Hyundai Santa Fe (TM): Engine Control System / Heated Oxygen Sensor (HO2S). Description and operation

Hyundai Santa Fe (TM) 2019-2023 Service and Repair 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. It 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.

    Removal 1. Turn the ignition switch OFF and disconnect the battery negative (-) cable. 2.

    Specification HO2S [Bank 1 / Sensor 1] [Euro-V] Item Specification Heater Resistance (Ω) 2.

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    Hyundai Santa Fe (TM) 2019-2023 Service and Repair Manual: A/C Pressure Transducer. Description and operation

    Description The A/C Pressure Transducer (APT) converts the pressure value of high pressure line into voltage value after measuring it. By converted voltage value, engine ECU controls the cooling fan by operating it high speed or low speed.

    Hyundai Santa Fe (TM) 2019-2023 Service and Repair Manual: Evaporator Temperature Sensor. Repair procedures

    Inspection 1. Turn the ignition switch OFF. 2. Disconnect the evaporator temperature sensor connector. 3. Measure resistance between terminal "+" and "-" of the evaporator temperature sensor.

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