Kia Rio: Engine Control System / Knock Sensor (KS)
Specifications
Knock Sensor (KS)
Item
|
Specification
|
Resistance(MΩ)
|
4.87
|
Capacitance (pF)
|
950 ~ 1,350
|
Type
|
Piezo-electricity
|
Pin
|
2
|
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. At this time, this sensor transfers the voltage signal
higher than the specified value to the ECM and the ECM retards the ignition timing.
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.

Schematic diagrams

Repair procedures
1. |
Turn ignition switch OFF and disconnect the battery negative (-) terminal.
|
2. |
Remove the intake manifold.
(Refer to Engine Mechanical System - "Intake Manifold")
|
3. |
Remove the installation bolt (A), and then remove the sensor from the
cylinder block.
Knock sensor installation bolt:
18.6 - 23.5 N.m (1.9 - 2.4 kgf.m, 13.7 - 17.4 lb-ft)
|


|
• |
Install the component with the specified torques.
|
• |
Note that internal damage may occur when the component is dropped.
In this case, use it after inspecting.
|
|
1. |
Installation is reverse of removal.
|
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•
Use fender covers to avoid damaging painted surfaces.
•
To avoid damage, unplug the wiring connectors carefully while
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