Mitsubishi Montero, Sport 1998-06

Heated Oxygen Sensor

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Operation



A voltage corresponding to the Heated Oxygen (HO2S) Sensor concentration in the exhaust gas is sent to the ECM/PCM from the output terminal of the sensor. The sensor is grounded with the ECM/PCM.

A voltage corresponding to the Heated Oxygen (HO2S) Sensor concentration in the exhaust gas is sent to the ECM/PCM from the output terminal of the sensor. The sensor is grounded with the ECM/PCM.

Removal & Installation




CAUTION
The temperature of the exhaust system is extremely high after the engine has been run. To prevent personal injury, allow the exhaust system to cool completely before removing sensor from the exhaust system.

  1. Detach the negative battery cable.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Detach the electrical connector from the oxygen sensor.
  6.  
  7. Using socket MD998770, or equivalent oxygen sensor socket, remove the oxygen sensor.
  8.  

To install:

  1. If installing old oxygen sensor, coat the threads with anti-seize compound. New sensors are already coated. Take care not to contaminate the oxygen sensor probe with the anti-seize compound.
  2.  
  3. Install the oxygen sensor into the exhaust manifold. Tighten the sensor, using the correct tool, to 33 ft. lbs. (45 Nm)
  4.  
  5. Attach the wiring to the sensor.
  6.  
  7. Carefully lower the vehicle.
  8.  
  9. Connect the negative battery cable.
  10.  


CAUTION
The temperature of the exhaust system is extremely high after the engine has been run. To prevent personal injury, allow the exhaust system to cool completely before removing sensor from the exhaust system.

  1. Detach the negative battery cable.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Detach the electrical connector from the oxygen sensor.
  6.  
  7. Using socket MD998770, or equivalent oxygen sensor socket, remove the oxygen sensor.
  8.  

To install:

  1. If installing old oxygen sensor, coat the threads with anti-seize compound. New sensors are already coated. Take care not to contaminate the oxygen sensor probe with the anti-seize compound.
  2.  
  3. Install the oxygen sensor into the exhaust manifold. Tighten the sensor, using the correct tool, to 33 ft. lbs. (45 Nm)
  4.  
  5. Attach the wiring to the sensor.
  6.  
  7. Carefully lower the vehicle.
  8.  
  9. Connect the negative battery cable.
  10.  

Testing



  1. Disconnect the Heated Oxygen Sensor connector and connect a test harness to the connector on the sensor side.
  2.  
  3. Start the engine and warm up the engine until engine coolant is 80°C (176°F) or higher.
    NOTE
    Be very careful when connecting the jumper wires; incorrect connection can damage the sensor.

  4.  
  5. Use the jumper wires to connect terminal 3 of the sensor connector to the positive battery terminal and terminal 4 to the negative battery terminal.
  6.  
  7. Connect a digital voltmeter between terminal 1 and terminal 2.
  8.  
  9. While repeatedly revving the engine, measure the sensor output voltage. Standard value: 0.6-1.0 V
  10.  
  11. If not within specifications, replace the sensor.
  12.  
  13. If within specifications, check connectors and wiring between the sensor and ECM/PCM.
  14.  

  1. Disconnect the Heated Oxygen Sensor connector and connect a test harness to the connector on the sensor side.
  2.  
  3. Start the engine and warm up the engine until engine coolant is 80°C (176°F) or higher.
    NOTE
    Be very careful when connecting the jumper wires; incorrect connection can damage the sensor.

  4.  
  5. Use the jumper wires to connect terminal 3 of the sensor connector to the positive battery terminal and terminal 4 to the negative battery terminal.
  6.  
  7. Connect a digital voltmeter between terminal 1 and terminal 2.
  8.  
  9. While repeatedly revving the engine, measure the sensor output voltage. Standard value: 0.6-1.0 V
  10.  
  11. If not within specifications, replace the sensor.
  12.  
  13. If within specifications, check connectors and wiring between the sensor and ECM/PCM.
  14.  

 
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