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
David Kao
Sent: Friday, December 28, 2007 5:19 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Daily Update On My Injectors
Now that you have tried so many ECUs it is indeed very unlikely all of them
are defective. You may have a wiring problem.
The Bentley shows that one of the leads of each injector are connected
together
and is fed with power from a relay called fuel pump relay. The other led of
the
injector goes into the ECU then all 4 of them are combined into one and
connected
to the solid state switch in the ECU. If the switch is turned on (shorts the
4 leads to ground) the injectors will spray fuel. So with the ignition
switch
turned off none of the injector leads is grounded. With the ignition on but
engine
not running all 8 injector leads should give you 12 volt reading.
Pin 7 of the ECU is ground for ECU. It has nothing to do with the injectors.
When you turn on the ignition key did you hear the fuel pump humming for a
few
seconds? That's the fuel pump pumping up the fuel pressure. If you did not
hear
the hum you may have a defective fuel pump relay. There are two relays in
the
relay box. The 2nd one is called power supply relay. If any of the two is
defective
you have not hear the fuel pump humming. You will not be able to start the
engine.
Good luck.
David
--- Vdub Guy <fonman4277@COMCAST.NET> wrote:
> OK, <sigh>, today I obtained not one but 2 used ECU's, 6 used injectors,
and while I was at it
> got the entire wiring harness out of a 1.9 Vanagon. Both ECU's give the
same result as my other
> two. Now the 2 I got today were used and unkown, but doubtful I have 4 bad
ECU's. Thanks to
> those who pointed out I was checking the fuel injectors incorrectly with
my meter. Set at 1X I
> get 15-16 ohms. Now, I started dissecting the harness I got (damn sure
less complicated than the
> mountain of wiring I have in my basement from my Suby donor!). From the
ECU plug I found
> continuity between pin 7 and brown wire with a white tracer ,which goes to
the cluster of
> grounds on the head. I assume pin 7 is ground to the ECU, as each injector
shows one side to pin
> 7 (Bentley). I did NOT get continuity from any of the injector plugs to
pin 7. So, I head out
> to the Vanagon, unplug the ECU, I get continuity from pin 7 to the head. I
also get continuity
> between one side of each injector plug and pin 7. So, I
> 'm not sure what this proves, other than I have ground to pin 7 at the
ECU, but when i check the
> FI plugs on the engine, apparently no ground with ignition on, engine
cranking-test light
> doesn't flicker. Jeff
>
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