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Switch
Quote:
Originally Posted by Number_Cruncher
. . . The electrical detail I'm not sure about is whether these have an idle position switch as part of the sensor, or, whether the ECU learns where idle is by simply monitoring and storing the minimum TPS voltage. If there's a switch, it's easy, if the ECU uses minumum voltage, it's best to read live data. Live data being the best way to see what's going on regardless.
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Yes, there is an SPDT switch as part of the TPS. Here is the schematic.
Parrot, if you figure out how to take the TPS apart without damaging it, let me know as I'd like to take mine apart to check the switch. In my TPS, the resistance across pins 3 and 4 does not go all the way to zero when the switch closes. The minimum I read is about 200 ohms and the opening of the switch as TPS goes above idle seems to be flaky -- the resistance bounces around before going to infinity.
Possible dirty contacts? This problem may be related to my problem where the engine occasionally does not respond to the accelerator pedal at very low speeds (parking lot or stop-and-go driving). Since this is an "occasional" problem, I'd rather not wreck this $500 part taking it apart.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
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Last edited by whunter; 03-19-2009 at 10:09 AM.
Reason: attached picture
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