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Date:         Tue, 25 Sep 2007 21:44:20 -0700
Reply-To:     David Kao <dtkao0205@YAHOO.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Kao <dtkao0205@YAHOO.COM>
Subject:      Re: The two throttle valve switches, redux
Comments: To: Michael Elliott <camping.elliott@GMAIL.COM>
In-Reply-To:  <46F9B52C.9020301@gmail.com>
Content-Type: text/plain; charset=iso-8859-1

--- Michael Elliott <camping.elliott@GMAIL.COM> wrote:

> Wait. I got this wrong. Lemme try again. > > On the earlier 1.9L's there are two switches on the throttle valve. One > closes when the foot is off the gas pedal, and the other closes when the > pedal is floored. They are wired in parallel and both connected through > one single wire to Pin 4 of the ECU per Bentley's 97.55. Both switches > ground Pin 4, the ECU doesn't have any way to know which switch did it. > > Now if the engine is at 1500 rpm or faster and you take your foot off the > gas, the idle switch closes, grounding ECU Pin 4. Bentley's says that > under these conditions, the ECU shuts off fuel to the injectors (24.33). > > But if you /floor/ the pedal, the full throttle enrichment switch closes, > which ALSO grounds ECU Pin 4. Bentley's tells us that when this happens > the ECU will enrich the mixture (24.34). > > So taking your foot off the gas or flooring the pedal both ground Pin 4 > ... so, uh, how does the ECU know whether to shut off the fuel or to > enrich the mixture? > > -- > Mike "Rocket J Squirrel" Elliott > 71 Type 2: the Wonderbus > 84 Westfalia: Mellow Yellow ("The Electrical Banana") > 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano > KG6RCR >

My guess is the ECU reads the signal from AFM. The signal from the AFM is probably different enough between floored and foot off.

David

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