Santa Fe, Vera Cruz 2006-2008

Heated Oxygen Sensor

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Operation



Specific to:

Hyundai Santa Fe 2006-2008

Hyundai Veracruz 2007-2008

The Heated Oxygen Sensor (HO2S) consists of zirconium and alumina and is installed upstream and downstream of the Manifold Catalyst Converter (MCC). After it compares the oxygen consistency of the atmosphere with the exhaust gas, it transfers the oxygen consistency of the exhaust gas to the PCM. This sensor operates most efficiently when the temperature of the sensor tip is higher than 698°F (370°C). Therefore, a heater has been integrated with the oxygen sensor that is controlled by the PCM duty signal. When the exhaust gas temperature is lower than the specified value, the heater warms the sensor tip. The PCM commands the heater ON or OFF to maintain a specific HO2S operating temperature range. The PCM monitors the voltage on the HO2S heater low control circuit for heater fault diagnosis. If the PCM detects that the HO2S heater low control circuit voltage is not within a specified range, a DTC is set.

The HO2S supplies the electronic control assembly with a signal indicating either a rich or lean mixture condition as the engine operates.

Removal & Installation



Specific to:

Hyundai Santa Fe 2006-2008

Hyundai Veracruz 2007-2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the electrical connector from the sensor.
  4.  
  5. Remove the Heated Oxygen Sensor (HO2S).
  6.  

To install:

  1. Installation is the reverse of the removal procedure.
    NOTE
    Apply anti-seize compound to the threaded portion of the sensor, prior to installation. Never apply anti-seize compound to the protector of the sensor.

  2.  

Testing



Specific to:

Hyundai Santa Fe 2006-2008

Hyundai Veracruz 2007-2008

  1. Perform a visual inspection of the sensor as follows:
    1. If the sensor tip has a black/sooty deposit, this may indicate a rich fuel mixture.
    2.  
    3. If the sensor tip has a white, gritty deposit, this may indicate an internal coolant leak.
    4.  
    5. If the sensor tip has a brown deposit, this could indicate oil consumption.
    6.  

  2.  
  3. Check that the heater resistance is according to specification.
  4.  
  5. Check that the output voltage in the rich/lean readings fluctuate according to specifications.

    Click image to see an enlarged view

    Fig. Heated oxygen sensor heater resistance specifications



    Click image to see an enlarged view

    Fig. Heated oxygen sensor rich/lean output voltage specifications

  6.  
  7. Connect an OBD2 scan tool to the Data Link Connector (DLC).
  8.  
  9. With the engine running, the normal waveform for the Heated Oxygen Sensor (HO2S) and the HO2S heater should be similar to those represented in the following waveform illustration.

    Click image to see an enlarged view

    Fig. Heated oxygen sensor cut-away view



    Click image to see an enlarged view

    Fig. Waveform of heated oxygen sensors and heater element

  10.  

 
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