AIR Diverter Valve. The secondary air injection diverter (AIR diverter) valve (Figure 123) is used with the electric AIR pump to provide on/off control of air to the exhaust manifold and catalytic converter.When the electric AIR pump is on and vacuum is supplied to the AIR diverter valve, air passes the integral check valve disk.hen the electric AIR pump is off, and vacuum is removed from the AIR diverter valve, the integral check valve disk is held on the seat and stops air from being drawn into the exhaust system and prevents the back flow of the exhaust into the Secondary Air Injection System. Solid State Relay.