Circuit Operation

The stepper motor cruise control is a speed control system which maintains a desired vehicle speed under normal driving conditions. However, steep grades up or down may cause variations in the selected speed. The electronic controller monitors vehicle speed and operates the electric motor. The motor moves a connecting strap that is attached to the cruise control cable in response to an input from the controller. The cable moves the throttle linkage to vary throttle position in order to maintain the desired cruise speed. The cruise control module prevents system engagement below 40 km/h (25 mph). The module is controlled by mode control switches located on the multi-function lever.

With he ignition switch in RUN. battery voltage is supplied to the cruise control module at terminal F on CKT 339 (PNK). When the cruise switch is moved to the ON position, battery voltage is supplied to the cruise control module at terminal A on CKT 397 (GRY). If the brake pedal is not pressed, battery voltage is provided to the cruise control module at terminal D on CKT 420 (PPL). If the brake pedal is pressed, battery voltage is sent to the cruise control module at terminal G on CKT 20 (LT BLU).

When the cruise switch is moved to the R/A position, battery voltage is supplied to the cruise control module connector on terminal C on CKT 87 (GRY/BLK). With the SET/COAST switch pressed, battery voltage is sent to the cruise control module at terminal B on CKT 84 (DK BLU). The vehicle speed signal is supplied to the cruise control module at terminal K on CKT 817 (DK GRN/WHT). Ground is supplied to the module connector at terminal F on CKT 451(BLK/WHT). The PCM sends an engaged signal to the cruise control module at terminal J on CKT 396 (LT BLU/BLK). The PCM has the ability to disable cruise control if conditions are detected which would make cruise control operation undesirable using terminal II on CKT 83 (DK GRN).

The PCM inhibits cruise control operation under any of the following conditions:
^ Engine speed is too high.
^ Vehicle speed is too high.
^ PCM indicates that vehicle is in PARK, NEUTRAL, or REVERSE.
^ Vehicle acceleration rate is too high.
^ Traction control system is active for more than 2 seconds.