The ECU or PCM or engine computer (whatever you want to call it) location varies from year to year.
For most first and second gen cars, the ECU is located either beneath the driver's seat, underneath the dash on the passenger's side, or in the glove box.
For third gen cars 95-02, the ECU is located in the passenger side fender, in the bumper. For some 02's and all 03-05 cars, the ECU is bolted to the passenger side strut tower, in the engine bay.
