General Information

The secondary Air Injection (AIR) system helps reduce exhaust emissions. The system forces fresh filtered air into the exhaust stream in order to accelerate catalyst operation.

The system includes the following:
^ AIR pump - The AIR pump supplies filtered air through the secondary air injection system into the exhaust stream. The control module provides ground for the pump relay, battery voltage is then applied to the pump.
^ AIR vacuum control solenoid - The AIR vacuum control solenoid controls the AIR shut-off valve. When the secondary air injection system is enabled, the control module provides a ground to the solenoid. Enabling the solenoid allows engine vacuum to be applied to the AIR shut-off valve.
^ AIR shut-off valve - The AIR shut-off valves are vacuum operated. When the secondary air injection system is enabled, vacuum is applied to the valve. The vacuum opens the valve and allows air from the AIR pump to flow to the check valves.
^ Check valves - The check valves prevent back flow of exhaust gases into the secondary air injection system. An AIR pump that had become inoperative and had shown indications of having exhaust gases in the outlet point would indicate check valve failure.
^ The plumbing - The plumbing carries the air from the pump to the exhaust stream. The plumbing includes the hoses, pipes and clamps. The plumbing can be tested for leaks using a soapy water solution. With the AIR pump running, bubbles with form if a leak exists.