Date:         Mon, 6 Jan 2003 15:13:44 -0500
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Second Request for Help - Throttle Valve Switch
Comments: To: Dave Baker <DBAKER5@KC.RR.COM>
In-Reply-To:  <001101c2b5ba$51e98c40$03fea8c0@kc.rr.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 02:32 PM 1/6/2003, Dave Baker wrote:
>I'm still hoping someone out there can help me understand how I smoked the
>wires on my throttle valve idle switch circuit by shorting together the pins
>on that plug.

The +5 signal wire must have been shorted to another wire with (undoubtedly
+12v) serious current supply.  FI supply wire maybe?


>The plug I'm referring to is the one that plugs into the throttle valve
>switch connector which is mounted on top of the right side of the engine,
>fastened to the bracket that holds the metal coolant pipe which runs
>transversly across the top of the engine.

Sounds right (my '84 has the double-switch arrangement).


>According to my understanding, the throttle valve idle switch does nothing
>more than close a set of contacts when the throttle is at idle.  This would,
>in effect, put a short across those wires, just as I did when I jumpered the
>plug.

Correct.  All it should do is ground the +5 signal line to the
ECU.  Obviously that line has found a more potent source...

Not to be gloomy, but it's possible that the +12 has fried the input
circuit in the ECU...dunno what overvoltage tolerance it has.

david


>TIA.
>
>Dave in KC
>85 Westy

--
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"