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[Vous devez être inscrit et connecté pour voir ce lien]Throttle Position Sensor (TPS)
Located on the left side at the end of the throttle body. This is two inter connected potentiometers.
Measure the resistance from 31 to 25. BMW say it measures between 500 and 1000 ohms, I get about 700ohms.
Measure the resistance from 31 to 13. BMW say it measures between 600 and 2400 ohms. Measure the resistance from 31 to 10. BMW say it measures between 600 and 2400 ohms.
Throttle Resistance Resistance
Position From 31 to 13 From 31 to 10
Idle 995 880
1/4 1610 1286
1/2 1594 1586
3/4 1579 1883
Full 1580 1742
The TPS internals, at idle. The TPS internals, at full throttle.
The photos show the internals of the TPS. They show that the slider consist of 4 contacts, the upper pair are connected together, as are the lower pair. The four tracks (the black carbon semi circles) are inter connected off to the TPS connectors. I measured the following values inside the TPS. The horizontal track under the 071 is about 870 ohms. The top arc is about 10 ohms, the next one 800, the next 1000 and 20 ohms the lower track. Pin 2 of the TPS connects to the left hand side of the middle 2 tracks by a 70 ohm resistance. Pin 3 of the TPS connects to the middle of the bottom track by a 400 ohm resistance.
My comment: I think this unit has been constructed to ease the computations of the motronic unit in determining the fuels to inject and the ignition advance. I think a simple sensor would be worth the added computational complexity! the simpler sensor would be easier to test, cheaper and easier to replace and easier carry as a spare or obtain a replacement.