Confirmation Driving Pattern
- Connect the hand-held tester to the DLC3, or connect the tester probes of the oscilloscope between terminals OX1A, OX1B and E1 of the ECM connector.
- Start the engine and warm it up with all the accessories switched OFF until the engine coolant temperature becomes stable.
- Run the engine at 2,500 to 3,000 RPM for about 3 minutes.
- After confirming that the waveform of the bank 1 sensor 1 (OX1A) which oscillates between 0 V and 1 V under a feedback to the ECM, check the waveform of the bank 1 sensor 2 (OX2A).NOTE:
If there is malfunction in the system, the waveform of "sensor 2" (OX2A) may become a similar to the one of "sensor 1" (OX1A) as shown in the diagram on the left.