Jeep Cherokee (XJ): Vacuum reservoir
DESCRIPTION
The vacuum reservoir is mounted to the front bumper bar behind the passenger side bumper end cap. The bumper end cap must be removed from the vehicle to access the vacuum reservoir for service.
OPERATION
Engine vacuum is stored in the vacuum reservoir.
The stored vacuum is used to operate the vacuumcontrolled vehicle accessories during periods of low engine vacuum such as when the vehicle is climbing a steep grade, or under other high engine load operating conditions.
The vacuum reservoir cannot be repaired and, if faulty or damaged, it must be replaced.
Refrigerant oil. Refrigerant system service port. Vacuum check valve
Other materials:
Modes of operation
OPERATION
As input signals to the Powertrain Control Module
(PCM) change, the PCM adjusts its response to the
output devices. For example, the PCM must calculate
different injector pulse width and ignition timing for
idle than it does for wide open throttle (WOT).
The PCM will operate in two ...