What is the function of the secondary air pump?
2 Answers
The following is an introduction to the function of the secondary air pump: It draws fresh air into the air pump and then injects it into the exhaust system. The fresh air entering the exhaust system accelerates the catalytic reaction of the three-way catalytic converter, converting carbon monoxide and hydrocarbons in the exhaust gas into carbon dioxide and water, thereby serving an environmental protection function. It operates for a maximum of five minutes; it helps the three-way catalytic converter reach its working temperature sooner, reducing harmful substances in the exhaust gas and serving an environmental protection function. The working principle of the secondary air pump: When the engine is running, the air pump is driven by the crankshaft belt, pumping a large volume of low-pressure air flow through a hose into the diverter valve. Under normal conditions, the valve on the diverter valve opens, and the air flows through the diverter valve and check valve into the air injection manifold.
As a seasoned driver with years of experience, I'm quite familiar with this. The secondary air pump's main function is to pump fresh air into the exhaust system during cold starts, helping the catalytic converter heat up faster to burn off unburned exhaust gases and reduce tailpipe emissions. I remember one time when the pump failed while driving—the engine roared like a tractor, the emissions light came on, and I failed the smog test. The repair shop later explained that this component is crucial for environmental protection, especially in older vehicle models. During routine maintenance, I always make sure to check that the pump's intake hose isn't clogged with dust, as that can cause short circuits and burnout. Overall, it's a clever design that makes vehicles cleaner.
