DTC P0300-P0308 Detection Logic
On DTC P0300-P0308, MIL is set in 2 stages. If the ECM detects misfiring, strong enough to cause catalytic converter overheating, for any 200 revolutions of the engine, MIL will blink, but will not stay illuminated. If the ECM detects misfiring, strong enough to cause deterioration of catalytic converter, during 2 consecutive drive cycles, for any 1000 revolutions of the engine, MIL will illuminate.
NOTE:
When road testing vehicle in CHECK mode (Lexus scan tool only), the Two Trip Detection Logic will not function. Also, MIL will illuminate first time a malfunction is detected.