Kia Carens: Engine Control System / Knock Sensor (KS) Description and operation
Knocking is a phenomenon characterized by undesirable vibration and noise and
can cause engine damage. Knock Sensor (KS) is installed on the cylinder block
and senses engine knocking.
When 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.

Inspection
1.
Check the signal waveform of the CMPS and CKPS using the GDS.
Specification: Refer to “Wave Form”
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Specification
Item
Specification
Capacitance (pF)
950 ~ 1,350
Resistance (MΩ)
4.87
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Other information:
Component Location
1. BCM
2. Ultrasonic sensor
※ Parking assist control unit
function and buzzer are built in BCM (body control unit).
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When the wiper blade is not in a normal position, place the ignition switch in
the ON position. The wiper blade will return to the normal position.
Following are cases a wiper blade may be in an abnormal position.
- The wiper blade may be positioned abnormally when in an automatic vehicle wash.
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