When starting on a slope, this system keeps the vehicle from rolling away while the driver's foot moves from the brake pedal to the accelerator pedal. The ECM calculates the brake pressure required to keep the vehicle on a slope for a certain amount of time and commands the solenoid valves accordingly when the brake pedal is released. The hill start assist system is activated when the ECM detects that the driver is about to drive the vehicle up or down a hill for the following reasons:
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