Chrysler 1998 Voyager Service Manual page 427

NS/GS
VEHICLE SPEED CONTROL SYSTEM
GENERAL INFORMATION
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL INFORMATION
INTRODUCTION
This group covers both Left-Hand Drive (LHD) and
Right-Hand Drive (RHD) versions of this model.
Whenever feasible, the RHD versions of affected
vehicle components have been constructed as mirror-
image of the LHD versions. While most of the illus-
trations used in this group represent only the LHD
version, the diagnostic and service procedures out-
lined can generally be applied to either version.
Exceptions to this rule have been clearly identified as
LHD or RHD, if a special illustration or procedure
was/is required.
The speed control system used with the 2.5L diesel
engine is basically identical to the system used with
gasoline powered engines. Features unique to the
diesel engine will be covered in this section.
• 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.
• The range of the speed control system operation
is restricted to speeds between 56 km/h (35 MPH) to
145 km/h (90 MPH).
• Inputs to the MSA that allow speed control oper-
ation are from the vehicle speed sensor and the
Speed Control Switch.
VEHICLE SPEED CONTROL SYSTEM
CONTENTS
page
• 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:
a. Within the two switch modules, five momen-
tary contact switches, supporting seven different
speed control functions are used.
b. 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.
c. 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 running.
d. 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 pro-
cedures.
repaired. If one individual switch fails, the switch
module must be replaced.
The individual switches
8H - 1
cannot be