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
- Detach the negative battery cable.
- Raise and safely support the vehicle.
- Detach the electrical connector from the oxygen sensor.
- Using socket MD998770, or equivalent oxygen sensor socket, remove the oxygen sensor.
- 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.
- Install the oxygen sensor into the exhaust manifold. Tighten the sensor, using the correct tool, to 33 ft. lbs. (45 Nm)
- Attach the wiring to the sensor.
- Carefully lower the vehicle.
- Connect the negative battery cable.
- Disconnect the Heated Oxygen Sensor connector and connect a test harness to the connector on the sensor side.
Start the engine and warm up the engine until engine coolant is 80°C (176°F) or higher.
NOTEBe very careful when connecting the jumper wires; incorrect connection can damage the sensor.
- 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.
- Connect a digital voltmeter between terminal 1 and terminal 2.
- While repeatedly revving the engine, measure the sensor output voltage. Standard value: 0.6-1.0 V
- If not within specifications, replace the sensor.
- If within specifications, check connectors and wiring between the sensor and ECM/PCM.