Car shuts off when A/C turned on... - Toyota Yaris Forums

YarisSedan · 06-08-2013, 08:24 PM

The computer has adaptive learning and can correct a lean or rich condition by adding or subtracting up to 30 percent fuel once its long term memory cant correct past that point it sets the check engine light. Depending on the scanner you are using simply resetting the check engine light may not reset the adaptive memory. A easy way to completely wipe the memory is disconnect both the negative and positive battery terminals from the battery and touch them together for 10 seconds and then reconnect them to the battery. This will discharge the capacitors in the ecu and completely whipe its memory back to zero.

Simply doing that you will be surprised how much different the car will run,

http://www.tooltopia.com/equus-3100.aspx

This is a real good diagnostic tool for the price It lets you look at all live data which includes fuel trim and 02 sensors as well as freeze frame data when your check engine light was triggered.

If the scanner you have lets you look at o2 voltage i would see if it is switching properly or is still indicating lean. If you watch your o2 voltage disconect a small vacuum line and spray a bit of brake clean or carb clean in the intake you should be able to watch your o2 signal spike rich.

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06-08-2013, 08:24 PM	#10
YarisSedan Drives: 08 Yaris Sedan Join Date: Oct 2008 Location: California - Bay Area Posts: 2,773	The computer has adaptive learning and can correct a lean or rich condition by adding or subtracting up to 30 percent fuel once its long term memory cant correct past that point it sets the check engine light. Depending on the scanner you are using simply resetting the check engine light may not reset the adaptive memory. A easy way to completely wipe the memory is disconnect both the negative and positive battery terminals from the battery and touch them together for 10 seconds and then reconnect them to the battery. This will discharge the capacitors in the ecu and completely whipe its memory back to zero. Simply doing that you will be surprised how much different the car will run, http://www.tooltopia.com/equus-3100.aspx This is a real good diagnostic tool for the price It lets you look at all live data which includes fuel trim and 02 sensors as well as freeze frame data when your check engine light was triggered. If the scanner you have lets you look at o2 voltage i would see if it is switching properly or is still indicating lean. If you watch your o2 voltage disconect a small vacuum line and spray a bit of brake clean or carb clean in the intake you should be able to watch your o2 signal spike rich.