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