General Description

The Secondary Air Injection (AIR) system helps reduce Hydrocarbon (HC), Carbon Monoxide (CO), and Oxides of Nitrogen (NOx) exhaust emissions. It also heats up the 3-way catalytic converters quickly on engine start-up so conversion of exhaust gases can occur sooner.

The system includes the following:
^ AIR pump - The AIR pump is mounted to the lower left front of the engine Compartment and supplies the air to the AIR system. The electric air pump pressurizes fresh air and pumps it to the AIR Shut Off Valve. The AIR pump is controlled by the PCM. Battery voltage to the AIR pump is controlled by the AIR pump relay. When the PCM provides a ground circuit for the secondary AIR pump relay, battery voltage is allowed to power up the AIR pump.
^ AIR Solenoid Valve - The AIR Solenoid Valve is located at the left rear of the intake manifold. The AIR Solenoid Valve is controlled by the PCM. The AIR Solenoid Valve controls the engine vacuum to the AIR Shut Off Valve. The PCM provides a ground circuit for the AIR Solenoid Valve, which allows engine vacuum to be applied to the AIR Shut Off Valve.
^ AIR Shut Off Valve - The AIR Shut Off Valve is mounted to the rear of the left cylinder head. The AIR Shut Off Valve controls the air flow from the AIR pump to the check valves. The PCM enables the AIR Solenoid Valve, which applies engine vacuum to the AIR Shut Off Valve. The applied engine vacuum opens the AIR Shut Off Valve and allows air supplied by the AIR Pump to flow to the check valves.
^ Check valves - The check valves prevent back flow of exhaust gases into the AIR system in the event of an exhaust backfire.
^ Necessary plumbing.
- Hoses
- Pipes
- Clamps