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Home >> Chevrolet >> 1985 >> Astro Van M V6-262 4.3L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Scan Tool Testing and Procedures >> Positions >> Air Control Switch (on/Off)
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Air Control Switch (on/Off)


Displays status of ECM signals to air cleaner divert and air switching solenoids. With air cleaner divert signal in off condition, air pump output should be routed to atmosphere. In the on position, air pump output should be routed to the air switching solenoid. When the air divert solenoid is on and the air switching solenoid is on, air should be delivered to the exhaust ports. When the divert solenoid is on and the switching solenoid is off, air should be delivered to the catalytic converter.