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There is a sensor which determines the amount the throttle pedal has been depressed. The throttle actuator moves the throttle plate open a corresponding amount using an electric motor. The cable is a backup which will open the throttle plate just a bit, in what's called "limp home mode". I'd hate to have to limp very far, you'll press like hell and get maybe 20-25mph out of it. It was mainly thought of as a means to say "get the car over the railroad tracks" if the actuator fails, I don't think it was ever "really" designed to be driven on that cable.
Gilly
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