Hyundai i-30: Engine Control System / Heated Oxygen Sensor (HO2S)

Hyundai i30 (PD) 2018-2024 Service Manual / Engine Control / Fuel System / Engine Control System / Heated Oxygen Sensor (HO2S)

Description and operation
Description
Heated Oxygen Sensor (HO2S) consists of zirconium and alumina and is installed both upstream and downstream of the Manifold Catalytic Converter. The sensor output voltage varies in accordance with the air/fuel ratio.
The sensor must be hot in order to operate normally. To keep it hot, the sensor has a heater which is controlled by the ECM via a duty cycle signal. When the exhaust gas temperature is lower than the specified value, the heater warms the sensor tip.

Specifications
Specification
HO2S [Bank 1 / Sensor 1] (Linear type)
Item
Specification
Heater Resistance (Ω)
Approx. 2.5 [20°C (68°F)]

HO2S [Bank 1 / Sensor 2] (Binary type)
Item
Specification
Heater Resistance (Ω)
Approx. 3.0 [20°C (68°F)]

Schematic diagrams
Circuit Diagram

Harness Connector
HO2S [Bank 1 / Sensor 1]

HO2S [Bank 1 / Sensor 2]

Repair procedures
Inspection
1.
Turn the ignition switch OFF.
2.
Disconnect the HO2S connector.
3.
Measure resistance between the HO2S terminals 2 and 5 [B1/S1].
4.
Measure resistance between the HO2S terminals 3 and 4 [B1/S2].
5.
Check that the resistance is within the specification.
Specification : Refer to "Specification"
Removal
[Bank 1 / Sensor 1]
1.
Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2.
Disconnect the connector (A), and then remove the sensor (B).
  
Note that the SST (Part No. : 09392-1Y100) is useful when removing the heated oxygen sensor.

[Bank 1 / Sensor 2]
1.
Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2.
Disconnect the connector (A), and then remove the sensor (B).

Installation
  
Install the component with the specified torques.
Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing.
  
DON’T use a cleaner, spray, or grease to sensing element and connector of the sensor because oil component in them may malfunction the sensor performance.
Sensor and its wiring may be damaged in case of contacting with the exhaust system (Exhaust Manifold, Catalytic Converter, and so on).
1.
Install in the reverse order of removal.
Heated oxygen sensor installation :
39.2 - 49.1 N.m (4.0 - 5.0 kgf.m, 28.9 - 36.2 lb-ft)

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