Pic. 7.14. Sensor Resistance Test (1) oxygen concentration
2. Check that the circuit between pin 3 and pin 4 of the oxygen sensor connector is closed (resistance between contacts is 7–40 ohms at 20°С) (pic. 7.14).
3. If the circuit is open, replace the oxygen concentration sensor.
4. Warm up the engine to coolant temperature (80°C or higher).
Pic. 7.15. Connecting type connectors «crocodile» (1) output «3» oxygen sensor connector «+» battery terminal, and output «4» To «–» battery terminal
5. With wire type connectors «crocodile» connect lead «3» oxygen concentration sensor connector «+» battery terminal, and the output «4» - To «–» battery terminal (pic. 7.15).
Attention! Be very careful when connecting wires with connectors such as «crocodile» to battery terminals (do not reverse the polarity). Incorrect wiring may damage the oxygen sensor.
6. Connect digital (electronic) voltmeter to terminals «1» And «2» sensor connector.
7. Periodically pressing the accelerator pedal, measure the output voltage of the oxygen concentration sensor. When you press the accelerator pedal, the output voltage of the oxygen sensor should be 0.6-1.0 V.
8. If the oxygen sensor is faulty, replace it.