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Old 12-22-2007, 11:11 AM   #1
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Default can i use one of these TPS

both were pulled off older (e30ish) BMWs both have only 3 wires. and if i can use them, how? i know one wire will be ground. whould the other 2 just be the 5v and signal from MS? is the 5v actually a power source for a TPS or is it a 5v from the TPS to MS?

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Old 12-22-2007, 11:26 AM   #2
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A variable TPS is just a potentiometer. One line is ground, one is +5v from the MS, one is the "sweep" which sends the TPS value back to the MS. You can figure out which wire is which fairly easily using a digital multi-meter.

-Mike
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Old 12-22-2007, 10:56 PM   #3
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Those look like switch-type TPS. The BMW sensor that has been used successfully in the past is a 6-wire potentiometer-type TPS. It came on automatics, and is a round plug.
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Old 12-22-2007, 10:59 PM   #4
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i will try the junkyard again for the 6 wire unit. the big one was just a switch type. the small one works, but it works backwards.
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Old 12-23-2007, 12:33 AM   #5
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Quote:
Originally Posted by bryantaylor View Post
the small one works, but it works backwards.
Then reverse the relative positions of GND and Vref. Potentiometers don't have a defined "backwards" and "forwards"- it's all up to how you connect 'em.
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