Detection Condition

PCM monitors Crankshaft Position (CKP) sensor input signal interval time. PCM detects a misfire in a specific cylinder by calculating change of CKP interval time for each cylinder. While engine is operating, PCM counts number of misfires that occur during 200 crankshaft revolutions and during 1000 crankshaft revolutions in order to calculate a misfire ratio for each crankshaft revolution. If misfire ratio exceeds a preprogrammed criteria, PCM determines that a misfire has occurred which can damage catalytic converter or affect emission performance and will set a DTC. This is a Continuous Monitor (CM). MIL illuminates if PCM detects misfire which affects emission performance in 2 consecutive drive cycles. Pending code is available if PCM detects misfire which affects emission performance. MIL flashes if PCM detects misfire which can damage catalytic converter during first drive cycle. Therefore, pending code is not available while MIL flashes. Freeze Frame Data is available and DTC is stored in PCM memory.