Toyota Corolla (E120): Circuit description

This is the power source of the ecu, hence the actuators.

Wiring diagram

Wiring diagram

Inspection procedure

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    Identification information
    Vehicle identification and serial numbers 1. Vehicle identification number The vehicle identification number is stamped on the vehicle identification number plate and certification label, as shown in the illustration. Vehicle identification number plate certification label 2. Engine ...

    Catalyst monitor (o2s type)
    Preconditions The monitor will not run unless: mil is off. Engine coolant temperature (ect) is 176°f (80 °C) or greater. Intake air temperature (iat) is 14°f (–10 °C) or greater.* Notice: * 2002 and later my vehicles: the readiness test can be completed in cold ambient c ...

    Have the malfunction repaired immediately. (vehicles with a smart key system)
    After taking the specified steps to correct the suspected problem, check that the warning message and light go off. ■Warning buzzer ...