Hyundai Palisade: Engine Control System / Knock Sensor (KS)
Description and operation
Knocking is a phenomenon characterized by undesirable vibration and noise that
can cause engine damage. The two Knock Sensors (KS) are installed inside the
V-valley of the cylinder block and sense engine knocking.
When knocking occurs, the vibration from the cylinder block is applied as pressure
to the piezoelectric element, and the sensor produces voltage signal to ECM.
On receipt of this signal, ECM will control the ignition timing by retarding
the ignition timing and then advancing the ignition timing when the knocking
disappears.
This sequential control can improve engine power, torque and fuel economy.

Specifications
Item
|
Specification
|
Capacitance (pF)
|
850 - 1,150
|
Resistance (MΩ)
|
3.90 - 5.84
|
pin
|
2
|
Schematic diagrams

Harness Connector

Repair procedures
1. |
Switch "OFF" the ignition and disconnect the negative (-) battery terminal.
|
2. |
Disconnect the knock sensor connector (A).
[Knock Sensor (Bank 1)]

[Knock Sensor (Bank 2)]

|
3. |
Remove the intake manifold.
(Refer to Engine Mechanical System - "Intake Manifold")
|
4. |
Remove the mounting bolt (A), and then remove the sensor from the cylinder
block.
Knock sensor mounting bolt :
15.7 - 23.5 N.m (1.6 - 2.4 kgf.m, 11.6 - 17.4 lb-ft)
|
[Knock Sensor (Bank 1)]

[Knock Sensor (Bank 2)]

|
• |
Install the component to the specified torque.
|
• |
Note that internal damage may occur if the component drops.
In this case, use it after inspecting.
|
• |
The sensor connector must be installed parallel to the engine.
|
|
1. |
Install in the reverse order of removal.
|
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