Models with a carburetor engine
Examination
1. Adjust the composition of the fuel mixture for idling (CO level) (see subsection 2.2.2).
2. Remove the fuse box cover to gain access to the diagnostic connector, which is located on the bottom of the fuse box.
3. Set the tester to measure voltage and connect its probes to the control connector of the fuse block as shown in the figure.
4. Start the engine, raise the engine speed to about 2000 rpm and hold it at this level for about 2 minutes, watching the tester dial. If the exhaust gas sensor is working properly, then the tester reading should change from 0 volts to about 12 volts at least 5 times every 10 seconds. If not, the sensor is probably bad. For a more detailed check of the sensor and catalytic converter, contact a specialist.
Fuel injected models
Examination
If the level of CO in the exhaust gases is too high, the operation of the exhaust gas sensor must be checked by turning on the engine electronic control unit in self-diagnosis mode (see subsection 6.2.11).
For a more detailed check of the sensor and catalytic converter, contact a specialist.
Exhaust gas sensor
Attention! The exhaust gas sensor is very fragile and will fail if it is struck or dropped, if the power is turned off while it is in operation, or if it comes into contact with any cleaning agents.
Replacement
1. On models with a 1.6 liter engine, walk along the wires from the exhaust gas sensor, which is screwed into the exhaust manifold. Disconnect the connection connector and remove the wires from all mounting clips.
2. On models with a 2.0 liter engine, apply the handbrake, raise the front of the vehicle and support it on stands. Walk along the wires from the exhaust gas sensor (which is screwed into the intake pipe), removing the wires from all mounting clips.
3. Disconnect the connector.
4. Unscrew the sensor and remove it together with the sealing washer.
5. Installation is carried out in the reverse order of removal. When installing, use a new sealing washer. Lubricate the threads of the sensor with high temperature grease before installing the sensor. Screw the sensor securely. Check that the wires are routed correctly and do not touch the exhaust pipes or the engine.