Hyundai Palisade (LX2): Engine Control System / Knock Sensor (KS)

Hyundai Palisade (LX2) 2020-2026 Service Manual / Engine Control/Fuel System / Engine Control System / Knock Sensor (KS)

Description and operation

Description

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.

Hyundai Palisade. Description and operation

Specifications

Specification

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

Schematic diagrams

Circuit Diagram

Hyundai Palisade. Schematic diagrams

Harness Connector

Hyundai Palisade. Schematic diagrams

Repair procedures

Removal

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")

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)]

Hyundai Palisade. Repair procedures

[Knock Sensor (Bank 2)]

Hyundai Palisade. Repair procedures

Installation

•	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.

❮Camshaft Position Sensor (CMPS)

Description and operation Description Camshaft Position Sensor (CMPS) is a hall sensor, which detects the camshaft position by using a hall element.

Heated Oxygen Sensor (HO2S)❯

Description and operation Description Heated Oxygen Sensor (HO2S), consisting of zirconium and alumina, is installed on both upstream and downstream of the Manifold Catalytic Converter (MCC) to detect the air/fuel ratio and send it to the ECM.

Other information:

Hyundai Palisade (LX2) 2020-2026 Service Manual: Ambient Temperature Sensor

Description and operation Description The ambient temperature sensor is located at the front of the condenser and detects ambient air temperature. It is a negative type thermistor; resistance will increase with lower temperature, and decrease with higher temperature.

Hyundai Palisade (LX2) 2020-2026 Service Manual: Troubleshooting

Troubleshooting 1) After replacing H/UNIT, always check that the system operates properly. 2) If the failure persists after replacing the H/UNIT, do not replace the unit.