Conditioning A/F Sensor And Heated Oxygen Sensor For Testing

Fig 1: A/F Sensor And Heated Oxygen Sensor Graph

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1. Connect the hand-held tester or OBD II scan tool to the DLC3.
2. Start the engine and warm it up with all the accessories switched OFF until the Engine Coolant Temperature (ECT) is stable.
3. Run the engine at 2,500 to 3,000 RPM for about 3 minutes.
4. When alternating the engine between 3,000 RPM for 2 seconds and 2,000 RPM for 2 seconds, check the waveform of the oxygen sensor (bank 1 sensor 2).