Air Switch Solenoid; Vacuum Storage Tank; Micro Computer Unit - Jeep 1987 Wrangler Workshop Manual

ENGINES
Jim
mm AIR SYSTEM
AIR SWITCH SOLENOID
The air switch solenoid controls the air control
valve by switching vacuum on and off. The
solenoid is controlled by the micro computer unit
(MCU).
VACUUM STORAGE TANK
Vacuum is stored in the tank until released by
the air switch solenoid.
MICRO COMPUTER UNIT (MCU)
The MCU switches air either UPSTREAM or
DOWNSTREAM, depending upon the engine
operating conditions by energizing and de-
energizing the air switch solenoids.
B-2S9