Computer Control

PURPOSE
Cruise control 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.

SYSTEM COMPONENTS
The main parts of the cruise control system are the functional control switches, cruise control module assembly, vehicle speed sensor, cruise control release and stop lamp switch assemblies and Powertrain Control Module (PCM).

Control Switches
The operation of the control module is controlled by functional control switches located on the cruise control actuator lever assembly. All cruise control functions are completed through this assembly.

Cruise Control Module Assembly
The cruise control module assembly is mounted on the right strut tower. The cruise control system uses the cruise control module assembly to obtain the desired vehicle cruise speed. Two important components in the module assembly help to do this. One is an electronic control module and the second is an electric stepper motor. The controller monitors vehicle speed through an input from the PCM and operates the electric stepper motor. The motor moves a band and throttle linkage, in response to the control module, to maintain a desired cruise speed. The module is not serviceable.

The cruise control module, as well as the PCM, contain a low speed limit which will prevent cruise system engagement below a minimum speed of 40 km/h (25 MPH). The PCM will also not allow cruise system operation under certain conditions. When cruise is enabled, the control module sends a signal to the PCM to tell it that it is controlling vehicle speed.

Release And Stop Lamp Switch Assemblies
The cruise control release and stop lamp switch assemblies are provided to disengage the cruise system. When the brake pedal assembly is depressed, the cruise control system is electrically disabled and the throttle is returned to the idle position. The control module will remember what the vehicles cruise speed was set to previously. 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.