Confirmation Driving Pattern
- If using a hand-held tester: Connect the hand-held tester to the DLC3.
- If not using a hand-held tester: Connect oscilloscope tester probes to terminals OXL1 (front Heated Oxygen [HO2] sensor: Sensor 1), OXL2 (rear HO2 sensor: Sensor 2) and E1 of the ECM connector.
- Start the engine.
- Warm up the engine with all the accessories switched OFF until the engine coolant temperature stabilizes.
- Run the engine at an engine speed of between 2,500 rpm and 3,000 rpm for approximately 3 minutes.
- Check that the waveform of the OXL2 (rear HO2 sensor) signal.
HINT:
If there is still a malfunction in the system, the waveform of OX1B may become similar to the OXL1 waveform shown in the diagram on the left.