Were is Engine Control Module for Mazda 626?

The Engine Control Module (ECM) for a Mazda 626 can be found in the engine bay, near the firewall. It is usually located on the passenger side of the engine bay, near the battery. The ECM is a small, rectangular box with several electrical connectors attached to it. It is responsible for controlling the engine's functions, such as fuel injection, ignition timing, and emissions control.