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Join Date: Oct 2004
Location: Atlanta, GA
Posts: 75
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All -- need some help identifying what this thing is and what does it do ?! (see photos below). It's front/center on my 3.2, and appears to be a small cylindrical female electronic plug fitting of some type. It has a black rubber plug (taken out on the second photo and sitting just above on top of the idle regulator).
As always, you help is appreciated. Thanks, Dan ![]() ![]()
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Dan '87 911 Carrera - Cabriolet |
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Join Date: May 2002
Location: St Louis
Posts: 4,211
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The schematic says it is a "connection for test instrument"
Pin A goes to pin 12 of the DME. Pin B to the "throttle valve switch" Pin C is ground. Pin 12 of the DME COULD be a serial stream going out but I don't what it would contain or how it is used. Edit: I am sure with all the DME experts here if there was any usable info on the line to the test connector Pin A that goes to Pin 12 of the DME and the serial TXD pin of the 8051 we would know about it. Last edited by rick-l; 01-30-2006 at 07:55 AM.. |
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Join Date: Oct 2001
Location: San Carlos, CA US
Posts: 5,529
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I used to know this, but my DME memory is bad now that I drive a CIS. I believe it is a connector that disables the DME compensating function while the idle mixture is adjusted at the factory. Once it is set, there is not much to do with that connector.
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Porsche 2005 GT3, 2006 997S with bore-scoring Exotic: Ferrari F360F1 TDF, Ferrari 328 GTS Disposable Car: BMW 530xiT, 2008 Mini Cooper S Two-wheel art: Ducati 907IE, Ducati 851 |
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It's the TDC (Top Dead Center) test connection point. It's only use is diagnostic - it has nothing to do with the function of the engine.
Mike
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Mike 1976 Euro 911 3.2 w/10.3 compression & SSIs 22/29 torsions, 22/22 adjustable sways, Carrera brakes |
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Irrationally exuberant
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It goes to an unused flywheel TDC sensor. It is not connected to the DME in any way. Supposedly it is for testing but I am not aware of a test regime that uses it. Just to be sure I just checked the factory "DME Test Plan" (WKD 490 921)and I didn't find it used anywhere.
-Chris
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ |
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Registered
Join Date: Oct 2004
Location: Atlanta, GA
Posts: 75
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Thanks gentlemen -- I knew this group would know exactly what it was !
Regards, Dan
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Dan '87 911 Carrera - Cabriolet |
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