Confirmation Driving Pattern

Fig 1: Confirmation Driving Pattern

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1. Connect the hand-held tester to the DLC3, or connect the probe of the oscilloscope between terminals OX1A, OX1B and E1 of the ECM connector.
2. Start the engine and warm it up with all the accessories switched OFF until the engine coolant temperature becomes stable.
3. Run the engine at 2,500 to 3,000 rpm for about 3 minutes.
4. After confirming that the waveform of the bank 1 sensor 1 (OX) which oscillates between 0 V and 1 V under a feedback to the ECM, check the waveform of the bank 1 sensor 2 (OX).

HINT:

If there is malfunction in the system, the waveform of "sensor 2" (OXL2) may become a similar to the one of "sensor1" (OXL1) shown in the diagram on the left.

Fig 2: OX Signal Waveform

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