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Date:         Tue, 25 Mar 2003 17:11:08 -0500
Reply-To:     KGFaison@AOL.COM
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Kevin Faison <KGFaison@AOL.COM>
Subject:      Fried ECU diode...
Content-Type: text/plain; charset=iso-8859-1


Hi All,


So my ECU is blowing a zener diode on the ECU PCB.  I noticed that one end of the diode connects to PIN 1 on the ECU connector.


I am still tracing the connections on the wiring diagram in the Bently manual but it appears that pin 1 goes to the idle stabilizer as well as the ignition switch.  According to bently, pin 1 should have power when the starter is operated, which it does.  However pin 1 is shorted to ground when the ignition switch is just in the on position.  My question is should pin 1 be "open" or high impedance when the switch is on?
BTW it is the same result with the idle stabilizer removed.


I am speculating that the Zener diode is excessivly forward biased as it was burned pretty badly.


Anybody run into this problem before?


Thanks
Kevin
91 Westy with Digifant
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