05 yaris 1.3
The problem could be in the PowerTrain Control Module malfunctioning or with the coil pack.
If your car has the coil on plug pack or the coil near plug pack, testing/troubleshooting is the same.
If your car is a European manufactured model, you'll need EOBD fault reader; If is American manufactured auto, an OBD-II fault reader will be needed.
In any event, with any auto / DIY project, it always helps to obtain either a hard-copy or digital version of your car's repair manual.
There is a YouTube link I am providing that will give you a brief tutorial what coils are and how to troubleshoot them...it is not vehicle year, make, and model specific- but it will help understand what coils are; how to troubleshoot them, etc.
Best wishes on your project.
Autolite Coil on Plug Ignition troubleshooting
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