Air Injection: Description and Operation

Purpose
The secondary air injection helps to clean the exhaust gas by introducing fresh air into the exhaust port or three-way catalyst in relation to varying driving conditions.

Operation
The powertrain control module engine (PCME) controls secondary air by actuating the solenoid valves (secondary air switching, secondary air bypass, relief 2, port air bypass, split air bypass) and the air pump relay.

Construction
This system consist of an air control valve (ACV), three way solenoid valves, air pump relay and powertrain control module engine.