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Join Date: Jun 2009
Posts: 745
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what does the "sensor "on the side of the TB do
Hi got what looks like a sensor on the side of the TB . what does this do?Thanks
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09-15-2009, 06:25 PM
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Drive it like u stole it.
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Sounds like a Throttle Position Sensor to me. Do you have a picture to be sure? It basically tels the ECU what the position of the throttle is (hence the name:-).
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____________________________ Bill Jones Jupiter, FL 77 Euro 911 3.0 Wide Body - under construction http://www.flickr.com/photos/rennsport/collections/72157618856489537/ |
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09-15-2009, 06:28 PM
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Posts: 745
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here it is
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09-15-2009, 06:50 PM
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Drive it like u stole it.
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That is a TPS fo sure.
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____________________________ Bill Jones Jupiter, FL 77 Euro 911 3.0 Wide Body - under construction http://www.flickr.com/photos/rennsport/collections/72157618856489537/ |
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09-16-2009, 05:03 AM
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sudo apt-get purge 930
Join Date: Jul 2006
Location: Brandon, FL
Posts: 4,838
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Why is there a TPS on CIS?
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL*** "Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing" --clutch-monkey |
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09-16-2009, 07:58 AM
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that was my next question?
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09-16-2009, 08:06 AM
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,249
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It tells the lambda ecu or k-jetronic box under the driver seat the position of the throttle butterfly and sets the base duty cycle of the frequency valve relative to the position of the throttle butterfly after the temperature sensor in the passenger side timing cover decides the engine has warmed up enough.
The oxygen sensor's output then tells the ecu the O2 level in the exhaust and the the ecu adjusts the frequency valve up or down to fine tune AFR for lower exhaust emissions. |
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09-16-2009, 08:25 AM
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Drive it like u stole it.
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What year-model is the car? If I have time I will look it up on the PET.
JFairman, excellent explanation. Bill
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____________________________ Bill Jones Jupiter, FL 77 Euro 911 3.0 Wide Body - under construction http://www.flickr.com/photos/rennsport/collections/72157618856489537/ Last edited by jonesb930; 09-16-2009 at 09:00 AM.. |
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09-16-2009, 08:48 AM
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,249
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You can see the fitting and fuel line going to the frequency valve on the silver USA fuel head in the picture he included so that is what the throttle position switch is doing on this car.
It's the small one to the right of the large rubber fuel inlet on far left of the fuel head and that doesn't exist on a ROW or euro fuel head from '86 and earlier so this appears to be an '86 through '89 USA motor in this picture. You also see the where the frequency valve return line piggybacks onto the return line banjo bolt along with the WUR return line on the right side of the fuel head. At or near full throttle the TP switch tells the ecu to ignore the O2 sensor output and it goes into open loop mode and the frequency valve stays at something like 70% duty cycle or something like that to richen up the fuel mixture when the turbo is making boost. The way it does this is another story... It's all here if you can find it with a search. |
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09-16-2009, 09:06 AM
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Project Car
