Acura NSX 1991 Manual page 274

Main Menu
Intake Air System
Intake Air Bypass (IAB) Control System
Description
Satisfactory power performance is achieved by closing and opening the intake air bypass (IAB) control valves. High torque
at low engine speed is achieved when the valves are closed, whereas high power at high engine speed is achieved when
the valves are opened.
OPEN: HIGH ENGINE SPEED
CLOSED: LOW ENGINE SPEED
IAB
CONTROL
DIAPHRAGM
Table of Contents
INTAKE AIR BYPASS (IAB) CONTROL
SOLENOID VALVE ON
ENGINE SPEED IS ABOVE 4,800 rpm
IAB CONTROL
SOLENOID
VALVE
IAB
CONTROL
VALVE
To No. 5 BACK-UP LIGHTS
ALTERNATOR TURN SIGNALS
(15 A) FUSE