Circuit Description
WARNING: This page is about a different car, the 2003 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.
Misfire: The ECM uses the crankshaft position sensor and camshaft position sensor to monitor changes in the crankshaft rotation of each cylinder. The ECM counts the number of times the engine speed changed rate that the misfire has occurred. And when the misfire rate equals to or exceeds the count of indicating that the engine condition has deteriorated, the MIL lights up. If the misfire rate is high enough and the driving conditions will cause the catalyst to overheat, the MIL blinks when misfiring occurs.
Detecting condition of DTC P0300 is when there is misfiring of random cylinders is detected during any particular 200 or 1000 revolutions. Detecting conditions of DTC P0301-P0304 are:
- For any particular 200 revolutions of engine, misfiring is detected which can cause catalyst to overheat (this causes MIL to blink).
- For any particular 1000 revolutions of engine, misfire is detected which causes a deterioration in emission (2 trip detection logic).