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The 2001 Toyota Corolla's ECU can be found under the center storage box, behind the ashtray and 12V power outlet. The ECU is a computer system that relies on a network of sensors to monitor various functions of the engine, such as fuel economy, emissions, and fuel injection. One critical role of the engine control unit is to precisely time the spark that ignites the fuel and oxygen mixture in the engine. If the timing is off, it can lead to severe engine misfires. If you experience intermittent engine stalls when starting the car or idling at red lights, it could indicate a faulty ECU.
The computer for the 2001 Toyota Corolla is found in two spots. The primary location is behind the dashboard on the passenger side, below the airbags. You can also locate the body computer under the driver side airbag, next to the fuse box.