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 the catalyst operation.

The system includes the following components:
^ The 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, then the battery voltage is applied to the pump. The filter is the only serviceable part of the pump.
^ The 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 the engine vacuum to be applied to the AIR Shut Off Valve.
^ The AIR Shut Off Valve-The AIR Shut Off Valve is 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.
^ The check valves-The check valves prevent back flow of the exhaust gases into the secondary air injection system. An inoperative AIR pump that had shown indications of exhaust gases in the outlet port would indicate a check valve failure.
^ The plumbing -The plumbing carries the air from the pump to the exhaust stream. The plumbing includes the hoses, the pipes, and the clamps. You can test the plumbing for leaks using a soapy water solution. With the AIR pump running, the bubbles with form if a leak exists.