Except California

CONFIRMATION ENGINE RACING PATTERN
1. Connect the TOYOTA hand-held tester DLC 3, or connect the probe of the oscilloscope between terminals OX1, OX2 and E1 of ECM.
2. Start the engine and warm it up with all accessories switched OFF until engine coolant temperature is stable.
3. Race the engine at 2,500 - 3,000 rpm for about 3 mm.
4. After confirming that the wave form of the heated oxygen sensor (bank 1 sensor 1 (OX1)), oscillate around 0.5 V during feedback to the ECM, check the wave form of the heated oxygen sensor (bank 1 sensor 2 (OX2)).






HINT: If there is a malfunction in the system, the wave form of the heated oxygen sensor (bank 1 sensor 2 (OX2)) is almost the same as that of the heated oxygen sensor (bank 1 sensor 1 (OX1)) on the left.
There are some cases where, even though a malfunction exists, the MIL may either light up or not light up.