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
- Disconnect the electrical connector from the sensor.
- Remove the oxygen sensor.
Installation is the reverse of the removal procedure.
NOTEApply anti-seize compound to the threaded portion of the sensor, prior to installation. Never apply anti-seize compound to the protector of the sensor.
Perform a visual inspection of the sensor as follows:
- If the sensor tip has a black/sooty deposit, this may indicate a rich fuel mixture.
- If the sensor tip has a white, gritty deposit, this may indicate an internal coolant leak.
- If the sensor tip has a brown deposit, this could indicate excessive oil consumption.
- Warm the engine until the coolant temperature reaches operating temperature.
- Disconnect the sensor electrical connector, and using a DVOM mete, measure the resistance between terminal 3 and 4.
- Specification should be 30 ohms, or more.
- Replace the sensor, if there is a malfunction.
Apply battery voltage directly between terminal 3 and 4.
NOTEBe careful when applying the voltage. Damage will result if terminals 1 and 2 are connected to any voltage.
- Connect a voltmeter between terminal 1 and 2.
- While racing the engine repeatedly, measure the output voltage.
- Specification should be 0.6 volt (minimum) and resistance should be 30 ohm or more.
- Replace the sensor, as required.