Purpose

The secondary Air Injection (AIR) system aids in the reduction of hydrocarbon emissions. During Open-Loop fuel control, air is injected into the exhaust stream for a specified amount of time. Heat generated from post-combustion oxidation helps the catalytic converter reach operating temperature sooner, referred to as converter light off. The following conditions determine pump operation:
^ Start-up ECT and IAT must be more than 4.4°C (40°F) but less than 30°C (86°F).
^ Start-up BARO must be more than 75 GPA.
^ The start-up conditions will operate for 70 seconds or until the vehicle reaches Closed Loop.