Question about 2001 Toyota Yaris

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Low idle speed - 2001 Toyota Yaris

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The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.


Posted on Oct 24, 2012

  • Armand tirol davila Sep 14, 2013

    You won't believe this, I bought a Yaris a used 2008 Yaris a moth ago cause I find it QT! Everything is fine except for low idle speed. Since I can not find any adjustments, I went to the dealer to do the job, cleaning the trottle valve and etc! I drove it home and found out it is still the same, iddkes at 500 rpm! In my desperation I went to store and bought IRIDIUM sparkplugs for YARIS and install it my self! PRESTO! The idle speed went up to 650- 700 rpm! Hope you read this!

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