K 2500 Truck 4WD V6-262 4.3L VIN Z (1992)
Air Injection Control Valve: Description and Operation
Wiring Diagram For Chart C-6C - Air Management Check
NOTE: Because different models and engine applications vary in wire colors, circuit numbers, and pin numbers, the above image is a typical example.
Refer to Computers and Control Systems/Diagrams/Electrical for specific schematic applications.
OPERATION:
The Electronic Air Control (EAC) valve is a high air flow valve, which is equipped with an electric solenoid to combine electronic control with normal
vacuum diverter valve function. With the ignition "ON" the solenoid is energized through the control module, and the air control valve directs air to the
exhaust manifold. During engine deceleration, when there is a rise in manifold vacuum, air is directed into the air cleaner or silencer even though the
solenoid is energized. The solenoid is de-energized when there is a malfunction in the electrical circuit, or high engine speeds over a prolong period.
