Seconady air injection (AIR) system and diverter valve description and operation.
This calve is used on chevy trailblazer, gmc envoy, oldsmobile bravada 4200 engine.
Electrical connector
Electrical connector
Mounting bolts
Output air hose
The AIR diverter valve has an electronic solenoid mounted on the valve. The resistance of the
solenoid is 4-7 ohms and the current draw is 2-3.5 amps. The solenoid opens the shut-off valve
when battery voltage is applied to the valve. Once opened, pressurized air from the AIR pump
flows past the check valve and is directed into the bank 1 exhaust manifold through an outlet
pipe. The shut-off valve prevents fresh air from being drawn into the exhaust manifold by
providing a positive seal when the AIR system is inactive. The solenoid, valve, and outlet pipe
are serviced as an assembly.

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4.2L Air Injection Diverter Valve Pictures