Air Injection Valve (AIV)
To test system, see AIR INJECTION VALVE Flow chart. To test AIV, apply vacuum to AIV diaphragm. See Fig 1 . Apply light air pressure to air cleaner side of AIV. Air should flow toward exhaust manifold side. Air should NOT flow in opposite direction.
NOTE:
On some air injection valve control solenoids, port "C" may be a vent that is capped with a filter. Also, if solenoid does not respond as specified, perform test again, considering port "A" as port "B" and vice versa.