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Date:         Wed, 1 Sep 2004 18:49:31 -0700
Reply-To:     Vince S <gipsyflies@COMCAST.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Vince S <gipsyflies@COMCAST.NET>
Subject:      Re: What voltage do injectors need to fire?
Comments: To: tabe johnson <xtabe@YAHOO.COM>
In-Reply-To:  <20040901235510.1850.qmail@web40609.mail.yahoo.com>
Content-Type: text/plain; charset="us-ascii"

I am quite sure the ECU control the injectors via ground closure arrangement. That means one side of the injector is wired to 12V and the other side connected to the ECU switching transistor. Early injectors till about 78 has external current limit resistors but these are later became an integral part of the injector.

When you monitor the injector with an oscilloscope you want to look for the low time of the pulse. The low time of the pulse is when the injectors are open. This should be very close to 0 volt.

According to my book it shows the voltage is around 4V when the injector is open. I will however interpret this with a grain of salt as I think it depends which Bosch system and what year (Digifant is derived from the Bosch system specifically for VW).

- Vince

http://gipsyflies.home.comcast.net 1989 Vanagon GL Camper 1993 Mazda Miata (for sale) 1996 Land Rover Discovery 2005 Mini Cooper S

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of tabe johnson Sent: Wednesday, September 01, 2004 4:55 PM To: vanagon@GERRY.VANAGON.COM Subject: What voltage do injectors need to fire?

With the Digifant system, does anyone know what voltage the ECU sends to the injectors to get them to open? I'd need an oscilloscope to measure this and sadly I'm without.

Thanks!

--tabe johnson xtabe@yahoo.com Vancouver, BC

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