During engine operation, Intake Air By-Pass (IAB) control valve sends intake air to fuel injectors. This increases fuel atomization at injectors during throttle tip-in. See Fig 1, Fig 2 or Fig 3
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Fig 1: Identifying Intake Air By-Pass Control System Components (RSX)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 2: Identifying Intake Air By-Pass Control System Components (3.2CL & 3.2TL)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 3: Identifying Intake Air By-Pass Control System Components (3.5RL)