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Home >> GMC >> 1993 >> Forward Control 4.3 Z, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Cruise Control System - P Series Trucks >> Description & Operation >> Cruise Control System

Cruise Control System

The AC electro-motor cruise system is a control system which maintains a desired vehicle speed under normal driving conditions. Also, it has the capability to cruise, coast, resume speed, accelerate, tap-up, and tap-down. The main components of the cruise control system are the turn signal lever, cruise control module, vehicle speed sensor, vehicle speed sensor buffer, electric brake release switches, and electrical harness.

The cruise control system uses a cruise control module to obtain the desired vehicle cruise operation. Two important Components in the module help to do this. One is an electronic controller and the second is an electric motor. The controller monitors vehicle speed and operates the electric motor. The motor in response to the controller moves a connecting strap and throttle linkage to maintain the desired cruise speed.

The cruise control module contains a low speed limit which will prevent system engagement below a minimum speed, about 25 MPH (40 km/h). The operation of the cruise is controlled by mode control switches located on the turn signal lever. Electric brake release switches are provided to disengage the cruise system. Two release switches are mounted on the brake pedal bracket, and one switch is attached to the clutch pedal bracket. When the brake pedal (or clutch pedal) is depressed, the cruise system is electrically disengaged and the throttle is returned to the idle position.