Kia Rio: Engine Control System / Heated Oxygen Sensor (HO2S)

Kia Rio 2017-2020 YB Service Manual / Engine Control / Fuel System / Engine Control System / Heated Oxygen Sensor (HO2S)

Specifications
Specification

Heated Oxygen Sensor (HO2S)

HO2S [Bank 1/Sensor 1]

Item
Specification
Heater Resistance (Ω)
Approximately 9.0 [20°C(68°F)]
Type
Binary
Pin
4

HO2S [Bank 1/Sensor 2]

Item
Specification
Heater Resistance (Ω)
Approximately 9.0 [20°C(68°F)]
Type
Binary
Pin
4

Description and operation
Description

Heated Oxygen Sensor (HO2S) consists of zirconium and alumina and is installed on upstream and downstream of the Warm up Catalytic Converter (WCC).

After it compares oxygen consistency of the atmosphere with the exhaust gas, it transfers the corresponding voltage signal to the ECM. When A/F ratio is rich or lean, it generates approximately +1V or 0V respectively.

In order that this sensor normally operates, the temperature of the sensor tip must be higher than predetermined temperature. So it has a heater which is controlled by the ECM duty signal. When the exhaust gas temperature is lower than the specified value, the heater warms the sensor tip.

Schematic diagrams
Circuit Diagram

Repair procedures
Inspection
1.

Check signal waveform of HO2S using a KDS/GDS.

Specification : Refer to "Waveform"

2.

Turn the ignition switch OFF.

3.

Disconnect the HO2S connector.

4.

Measure resistance between HO2S heater terminals 3 and 4.

5.

Check that the resistance is within the specification.

Specification: Approximately 9.0 Ω [20 °C (68 °F)]

Removal
  

Note that the SST (Part No.: 09392-2H100 or 09392-1Y100) is useful when removing the heated oxygen sensor.

1.

Turn the ignition switch OFF and disconnect the battery negative (-) terminal.

2.

Disconnect the connector (A), and then remove the sensor (B).

Heated oxygen sensor installation:

39.2 - 49.1 N.m (4.0 - 5.0 kgf.m, 28.9 - 36.2 lb-ft)

[Bank 1 / Sensor 1]

[Bank 1 / Sensor 2]

Installation
  

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.

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.

Installation is reverse of removal.

Troubleshooting
Waveform
[Sensor 1, 2]

[Bank 1 / Sensor 1]

[Bank 1 / Sensor 2]

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