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During winter (10 to 16 degree centigrade), when driving with only AC Fan with AC Compressor off, while stopping in D, at times RPM goes below 600 and car is tending to stall with very rough idle. Thi

Toyota service center technician did road test and checked for error codes but couldn't replicate the problem. Throttle Body has been cleaned.

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Most likely u have a bad throttle positioning sensor. It's called (TPS). This sensor is how the computer knows the position of the throttle body

Posted on Dec 12, 2014

  • Biju Paul
    Biju Paul Dec 13, 2014

    Lorenzo, Thanks for the answer. Just to clarrify, this issue is not happening when AC compressor is on or both AC&Fan are off, only when Fan is on & outside is cool that too not always.Is there any way I can check/test TPS?

  • Lorenzo Dec 14, 2014

    really that has nothing to do with ur engine idle. but if it's idling rough, most likely the tps sensor. yeah u can do an ohm test and see it's responding to the throttle position

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