Anybody have a spare TPS and a DMM handy? - Fuelly Forums

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Old 02-06-2007, 07:05 AM   #1
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Anybody have a spare TPS and a DMM handy?

Thinking about the ForkenSwift last night, had a brainwave:

Is a TPS just a potentiometer? Anyone know what the ohm rating is?

Seems like its range of motion is going to roughly match what I need for the ForkenSwift's potbox. (I did hack a potentiometer solution using gears, but I'm thinking ahead to replacement of that hack should it break/wear out).
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Old 02-06-2007, 07:56 AM   #2
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I actually have 3 spare honda TPS sensors and DMM handy. I'm not an electrical guru, so you might have to walk me through what you're looking for.
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Old 02-06-2007, 08:05 AM   #3
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How many electrical connectors/tabs/pins are there on the TPS?

I'd be looking for the range of ohms between 2 tabs as the actuator is rotated.

Try setting the DMM ohms range to "20k", hold to 2 TPS tabs and rotate the actuator. (You may have to try different pairs of tabs until you get a reading.)

I'm just curious what the ohm range is from "idle" to "wot".
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Old 02-06-2007, 08:42 AM   #4
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I know for Hondas the voltage at idle is .45V (and below) and WOT is 4.5V+
The TPS has three wires: Ground, +5V and output (anywhere from .45V to 4.5V)
to measure the Ohms: The signal wire is the middle one so one lead there and Pin 3 is the +5V feed (pin 3 should be the one furthest right when the locking tab on the TPS is straight up) just measure resistance at no throttle and full throttle to get the Ohms reading.
Disclaimer:
Some of this is going off of memory WOT = very close to no resistance and closed throttle should be around 450 Ohms

Hope some of this helps.
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Old 02-06-2007, 09:15 AM   #5
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Thanks Tom. Sure it's not 4500 ohms? I could use it if it's 4500
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Old 02-06-2007, 10:10 AM   #6
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not absolutely sure. I just used a formula to drop 4.5V down to .45V at 1mA and got 450, but it might be 4500 Ohms though. We'll have to wait and see what Matt says.
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