Variable Induction Control Solenoid: Description and Operation

Intake Air Bypass (IAB) Control Solenoid Valve
When the engine speed is below 4,900 rpm, the IAB control solenoid valve is activated by a signal from the ECM, intake air flows through the long intake path, then high torque is delivered. At speeds higher than 4,900 rpm, the solenoid valve is deactivated by the ECM, and intake air flows through the short intake path in order to reduce the resistance in airflow.