To be certain, you should:
* Consult your owner's manual: This is the best resource for the exact location in your specific car.
* Look for a large, black box with numerous connectors: The PCM is usually a fairly sizable unit.
* Use a repair manual: A repair manual for your year and model will provide detailed diagrams and information.
Remember to be careful when working near the engine and electrical components. Disconnect the negative battery terminal before attempting any work on the PCM.