Chrysler RAM TRUCK 2500 1994 Service Manual page 450

• VEHICLE SPEED CONTROL SYSTEM 8H - 1
WEHiCLE S P E E D CONTROL
S Y S T E M
C O N T E N T S
page
page
SERVICE PROCEDURES . . . . 11 TEST PROCEDURES 6
GENERAL INFORMATION
The vehicle speed control system (Fig. 1) is electri­
cally actuated and vacuum operated. The electronic con­
trol is integrated into the powertrain control module
(PCM). The PCM is located on the passenger side of the
dash panel in the engine compartment. The controls are
located on the steering wheel and consist of the OFF,
ON/CRUISE, RESUME/ACCEL and SET/COAST but­
tons. The system is designed to operate at speeds be­
tween 35 mph (50 km/h) and 85 mph (142 km/h).
WARNING: THE USE O F VEHICLE SPEED CON­
TROL IS NOT RECOMMENDED WHEN DRIVING
CONDITIONS DO NOT PERMIT MAINTAINING A
CONSTANT SPEED, SUCH AS I N HEAVY TRAFFIC
OR ON ROADS THAT ARE
W I N D I N G ,
ICY,
SNOW
COVERED, OR SLIPPERY
TO ACTIVATE: By pushing the ON/CRUISE but­
ton to the depressed latched position, ON, the speed
control function is now ready for use.
TO DEACTIVATE: A soft tap of the brake pedal,
normal brake use or clutch pedal use while the sys­
tem is engaged will disengage speed control without
erasing memory. A sudden increase i n engine speed
may be experienced i f the clutch pedal is depressed
while the speed control system is engaged. Pushing
the OFF button to unlatch the ON position or turn­
ing off the ignition erases the memory.
TO SET SPEED: When the vehicle has reached
the desired speed push the SET/COAST button to en­
gage system which will then automatically maintain
the desired speed.
TO DECELERATE: When speed control is en­
gaged, holding the SET/COAST button depressed al­
lows the vehicle to coast to a lower speed setting.
TO RESUME: After disengaging the speed control
system by tapping the brake or clutch pedal, push
the RESUME/ACCEL button to return vehicle to the
previously set speed.
TO ACCELERATE: While speed control is en­
gaged, hold the RESUME/ACCEL button depressed
and release at a new desired speed. This will allow
the vehicle to continuously accelerate and set at a
higher speed setting.
TAP-UP: When the speed control system is en­
gaged, tapping the RESUME/ACCEL button will in­
crease the speed setting by 2 mph (3 km/h). The
system will respond to multiple tap-ups.
TO ACCELERATE for PASSING: Depress the acceler­
ator as you would normally. When the pedal is released the
vehicle will return to the speed setting in memory.