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Cruise Control
- How the Circuit Works
A throttle actuator control motor, located on the
side of the throttle housing, is used to open and
close the throttle plate for routine driving and
cruise conditions.
Power Supply
With the ignition switch in the ON (11) position,
battery voltage is applied through fuse 6 (in the
under-dash fuse/relay box) to the cruise control
main switch and to the ECM. Battery voltage is
also applied through fuses 5 and 25 (in the
under-dash fuse/relay box) to the gauge assembly.
Fuse 14 (in the under-dash fuse/relay box) is hot in
on and supplies battery voltage to the throttle
actuator control module when the throttle actuator
module relay is closed.
Fuse 47 (in the main under-hood fuse/relay box) is
hot at all times and supplies battery voltage to the
ECM when the brake pedal position switch is
closed (brake pedal pressed).
or by turning the main switch off.
If the system is disengaged temporarily by the
brake pedal position switch or the clutch pedal
position switch, and the vehicle's speed is still
above 25 mph (40 KmH), pressing the
RES/ACCEL switch will return the vehicle to the
previously set speed automatically.
For gradual acceleration without pressing the
accelerator pedal, push the RES/ACCEL switch
and hold it. To increase the speed in very small
amounts, tap the RES/ACCEL switch one time for
each one mph (KmH) of increase.
To slow the vehicle, push the DECEL/SET switch
in and hold it. To decrease the speed in very small
amounts, tap the RES/ACCEL switch one time for
each one mph (KmH) of decrease.
Refer to the Service Manual (Section 4, Engine
Electrical) for specific tests or troubleshooting
procedures.
System Description
The gauge assembly receives information signals
about operating conditions from the main switch
and from the set switch, cancel switch, and the
resume switch in the steering wheel.
The control unit compares the actual speed of the
vehicle to the selected speed, and then opens or
closes the throttle as necessary to match the
selected speed.
The brake pedal position switch releases the
system's control of the throttle at the instant the
brake pedal is pressed. The switch sends a signal
to the ECM by applying power to the ECM on one
circuit and removing power from the ECM on
another circuit. The control unit responds by
allowing the throttle to close.
The clutch pedal position switch sends a
"disengage" signal that allows the throttle to close
(cruise deactivated) when the clutch pedal is
pressed.
The throttle actuator control module sends signals
to the TP sensor/throttle actuator, which regulates
the throttle position to maintain the selected speed.
When you push the D E C E L / S E T switch to set the
cruise, the CRUISE CONTROL indicator on the
gauge assembly lights up. You can cancel the
cruise control system by pushing the cancel switch
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