VEHICLE SPEED CONTROL SYSTEM
TABLE OF CONTENTS
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DESCRIPTION AND OPERATION
SPEED CONTROL SYSTEM . . . . . . . . . . . . . . . . . 1
SPEED CONTROL SERVO-PCM OUTPUT. . . . . . . 2
SPEED CONTROL SWITCHES . . . . . . . . . . . . . . . 3
INTERACTIVE SPEED CONTROL . . . . . . . . . . . . . 3
BRAKE LAMP SWITCH. . . . . . . . . . . . . . . . . . . . . 4
SERVO CABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
POWERTRAIN CONTROL MODULE . . . . . . . . . . . 4
VACUUM RESERVOIR . . . . . . . . . . . . . . . . . . . . . 5
VEHICLE SPEED AND DISTANCE . . . . . . . . . . . . . 5
ROAD TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
CHECKING FOR DIAGNOSTIC CODES . . . . . . . . . 5
REMOVAL AND INSTALLATION
SERVO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SPEED CONTROL SWITCH. . . . . . . . . . . . . . . . . . 6
SPEED CONTROL SERVO CABLE. . . . . . . . . . . . . 6
VACUUM RESERVOIR . . . . . . . . . . . . . . . . . . . . . 7
DESCRIPTION AND OPERATION
SPEED CONTROL SYSTEM
DESCRIPTION
The speed control system is electronically con-
trolled and vacuum operated. The electronic control
is integrated into the powertrain control module,
located on the left side of the engine compartment
next to the air cleaner. The controls are located on
the steering wheel and consist of five switches. The
ON and OFF buttons are located on the left side of
the airbag module. The RESUME, ACCEL, SET,
COAST and CANCEL buttons are located on the
right side of the airbag module (Fig. 1). For identifi-
cation and location of the major components (Fig. 2).
The system is designed to operate at speeds above
30 mph (50 km/h).
WARNING: THE USE OF SPEED CONTROL IS NOT
RECOMMENDED WHEN DRIVING CONDITIONS DO
NOT PERMIT MAINTAINING A CONSTANT SPEED,
SUCH AS IN HEAVY TRAFFIC OR ON ROADS THAT
ARE WINDING, ICY, SNOW COVERED, OR SLIP-
PERY.
OPERATION
When speed control is activated by depressing the
ON switch, the PCM allows a set speed to be stored
in RAM for speed control. To store a set speed,
depress the SET switch while the vehicle is moving
at a speed between 30 and 85 mph. In order for the
speed control to engage, the brakes cannot be
applied, nor can the gear selector be indicating the
transmission is in Park or Neutral.
The speed control can be disengaged manually by:
• Stepping on the brake pedal
• Depressing the OFF switch
• Depressing the CANCEL switch.
• Depressing the clutch pedal
Fig. 1 Speed Control Switch
1 – SPEED CONTROL SWITCHES
2 – RES
ACCEL
3 – CANCEL
4 – SET
COAST
5 – OFF
6 – ON
JX
VEHICLE SPEED CONTROL SYSTEM
8H - 1