Lean mixture sensor switching circuit: 1 - lean mixture sensor, 2 - to the main relay of the ignition system, 3 - diagnostic connector, 4 - electronic control unit
1. Warm up the engine to normal operating temperature.
2. Measure the sensor feedback voltage.
- Connect the positive lead of the voltmeter to the "VF1" diagnostic connector, and the negative terminal) - to the conclusion "E1".
- Then run the following test:
3. Measure the heater resistance of the lean mixture sensor by connecting an ohmmeter to the terminals "+V" And "NT".
Rated resistance (at t = 20°C): 1.10-1.44 ohm.
If the resistance value is out of range, replace the sensor.