Intake Air Bypass (Iab) Control System - Honda Prelude 1993 Service Manual

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lntake Air Bypass (lABl Control System fExcept F22A1 engi,ne (Sll

Two air intake paths are provided in the intake manifold to allow the selection of the intake path most tavorable for a

given engine speed.

Optimum perlormance at any RPM is achieved by c\osing and opening the \ntake Air ByDass (tA,Bl \ratves. High torque

at low RPM is acheived when the IAB valves are closed, whereas high powe, at high RPM is achieved wh€n the IAB

valves are ooened.

IAB VACUUM TANK

9i['-_-------> I$.i"u

tEcM] (15 A]

IAB CONTROL SOLENOID VALVE OFF

ET{GINE RPM IS ABOVE

4,800 rpm (H23A1 onginel

or 4,600 .pm (ll22Al €nginol

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