Confirmation Driving Pattern
- Connect the hand-held tester to the DLC3.
- Start the engine and warm it up with all the accessories switched OFF until the ECT becomes stable.
- Run the engine at 2,500 to 3,000 rpm for about 3 minutes.
HINT:
Control the engine RPM so that the calculated catalyst temperature can be between 550 and 800°C (1,022 and 1,472°F). The calculated catalyst temperatures of bank 1 and bank 2 can be read by viewing CAT TEMP B1S1 and CAT TEMP B2S1 of the DATA LIST.
- Confirm that HO2S (bank 1 sensor 1 (OXL1) and bank 2 sensor 1 (OXR1)) have waveforms that are around 0.5 V during feedback to the ECM. Then check the waveform of HO2S (bank 1 sensor 2 (OXL2) and bank 2 sensor 2 (OXR2)) for the same waveforms (0.5 V during feedback).
HINT:
If there is a malfunction in the catalyst, the waveform of the HO2S (sensor 2) (OXL1, OXR1) is almost the same as that of the HO2S (sensor 1) (OXL2, OXR2), which is shown on Fig 2.
TESTER RANGE SPECIFICATIONSTester Range 0.2 V/DIV, 200 msec./DIV Condition Maintain engine RPM at 2,500 rpm after engine warmed-up