Kia Optima: Knock Sensor (KS). Description and OperationWhen knocking occurs, the vibration from the cylinder block is applied as pressure to the piezoelectric element. When a knock occurs, the sensor produces voltage signal. The ECM retards the ignition timing when knocking occurs. If the knocking disappears after retarding the ignition timing, the ECM will advance the ignition timing. This sequential control can improve engine power, torque and fuel economy.

Installation
Knock Sensor (KS). SpecificationsRelay Box (Engine Compartment). Repair procedures
Inspection
Power Relay Test (Type A)
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Do not use pliers.
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Pliers will damage the
re ...
Condition and operation in the front passenger occupant detection system
*1) The system judges a person of adult size as an adult. When a smaller adult
sits in the front passenger seat, the system may recognize him/her as a child depending
on his/her physique and pos ...
Air Conditioning Switch
Press the switch to turn the air conditioning system on. An indicator light in
the switch will illuminate when the fan switch is on indicating air conditioning
system operation. Press the switch ...