The PCM computer also drives Mercury Racing’s exclusive Engine Guardian System. Engine Guardian monitors engine functions and indicates when parameters go out of specified range, minimizing the risk of engine damage. This “smart” technology not only detects and alerts the boater of a problem, but it also processes the data and reduces power to a maximum, safe level that allows the boater to continue operation. Engine Guardian also has the ability to proactively help prevent engine overheating by sensing not only engine temperature, but exhaust coolant temperature as well. By sensing engine coolant and exhaust coolant temperatures, the system can take action in advance by reducing engine power before temperature related engine damage occurs.