Diagnostic Aids
WARNING: This page is about a different car, the 2003 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
Using scan tool, read freeze frame data. Freeze frame records engine conditions when malfunction is detected. Perform confirmation engine racing pattern by connecting OBD-II scan tool or hand-held tester to the DLC3. Start engine and warm it up with all the accessories switched OFF until the water temperature is stable. Race the engine at 2500-3000 RPM for about 3 minutes. When racing the engine at 3000 RPM for 2 seconds and 2000 RPM for 2 seconds alternately, check waveform of the heated oxygen sensor (bank 1 sensor 2). See Fig 1.