What does a thermactor air pump fuse control?

The thermactor air pump fuse controls the electrical supply to the thermactor air pump, which is part of a vehicle's emissions control system. This pump introduces fresh air into the exhaust stream to help reduce harmful emissions during cold starts. If the fuse blows, the pump will not operate, potentially leading to increased emissions and failing an emissions test. It's crucial for maintaining compliance with environmental regulations and ensuring optimal engine performance.