Throttle Position Sensor - how to calibrate?

[bmw335isturbo]

hey I willl be heading home this weekend give me a call we can pull the one off my car and see if its the problem.

[Kvasi]

After talking with Brody from Miller about how my engine is down on power, he suggested checking the TPS for proper function. He mentioned that M1.3 cars have 3 wires, and that at WOT there should be continuity between the brown/black and ground. I checked mine and it seems like that's what I've got:


brown-blue to ground has continuity at closed throttle
brown-black to ground has continuity at WOT
Between wires has continuity at closed throttle, ~18K ohms at partial and 115 ohms at WOT

I know there's a audible "click" that can be heard from the TPC near the closed position, but I'm not sure if it should click just as I open the throttle, or should it happen somewhere else?

Does this seem right? The e34 Bentley has good info on page 130-8 and I think it all checks out.

[CorvallisBMW]

hey I willl be heading home this weekend give me a call we can pull the one off my car and see if its the problem.

I'll be in Tacoma this weekend... but I think we're hitting a junk yard so I'll pull a few there to have as spares.

unplug the TPS and turn on the ignition. see if you're getting 5v at the connector.

OK, did some more tests with voltage tonight:

Across pins 2-3: 0V at WOT, 11.3V at Idle
Across pins 2-18: 0V idle, 11.3V at WOT
Across pins 3-18: 11.3V idle, 11.3V WOT

This was done with the connector attached to the TPS and me probing the harness where it enters the back of the plug... and now that I've re-read your question it sounds like I did that wrong. I'll have to check it again this weekend when I get a chance.