The Kia Optima Power Steering Pressure Switch prevents the engine from stalling under conditions of sudden heavy steering pressure by using a fluid-fed pressure switch that sends information about the hydraulic pressure to the engine computer, which immediately increases the idle speed in a tight parking maneuver. Mounted on the high-pressure hose from the pump, this Power Steering Pressure Switch closes the circuit on the high-pressure hose as pressure approaches the pump's set limit, which then causes the control unit to take action within milliseconds. The durable Power Steering Pressure Switch also protects against pump overpressure. Early Kia Optima models were equipped with a basic on-off Power Steering Pressure Switch with traditional hydraulic assist, but subsequent generations of Kia Optima cars still have the switch and combine it with variable assist electronics that smooth low-speed turns but maintain road feel on the highway. Today many Kia Optima drivers still rely on the Power Steering Pressure Switch with the spring-loaded diaphragm design to detect excess force and protect the pump and engine.
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