On my 1993 Dodge Dynasty LE, with 3.3L V6 and four speed automatic transmission, the cruise control does not work. It was sugggested that a fuse was bad, but the cruise control fuse (if any) is not located in the under-hood fuse box (with the relays). Vaccum lines are OK and not leaking, throttle control cable is OK, control servo looks fine and so do wire connections. What could be wrong?
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the cruise control is run by the input and output speed sensors on your transmission these speed sensors tells the pcm vehicle speed and engine rpms this in turn adjust the cruise control module to adjust throtle via cable to the throttle body.
there are 2 possible parts here, one is a transmission speed sensor, this part tells the cruise what speed u set and keep it there, the other is the the actual actuator that holds the throttle at the right position to maintain set speed, other less common issue's make sure the brake and clutch (if manual trans only) cruise cut off switche's are ok
Cruise control allows the driver to push a button thereby setting and holding the car's current speed. This allows you to take your foot off the acceleratot pedal and "cruise." Modern "Cruise" systems also have added feature like increasing or decreasing your speed, and coasting so that you can adjust your speed for traffic or road conditions without exiting the cruise function. Touching the brake pedal automatically turns the cruise function off; or you can exit by turning cruise button to "off" at the touch of your thumb or fingertips. Cruise helps on long trips by reducing fatigue, and keeps you from going over the speed limit by setting your speed to the posted limit.
Hope this helps. I will address overdrive in another post. Thanks, TaterTodd