Hyundai Palisade: Engine Control System / Heated Oxygen Sensor (HO2S)

Hyundai Palisade (LX2) 2020-2025 Service Manual / Engine Control/Fuel System / Engine Control System / 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.
In order that this sensor operates properly, the temperature of the sensor tip must be higher than 370°C (698°F). For this reason, a heater controlled by the ECM duty signal, is built into the sensor.
When the exhaust gas temperature is lower than the specified value, the heater warms the sensor tip.

Hyundai Palisade. Description and operation

Specifications
Specification
Heated Oxygen Sensor (HO2S) [Banks 1, 2 / Sensor 1]
▷ Type : Zirconia (ZrO2) [Linear] Type
▷ Specification
Item
Specification
Heater Resistance (Ω)
 2.4 - 4.0 [20°C (68°F)]
Operation Voltage (V)
 12
pin
 6

Heated Oxygen Sensor (HO2S) [Banks 1, 2 / Sensor 2]
▷ Type : Zirconia (ZrO2) [Binary] Type
▷ Specification
Item
Specification
Heater Resistance (Ω)
 3.3 - 4.1 [20°C (68°F)]
pin
 4

Schematic diagrams
Circuit Diagram

Hyundai Palisade. Schematic diagrams

Repair procedures
Inspection
1.
Switch "OFF" the ignition.
2.
Disconnect the HO2S connector.
3.
Measure resistance between the HO2S terminals 2 and 5 [Bank 1 / Sensor 1, Bank 2 / Sensor 1]
Measure resistance between the HO2S terminals 1 and 2 [Bank 1 / Sensor 2, Bank 2 / Sensor 2]
4.
Check that the resistance is within the specification.
Specification :
2.4 - 4.0Ω [20°C (68°F)] [Bank 1 / Sensor 1, Bank 2 / Sensor 1]
3.3 - 4.1Ω [20°C (68°F)] [Bank 1 / Sensor 2, Bank 2 / Sensor 2]
Removal
1.
Switch "OFF" the ignition and disconnect the negative (-) battery terminal.
2.
Remove the oxygen sensor (B) after disconnect the Connector (A).
Hyundai Palisade. Repair procedures   
•
Note that the SST (Part No.: 09392-2H100 or 09392-1Y100) can be used for removing the heated oxygen sensor.
Heated oxygen sensor :
35.3 - 45.1 N.m (3.6 - 4.6 kgf.m, 26.0 - 33.3 lb-ft)
[Bank 1 / Sensor 1]

Hyundai Palisade. Repair procedures

Hyundai Palisade. Repair procedures

[Bank 1 / Sensor 2]

Hyundai Palisade. Repair procedures

Hyundai Palisade. Repair procedures

[Bank 2 / Sensor 1]

Hyundai Palisade. Repair procedures

Hyundai Palisade. Repair procedures

[Bank 2 / Sensor 2]

Hyundai Palisade. Repair procedures

Hyundai Palisade. Repair procedures
Installation
Hyundai Palisade. Repair procedures   
•
Install the component to the specified torque.
•
Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing.
•
Keep the sensing element and connector free from cleaner, spray or grease as oil substance may cause the sensor to malfunction.
•
Sensor and its wiring may get damaged from contact with the exhaust system (e.g. Exhaust Manifold, Catalytic Converter).
1.
Install in the reverse order of removal.

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