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General Category => General Discussion => Topic started by: jmac851 on June 18, 2015, 08:28:22 PM
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Does anyone know if all PF09 throttle position sensors are the same? My 1996 Cal has a PF09/04 and the Ducati dealer says they are all the same.
The resistance of mine is around 550 ohm and the resistance of the Ducati part is around 750 ohms. The vector diagram for each is different.
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Does anyone know if all PF09 throttle position sensors are the same? My 1996 Cal has a PF09/04 and the Ducati dealer says they are all the same.
The resistance of mine is around 550 ohm and the resistance of the Ducati part is around 750 ohms. The vector diagram for each is different.
I think all are the same, and doc I have is 550 ohm
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You really can't tell if it's ok just by measuring the resistance, they put out Voltage, not Ohms.
They have some other resistors in parallel, I think to create a "Get me home Voltage" in case it fails. (that's how I interpret it anyway)
Connect it up to the bike and see if it goes from zero to 5 Volts smoothly without jumping as you move it from one end to the other
I'm not sure what you mean by the "Vector diagram" but it would be possible for the 550 & 750 t0 put out the same 150 to 450 mV and the ECU wouldn't know the difference. (the mV / degree is what the ECU cares about)
BTW a couple of us were experimenting with Hall effect sensors that also put out the same Voltage without contacts to wear out.
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I have never seen a hall effect sensor with contacts. They are used for the spark and rpm sensors in my 1996 Cal. The throttle position sensor is not a hall effect sensor.
The newer throttle position sensors in some cars are the no contact type. I think you need a four conductor feed to make them work but I'm not sure. I know that they can change out the old wiper style to a non contact style on some of the old Mercedes systems but I don't know the details.
The vector diagram is used to determine the characteristics of the tps as it moves through its full sweep. If the change in voltage is linear, the line is straight up the graph. If the change is not linear, the change in voltage will go up faster or slower for the same angle of movement throughout the range.
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Take a small flat blade screw driver and pop the top of your tps. It will come apart very easily. Have a look inside. Clean and reassemble. I took mine apart after years of crappy running. Found that the tps had bent and damage contacts. I replace it with the original. The bike runs better than ever. Use the original, not a substitute. You can look all over and find lots of information that will confuse you. There are different part numbers for a reason, they perform differently. The different part number may work, but only ht oem works correctly with your bike.
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Hey there jmac, A lot of us chimed in on this about a year ago and yes there is a difference in the liniarity between the 03,04 and the harley tps. Do a search on it and you can find all kinds of info. I dont recall his name but a guy in Norway or Sweden built a whole test setup just to confirm all the differences. Happy Hunting :evil:
Paul :boozing:
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I have never seen a hall effect sensor with contacts. They are used for the spark and rpm sensors in my 1996 Cal. The throttle position sensor is not a hall effect sensor.
The newer throttle position sensors in some cars are the no contact type.
No Hall effect sensors don't have contacts, they work with magnetic fields, there are switches like in a distributor and Linear types as used for measuring current or rotary angle, I have a couple of those, these are 3 wire type made for auto use. Unfortunately these are a little too large but Digikey sell smaller ones, you need the CCW type I think.
Vectors are usually used for explaining AC Voltage, I think you are referring to a simple XY plot. I don't know why they should make non linear types, figuring out stuff is what microprocessors do best,
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I took mine apart after years of crappy running. Found that the tps had bent and damage contacts. .
I suspect it ran against the end of travel stop at sometime. This is the reason it's set to 150 mV with the throttle closed, so it's well away from the stops at both ends of travel.
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Thanks for all of the advice. It looks like I should just look for a PF09/04 or change it over to the later model pc3. I'll probably have to make a different mount but it might be worth it in the long run.
I saw a write up about the PF09s no longer being made by Weber. Now they are made by some aftermarket company and they are not as specific as the original. I'll have to check and see what Guzzi has in stock. If they are selling the aftermarket ones, I'll just buy it from Ducati. ($90).