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'93 940 Rex-Regina - Gradual Rise to Too-high Idle 900

posted by  spook on  Fri Dec 6 19:44 CST 2019
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last visit: Fri Oct 24 08:06 CST 2014
[RELATED]

Dear Art Benstein,

Hope you're well. Thank you, for your guidance. Am I correct to infer that a failed Throttle Position Switch (TPS) - by not providing a ground to the Engine Control Unit (ECU) - misleads the ECU to conclude that the throttle is closed, so causing the ECU to direct the IACV to open?

Can I use a Digital Volt-Ohm-Multimeter to see if the TPS works? If so, should I see 12 volts at pin 2, when the engine idles? If there's no voltage at Pin 2 during idle, should I conclude the TPS has failed?

This problem arose suddenly a few months ago, i.e., there were not periods of normal idle followed by intervals of high idle.

The factory-original TPS (I have car's records from new) does not owe me a penny.

May I replace a VDO TPS with a Bosch unit?

Thanks again for your help!

Yours faithfully,

Spook






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