Warning! The sensor is located near the catalytic converter, which gets hot when the engine is running. To avoid burns, the oxygen concentration sensor is checked and removed after the engine has cooled to a safe temperature. Before starting work, read the precautions for repairing the engine management system (see "Precautions when repairing the engine management system").
To complete the work you will need:
- multimeter (in voltmeter mode);
- viewing hole or flyover (for engines 2111 and 2112).
Examination
1. We prepare the car for work (see "Preparing the car for maintenance and repair"). Cars with engines 2111 and 2112 install on a viewing hole or overpass (see "Preparing the car for maintenance and repair").
2. Disconnect the wiring harness connector from the oxygen concentration sensor connector.
3. Connect "negative" voltmeter probe to "mass" engine. Turning on the ignition, check the supply voltage of the heating element at terminal B (the designation of the conclusions is applied on the block of the wiring harness).
Comment. The voltage at the output must be at least 12 V. If the voltage is not supplied to the block or it is less than 12 V, then the battery is discharged, the power circuit is faulty or the computer is faulty.
4. Connecting "negative" voltmeter probe to terminal C, measure the voltage between terminals A and C.
Comment. The voltage at the terminals should be 0.45 V. If the voltage does not enter the block or it differs by more than 0.02 V, then the power circuit is faulty or the computer is faulty.
Removing
1. We release the wire holder of the oxygen concentration sensor.
2. Key at 22 mm:
- on engines 21114 and 21124 unscrew the sensor from the exhaust manifold and remove the sensor (shown with intake manifold removed);
- on engines 2111 and 2112 unscrew the sensor from the intake pipe and remove it.
Advice. You can verify that the sensor is faulty by replacing it with a known good one.
Installation
Install the sensor in reverse order.