Hyundai Car 1999-05

Heated Oxygen Sensor

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Operation



The sensor senses the oxygen concentration in the exhaust gas then converts it into a voltage and sends it on to the ECM. The sensor gives an output of about 800mV, when the air fuel ratio is richer than the theoretical ratio and output of about 100mv when the ratio is leaner. The ECM controls fuel injection based on the signal so that the air fuel ratio is maintained at the theoretical ration.

The exhaust gas oxygen sensor supplies the electronic control assembly with a signal which indicates either a rich or lean mixture condition, during the engine operation.

The exhaust gas oxygen sensor supplies the electronic control assembly with a signal which indicates either a rich or lean mixture condition, during the engine operation.

The exhaust gas oxygen sensor supplies the electronic control assembly with a signal which indicates either a rich or lean mixture condition, during the engine operation.

The sensor senses the oxygen concentration in the exhaust gas then converts it into a voltage and sends it on to the ECM. The sensor gives an output of about 800mV, when the air fuel ratio is richer than the theoretical ratio and output of about 100mv when the ratio is leaner. The ECM controls fuel injection based on the signal so that the air fuel ratio is maintained at the theoretical ratio.

The exhaust gas oxygen sensor supplies the electronic control assembly with a signal which indicates either a rich or lean mixture condition, during the engine operation.

Removal & Installation



  1. Disconnect the electrical connector from the sensor.
  2.  
  3. Remove the oxygen sensor.
  4.  

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.  
  3. Tighten the sensor to 37-44 ft. lbs.
  4.  

  1. Disconnect the electrical connector from the sensor.
  2.  
  3. Remove the oxygen sensor.
  4.  

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.  

  1. Disconnect the electrical connector from the sensor.
  2.  
  3. Remove the oxygen sensor.
  4.  

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.  

  1. Disconnect the electrical connector from the sensor.
  2.  
  3. Remove the oxygen sensor.
  4.  

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.  

  1. Disconnect the electrical connector from the sensor.
  2.  
  3. Remove the oxygen sensor.
  4.  

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.  
  3. Tighten the sensor to 37-44 ft. lbs.
  4.  

  1. Disconnect the electrical connector from the sensor.
  2.  
  3. Remove the oxygen sensor.
  4.  

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



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 excessive oil consumption.
  6.  
  7. Warm the engine until the coolant temperature reaches operating temperature.
  8.  
  9. Accelerate the engine to 4000 RPM. When decelerating suddenly from 4000 RPM, the voltmeter reading should be 200mV or lower.
  10.  
  11. When the engine is suddenly raced, the voltmeter reading should be 600-1000mV.
  12.  
  13. If measured value is not within specification, replace the sensor.
  14.  

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 excessive oil consumption.
  6.  
  7. Warm the engine until the coolant temperature reaches operating temperature.
  8.  
  9. Accelerate the engine to 4000 rpm. When decelerating suddenly from 4000 rpm, the voltmeter reading should be 200mV or lower.
  10.  
  11. When the engine is suddenly raced, the voltmeter reading should be 600-1000mV.
  12.  
  13. If measured value is not within specification, replace the sensor.
  14.  

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 excessive oil consumption.
  6.  
  7. Turn the ignition switch to the OFF position.
  8.  
  9. Disconnect the sensor connector.
  10.  
  11. Measure the resistance between terminals 3 and 4, of the connector.
  12.  
  13. Specification should be 9 ohms at 68-75.2 degrees F.
  14.  
  15. If not, replace the sensor.
  16.  

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 excessive oil consumption.
  6.  
  7. Disconnect the sensor connector.
  8.  
  9. Measure the resistance between terminals 5 and 6 (component side).
  10.  
  11. Specification should be 9 ohms at 20-24 degrees C.
  12.  
  13. If within specification, check for poor connection between the PCM and the component.
  14.  
  15. If not, substitute the sensor with a known good component, check for proper operation. If problem corrected replace the sensor.
  16.  

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 excessive oil consumption.
  6.  
  7. Warm the engine until the coolant temperature reaches operating temperature.
  8.  
  9. Accelerate the engine to 4000 rpm. When decelerating suddenly from 4000 rpm, the voltmeter reading should be 200mV or lower.
  10.  
  11. When the engine is suddenly raced, the voltmeter reading should be 600-1000mV.
  12.  
  13. If measured value is not within specification, replace the sensor.
  14.  

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 excessive oil consumption.
  6.  
  7. Warm the engine until the coolant temperature reaches operating temperature.
  8.  
  9. Disconnect the sensor electrical connector and measure the resistance between terminal 3 and 4.
  10.  
  11. Specification should be 7-40 ohms.
  12.  
  13. If within specification, substitute with a known good PCM and check for proper operation. If the problem is corrected replace the PCM.
  14.  
  15. If not within specification, substitute with a known good sensor and check for proper operation. If the problem is corrected replace the sensor.
  16.  

2.0L Engine

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 excessive oil consumption.
  6.  
  7. Warm the engine until the coolant temperature reaches operating temperature.
  8.  
  9. Accelerate the engine to 4000 rpm. When decelerating suddenly from 4000 rpm, the voltmeter reading should be 200mV or lower.
  10.  
  11. When the engine is suddenly raced, the voltmeter reading should be 600-1000mV.
  12.  
  13. If measured value is not within specification, replace the sensor.
  14.  

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 excessive oil consumption.
  6.  
  7. Turn the ignition switch to the OFF position.
  8.  
  9. Disconnect the sensor connector.
  10.  
  11. Measure the resistance between terminals 3 and 4 (component side).
  12.  
  13. Specification should be 9 ohms at 68-75.2 degrees F.
  14.  
  15. If not, replace the sensor.
  16.  

2.4L Engine

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 excessive oil consumption.
  6.  
  7. Warm the engine until the coolant temperature reaches 176-205 degrees F.
  8.  
  9. Accelerate the engine to 4000 rpm. When decelerating suddenly from 4000 rpm, the voltmeter reading should be 200mV or lower.
  10.  
  11. When the engine is suddenly raced, the voltmeter reading should be 600-1000mV.
  12.  
  13. If measured value is not within specification, replace the sensor.
  14.  
  15. Turn the ignition switch to the OFF position.
  16.  
  17. Disconnect the sensor connector.
  18.  
  19. Measure the resistance between terminals 3 and 4 (component side).
  20.  
  21. Specification should be 30 ohms or more at 752 degrees F.
  22.  
  23. If not, replace the sensor.
  24.  
  25. Apply battery voltage directly between terminal 3 and 4.
    NOTE
    Take care when applying the voltage. Damage will result if the terminals are incorrect or short circuited.

  26.  
  27. Connect a digital voltmeter between terminal 1 and 2.
  28.  
  29. While racing the engine, measure the sensor output voltage. Specification should be 0.6 volt (minimum).
  30.  
  31. If not, replace the sensor.
  32.  

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 excessive oil consumption.
  6.  
  7. Warm the engine until the coolant temperature reaches 176-205 degrees F.
  8.  
  9. Accelerate the engine to 4000 rpm. When decelerating suddenly from 4000 rpm, the voltmeter reading should be 200mV or lower.
  10.  
  11. When the engine is suddenly raced, the voltmeter reading should be 600-1000mV.
  12.  
  13. If measured value is not within specification, replace the sensor.
  14.  
  15. Disconnect the sensor connector.
  16.  
  17. Measure the resistance between terminals 3 and 4 (component side).
  18.  
  19. Specification should be 5.0-7.0 ohms.
  20.  
  21. If not, replace the sensor.
  22.  
  23. Apply battery voltage directly between terminal 3 and 4.
    NOTE
    Take care when applying the voltage. Damage will result if the terminals are incorrect or short circuited.

  24.  
  25. Connect a digital voltmeter between terminal 1 and 2.
  26.  
  27. While racing the engine, measure the sensor output voltage. Specification should be 0.6 volt (minimum).
  28.  
  29. If not, replace the sensor.
  30.  

2.5L & 2.7L Engines

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 excessive oil consumption.
  6.  
  7. Warm the engine until the coolant temperature reaches 176-205 degrees F.
  8.  
  9. Accelerate the engine to 4000 rpm. When decelerating suddenly from 4000 rpm, the voltmeter reading should be 200mV or lower.
  10.  
  11. When the engine is suddenly raced, the voltmeter reading should be 600-1000mV.
  12.  
  13. If measured value is not within specification, replace the sensor.
  14.  
  15. Apply battery voltage directly between terminal 3 and 4.
    NOTE
    Take care when applying the voltage. Damage will result if the terminals are incorrect or short circuited.

  16.  
  17. Connect a digital voltmeter between terminal 1 and 2.
  18.  
  19. While racing the engine, measure the sensor output voltage. Specification should be 4.5 volt for 2.5L engine and 4000-4500 mV for 2.7L engine.
  20.  
  21. If not, replace the sensor.
  22.  

2.7L Engine

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 excessive oil consumption.
  6.  
  7. Warm the engine until the coolant temperature reaches operating temperature.
  8.  
  9. Accelerate the engine to 4000 rpm. When decelerating suddenly from 4000 rpm, the voltmeter reading should be 200mV or lower.
  10.  
  11. When the engine is suddenly raced, the voltmeter reading should be 600-1000mV.
  12.  
  13. If measured value is not within specification, replace the sensor.
  14.  

Sensor One

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 excessive oil consumption.
  6.  
  7. Warm the engine until the engine reaches operating temperature.
  8.  
  9. Connect the scan tool and monitor sensor operation.
  10.  
  11. Verify that the signal is switching from rich (above 0.45 volt) to lean (below 0.45 volt) a minimum of 3 times in 10 seconds (voltage will vary between 0.1-0.9 volt).
  12.  
  13. If the sensor is operating properly, check for poor connection between the ECM and the component.
  14.  
  15. If not, check the sensor for contamination, deterioration or damage.
  16.  
  17. Substitute the sensor with a known good component, check for proper operation. If problem corrected replace the sensor.
  18.  

Sensor Two

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 excessive oil consumption.
  6.  
  7. Warm the engine until the engine reaches operating temperature.
  8.  
  9. Measure the resistance between terminals 3 and 4 (component side).
  10.  
  11. Specification should be 3-4 ohms at 68-75.2 degrees F.
  12.  
  13. If not, replace the sensor.
  14.  

 
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