Contents: Removal ↧ Installation ↧
Three-way catalytic converters are used to control hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOx) in the exhaust. The catalytic agent in the catalytic converter causes a chemical reaction. This reaction oxidizes the HC and CO in the exhaust and converts them into harmless water vapor and carbon dioxide. The catalytic converter and the catalytic converter reduce NOx by converting it into nitrogen. The ECM can monitor this process using an oxygen sensor (O2S). The sensor produces an output signal that is an indication of the amount of oxygen in the incoming exhaust stream. This is an indication of the ability of the catalytic converter to convert the exhaust gases. The catalytic converter sensor works on the same principle as the fuel management sensors. The main purpose of the sensor is to monitor the catalytic converter process, but its role in fuel management is limited. If the sensor output indicates a voltage above or below 450 mV bias voltage for an extended period of time, the ECM will smoothly adjust the fuel trim to ensure adequate fuel delivery to monitor the catalysis process.
Removal
Caution: The oxygen sensor uses a permanently attached electrode and connector. This electrode cannot be removed from the oxygen sensor. Damage to or removal of the electrode or connector may impair the performance of the oxygen sensor. Be careful when handling the oxygen sensor. Do not drop it.
1. Disconnect the "-" battery cable.
2. Remove the oxygen sensor (O2S) connector.
Note: If the engine temperature is below 48°C, it may be difficult to remove the oxygen sensor. Excessive force may result in stripping the threads in the exhaust manifold.
3. Carefully remove the oxygen sensor (O2S).
Installation
Note: The threads of the oxygen sensor are coated with a special anti-stick compound. This compound consists of liquid graphite and glass granules. The graphite will burn off later, but the glass granules will remain, which will make it easier to remove the sensor. A new or repaired sensor will have this compound on the threads. If the sensor is removed from the engine or there is a need to reinstall it, a layer of anti-stick compound must be applied before reinstallation.
1. Coat the oxygen sensor threads with non-stick compound if necessary.
2. Install the oxygen sensor (O2S) and tighten to 42 Nm.
3. Connect the oxygen sensor.
4. Connect the "-" wire of the battery.
(The article was reprinted from the website: «CHEVYMAN.ru»)