exj 8ha, JEEP Manuals, Electronic Service Manual (jeep cherokee xj do 2000)
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XJ
VEHICLE SPEED CONTROL SYSTEM
8H - 1
VEHICLE SPEED CONTROL SYSTEM
TABLE OF CONTENTS
page
DESCRIPTION AND OPERATION
DESCRIPTION AND OPERATION
speed control functions are used. The outputs from
these switches are filtered into one input. The MSA
determines which output has been applied through
resistive multiplexing.
The input circuit voltage is
measured by the MSA to determine which switch
function has been selected.
²
DIESEL ENGINE SPEED CONTROL SYSTEM
Unique features for the 2.5L diesel engine will be
covered in this section.
²
Models equipped with the 2.5L diesel engine do
not use a vacuum reservoir to retain engine vacuum
for speed control operation. There are no vaccum-op-
erated speed control servos used in vehicles with the
2.5L diesel engine.
²
A speed control indicator lamp, located on the
instrument panel cluster is energized by the MSA via
the CCD Bus. This occurs when speed control system
power has been turned ON, and the engine is run-
ning.
²
The range of the speed control system operation
is restricted to speeds between 56 km/h (35 MPH) to
145 km/h (90 MPH).
²
The two switch modules are labeled: ON/OFF,
SET, RESUME/ACCEL, CANCEL and COAST. Refer
to the owner’s manual for more information on speed
control switch functions and setting procedures. The
individual switches cannot be repaired. If one indi-
vidual
Inputs to the MSA that allow speed control oper-
ation
are
from
the
vehicle
speed
sensor
and
the
Speed Control Switch.
²
switch
fails,
the
switch
module
must
be
Two separate speed control switch modules are
mounted on the steering wheel to the left and right
side of the driver’s airbag module. Switch features
are:
²
replaced.
Within the two switch modules, five
momen-
tary
contact
switches,
supporting
seven
different
Â
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