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Home >> Jeep Truck >> 1996 >> Grand Cherokee 4WD L6-242 4.0L VIN S MFI >> Repair and Diagnosis >> Powertrain Management >> Relays and Modules - Powertrain Management >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Description and Operation >> Other Controls >> Cruise Control

Cruise Control

CRUISE CONTROL
The Powertrain Control Module (PCM) controls vehicle speed by operation of the speed control servo vacuum and vent solenoids. Energizing the vacuum solenoid applies vacuum to the servo to increase throttle position. Operation of the vent solenoid slowly releases the vacuum allowing throttle position to decrease. A special dump solenoid allows immediate release of throttle position caused by braking, cruise control turn off, or ignition key off.

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