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Home >> Hyundai >> 2006 >> Santa Fe Limited, FWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel System (G6CU-GSL 3.5) >> Gasoline Engine Control System >> Heated Oxygen Sensor (Ho2S) >> Inspection

Heated Oxygen Sensor (Ho2S): Inspection

NOTE:
  • Before checking, warm up the engine until the engine coolant temperature reaches 80 to 95°C(176 to 205°F).
  • Use an accurate digital voltmeter.
  1. Disconnect the oxygen sensor connector, and measure the resistance between terminal 3 and terminal 4.
    TEMPERATURE SPECIFICATION

    Temperature °C(°F) Resistance (Ω)
    400 (752) 30 or more
    Fig 1: Disconnecting Oxygen Sensor Connector
    G04931591Courtesy of HYUNDAI MOTOR CO.
  2. Replace the oxygen sensor if there is a malfunction.
  3. Apply battery voltage directly between terminal 3 and terminal 4.
    NOTE: Be careful when applying the voltage. Damage will result if terminals 1 and 2 are connected to any voltage.
  4. Connect a high-impedance digital-type voltmeter between terminal 1 and terminal 2.
    Fig 2: Identifying Oxygen Sensor Connector Terminals
    G04931592Courtesy of HYUNDAI MOTOR CO.
  5. While repeatedly racing the engine, measure the oxygen sensor output voltage.
    VOLTAGE SPECIFICATION

    Engine Oxygen sensor output voltage Resistance (Ω)
    Race Min. 0.6V 30 or more
    Fig 3: Front Oxygen Sensor Output Voltage Graph
    G04931593Courtesy of HYUNDAI MOTOR CO.
    Fig 4: Oxygen Sensor Output Voltage Graph
    G04931594Courtesy of HYUNDAI MOTOR CO.
  6. If there is a problem, there may be an oxygen sensor malfunction.

    Tightening torque 

    Heated oxygen sensor:

    40~50 Nm (400~500 kg.cm, 29~36 lb.ft)

    Fig 5: Identifying Oxygen Sensor Connector Terminals
    G04931595Courtesy of HYUNDAI MOTOR CO.
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