Fig. 7.14. Checking the resistance of the oxygen concentration sensor (1)
2. Check that the circuit between contact 3 and contact 4 of the oxygen sensor connector is closed (resistance between contacts is 7–40 Ohm at 20°C) (Fig. 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).
Fig. 7.15. Connecting the oxygen sensor connector terminal "3" to the "+" terminal of the battery using alligator clips (1), and terminal "4" to the "–" terminal of the battery
5. Using wires with alligator clip connectors, connect terminal "3" of the oxygen concentration sensor connector to the "+" terminal of the battery, and terminal "4" to the "–" terminal of the battery (Fig. 7.15).
Caution! Be very careful when connecting the wires with alligator clips to the battery terminals (do not reverse the polarity). Incorrect connection of the wires may damage the oxygen sensor.
6. Connect a digital (electronic) voltmeter to terminals "1" and "2" of the sensor connector.
(The material was borrowed from the website: «www.MitsubishiMan.ru»)
7. Measure the output voltage of the oxygen concentration sensor by periodically pressing the accelerator pedal. When pressing 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.