Cavalier/Z24 L4-144 2.4L DOHC VIN T SFI (1996)
Accessory Signal: Description and Operation
Cruise Control Status Signal
DESCRIPTION
The cruise control system is a speed control system that maintains a desired vehicle speed under normal driving conditions. The cruise control
system has the ability to cruise, coast, resume speed, accelerate, and tap-up and tap-down vehicle speed.
OPERATION
The main parts of the cruise control system are the cruise control switches, the cruise control module assembly, the vehicle speed sensor, the cruise
control release and stop lamp switch assemblies and the Powertrain Control Module (PCM).
The operation of the cruise control module is controlled by the cruise control switches located on the cruise control actuator lever assembly. All
cruise control functions are completed through this assembly.
The cruise control release and stop lamp switch assemblies are provided to disengage the cruise control system. When the brake pedal is
depressed, the cruise control system is electrically disabled. The cruise control module will remember what the vehicles cruise speed was set to
prior to disengaging. After reaching the enabling criteria for cruise operation, depressing the resume switch will allow the vehicle to return to the
previously set vehicle speed. The switch assemblies are mounted on the brake pedal bracket assembly.
COMPONENTS
The cruise control module assembly is mounted on the engine compartment fire wall. The cruise control system uses the cruise control module
assembly to obtain the desired vehicle speed. Two important components in the module assembly help to do this, an electronic control module and
an electric stepper motor. The control module uses a vehicle speed input from the PCM to determine how to adjust the electric stepper motor. The
motor moves a band and the throttle linkage in response to the control module to maintain the desired cruise speed.
The cruise control module, and the PCM, have a low speed limit which will prevent the cruise control system from engaging below a speed of 25
mph (40 km/h). The PCM also does not allow the cruise system to operate under certain conditions. When the cruise control system is enabled, the
cruise control module sends a signal to tell the PCM that it is controlling the vehicle speed. The cruise control module is not serviceable.
