Toyota Corolla (E120): Circuit description

Wiring diagram

Wiring diagram

Inspection procedure

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    Oxygen sensor monitor (front and rear o2s system)
    Preconditions The monitor will not run unless: mil is off  drive pattern  connect the obd ii scan tool to the dlc3 to check monitor status and preconditions.  Start the engine and allow it to idle for 2 minutes or more.  Drive the vehicle at 25 mph ...

    For vehicles equipped with catalytic converter
    Caution: if large amount of unburned fuel flows into the converter, it may cause overheating and a fire hazard. To prevent this, observe the following precautions. Use only unleaded gasoline.  avoid prolonged idling. Avoid running the engine at idle speed for more than 20 minutes. ...

    If your vehicle overheats
    The following may indicate that your vehicle is overheating. The engine coolant temperature gauge is in the red zone or a loss of engine power is experienced. (For example, the vehicle speed does not increase.) "Engine Coolant Temp High Stop in a Safe Place See Owner's Manual" is shown on ...