Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Cruise Control Systems: Operation: Notes
System operation is controlled by electronic controller module. The ECM monitors the vehicle speed through the speed sensor. It also monitors operation of the multi-function control switch, located on end of turn signal lever and servo position. As commands as relieved from the multi-function control switch, the electronic control module either holds the current position of the servo. Applies vacuum to the servo to increase throttle position (accelerates). Or vents vacuum from the servo to reduce vehicle speed (deceleration). System can be disengaged by turning off cruise control switch or by activating brake or clutch (M/T) release switches. A vacuum release valve controls servo vacuum release to the atmosphere as either pedal is depressed. This allows servo to quickly release throttle linkage, returning throttle to idle position.
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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