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.
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HOMESERVICE MANUALSCHEVROLET1994CORSICA L4-2.2L VIN 4REPAIR AND DIAGNOSISCRUISE CONTROLDESCRIPTION AND OPERATIONGENERAL SYSTEM DESCRIPTION
1994 Chevrolet Corsica L4-2.2L VIN 4
General System Description
1994 Chevrolet Corsica L4-2.2L VIN 4SECTION General System Description
DESCRIPTION
This system consists of a mode control assembly, Electronic Controller Module (ECM), Vehicle Speed Sensor (VSS) buffer amplifier, servo unit, and release switches and valves. The servo unit maintains vehicle speed (throttle position) by trapping vacuum in its diaphragm chamber at servo positions determined by the control module. The module monitors mode control switch position, signals from the VSS buffer amplifier, servo position and release switch operation, then operates vacuum valves within the servo unit to control servo operation and vehicle speed. The module also contains a speed limiting function which prevents system operation at speeds below approximately 25 mph.
OPERATION
The mode control assembly consists of a 3 position slide-type switch and a Set/Coast switch button. To operate the system, the slide switch must be in on position and vehicle speed must be above 25 mph. The system is engaged at the desired speed by fully depressing, then releasing the Set/Coast button. Cruise speed can be increased from the set position by accelerating vehicle to desired speed, then pressing and releasing button. In order to decrease speed, the Set/Coast button is held in the fully-depressed position (disengaging system), then released when the desired speed is reached. The system can be disengaged at any time by depressing the brake or clutch pedal, or by moving the slide switch to off position.
If the system is disengaged by depressing the brake or clutch pedal, the last set speed will be retained in the module memory until the slide switch or ignition switch is moved to off position. Momentarily moving the slide switch to the resume/accel. position will cause the vehicle to accelerate to the last set speed and maintain that speed. If the slide switch is held in the resume/accel. position, the vehicle will continue to accelerate until the switch is released. When the switch is released, the speed that the vehicle accelerated to becomes the new set speed.
The slide switch also allows a tap-up function to increase cruise set speed in 1 mph increments. With the cruise control engaged and operating, tapping-up is done by pressing the slide switch to the resume position, then quickly releasing it. This procedure can be repeated 10 times before the system must be reset to a new speed in the conventional manner.
This system consists of a mode control assembly, Electronic Controller Module (ECM), Vehicle Speed Sensor (VSS) buffer amplifier, servo unit, and release switches and valves. The servo unit maintains vehicle speed (throttle position) by trapping vacuum in its diaphragm chamber at servo positions determined by the control module. The module monitors mode control switch position, signals from the VSS buffer amplifier, servo position and release switch operation, then operates vacuum valves within the servo unit to control servo operation and vehicle speed. The module also contains a speed limiting function which prevents system operation at speeds below approximately 25 mph.
OPERATION
The mode control assembly consists of a 3 position slide-type switch and a Set/Coast switch button. To operate the system, the slide switch must be in on position and vehicle speed must be above 25 mph. The system is engaged at the desired speed by fully depressing, then releasing the Set/Coast button. Cruise speed can be increased from the set position by accelerating vehicle to desired speed, then pressing and releasing button. In order to decrease speed, the Set/Coast button is held in the fully-depressed position (disengaging system), then released when the desired speed is reached. The system can be disengaged at any time by depressing the brake or clutch pedal, or by moving the slide switch to off position.
If the system is disengaged by depressing the brake or clutch pedal, the last set speed will be retained in the module memory until the slide switch or ignition switch is moved to off position. Momentarily moving the slide switch to the resume/accel. position will cause the vehicle to accelerate to the last set speed and maintain that speed. If the slide switch is held in the resume/accel. position, the vehicle will continue to accelerate until the switch is released. When the switch is released, the speed that the vehicle accelerated to becomes the new set speed.
The slide switch also allows a tap-up function to increase cruise set speed in 1 mph increments. With the cruise control engaged and operating, tapping-up is done by pressing the slide switch to the resume position, then quickly releasing it. This procedure can be repeated 10 times before the system must be reset to a new speed in the conventional manner.
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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.