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”
...
Specification
Item
Specification
Capacitance (pF)
950 ~ 1,350
Resistance (MΩ)
4.87
...
Other information:
Removal
1.
Remove the transaxle assembly.
G 1.6 GDI (Refer to Manual Transaxle System - " Manual Transaxle")
G 2.0 GDI (Refer to Manual Transaxle System - " Manual Transaxle")
G 2.0 MPI (Refer to Manual Transaxle S ...
Your vehicle is equipped with a Supplemental Restraint (Air Bag) System and lap/shoulder
belts at both the driver and passenger seating positions.
The indications of the system's presence are the letters "AIR BAG" intagliated
on the air bag pad cover in the steering wheel and the passenger's side ...