Where is the injector circuit on a 2007 Toyota Yaris?

Question

I have the PO201 error code which appears randomly every 30Km to 50 Km. The issue sounds possible as the car ran 2000Km with a damaged spark in cylinder 1 before repair.

However, they are no circuits plugged on injectors. They are connected directly to a set of wire. The ʟᴘɢ engine speed varies between 600 to 900 rpm every second and little less when on gasoline.
There is a small box with many pluggable electronics components near the left headlamps, but if it’s inside I’ve no idea each thing belongs to:
From what I read (if I’m not wrong) this seems to be an amplifier for giving enough current to actually command the injector from the weak signal coming from the ᴇᴄᴜ.

juhist · Answer

The injector circuit is simply said the whole system that controls the injector, including the injector itself, quoting from https://www.obd-codes.com/p0201:

P0201 means that the PCM detected a fault in the injector or the wiring to the injector.

It means the injector system anywhere from the ECU to the injector is faulty. It could be the wiring. It could be the amplifier. It could actually be the ECU. It could also be the injector.

I would say if the cylinder 1 had issues in the past life of the vehicle, it's more likely that the component near the issues (i.e. the injector) is faulty than the component far away from the injectors (let's say the wiring, amplifier or ECU) is faulty.

You could try switching the injector from cylinder 1 to some other cylinder, so that it uses the wiring and position of another cylinder. Then you'll see whether the problem code changes to the other cylinder.

Where is the injector circuit on a 2007 Toyota Yaris?

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