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

- 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.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.

1.In the engine control system, failure can be quickly diagnosed by using the diagnosis tool.

(1)Self diagnosis : Checking failure and code number (DTC).

(2)Current data : Checking the system input/output data state.

(3)Actuation test : Checking the system operation condition.

(4)Additional function : Controlling other features including system option setting and zero point adjustment.

1.Disconnect the battery negative (-) terminal.

2.Remove the HO2S connector.(Refer to "Removal" procedure)

3.Measure resistance between HO2S heater terminals.

Bank1 / Sensor1 : Terminal 4 - Terminal 5Bank1 / Sensor2 : Terminal 3 - Terminal 4

4.Check the resistance is within the specification.

Specification Bank 1 / Sensor 1 : 2.8 - 4.5ΩBank 1 / Sensor 2 : 3.3 - 4.1Ω

• Be careful not to damage the parts located under the vehicle (floor under cover, canister, fuel tank) when raising the vehicle using the lift.(Refer to General Information - "Lift and Support Points")

1.Disconnect the battery nagetive (-) terminal.

2.Disconnect the heated oxygen sensor connector (A).

3.Remove the connector (A) from the bracket.

4.Remove the heated oxygen sensor using the special tool [SST No. : 09392-1Y100 or 09392-2H100] as shown below.

Tightening Torque :39.2 - 49.0 N.m (4.0 - 5.0 kgf.m, 28.9 - 36.1 lb-ft)

1.Disconnect the battery nagetive (-) terminal.

2.Disconnect the heated oxygen sensor connector (A).

3.Remove the connector (A) from the bracket and then disconnecting the wiring from the wiring mounting holder (B).

4.Remove the heated oxygen sensor using the special tool [SST No. : 09392-1Y100 or 09392-2H100] as shown below.

Tightening Torque :39.2 - 49.0 N.m (4.0 - 5.0 kgf.m, 28.9 - 36.1 lb-ft)

• 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.Install in the reverse order of removal.