Confirmation Driving Pattern

Fig 1: Confirmation Driving Pattern

(a) Connect the Techstream to the DLC3.
(b) Enter the following menus: Powertrain / Engine and ECT / Data List / O2S B1 S1 or O2S B2 S1.
(c) Start the engine and warm it up with all the accessories switched OFF until the ECT becomes stable.
(d) Run the engine at 2500 to 3000 RPM for about 3 minutes.
HINT:

Control the engine RPM so that the calculated catalyst temperature can be between 550 and 800°C (1022 and 1472°F). The calculated catalyst temperatures of bank 1 and bank 2 can be read by viewing Catalyst Temp (B1 S1) and Catalyst Temp (B2 S1) of the Data List.
(e) Confirm that heated oxygen sensor (bank 1 sensor 1 (OX1A) and bank 2 sensor 1 (OX2A)) have waveforms that are around 0.5 V during feedback to the ECM. Then check the waveform of the heated oxygen sensor (bank 1 sensor 2 (OX1B) and bank 2 sensor 2 (OX2B)) for the same waveforms (0.5 V during feedback).

Fig 2: Identifying Heated Oxygen Sensor Waveform
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HINT:

If there is a malfunction in the catalyst, the waveform of the heated oxygen sensor (sensor 2) (OX1B, OX2B) is almost the same as that of the heated oxygen sensor (sensor 1) (OX1A, OX2A), which is shown.