DTC P0300-00: Random Misfire Detected: Notes

DTC P0300:00 DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0300:00	Random misfire detected
DETECTION CONDITION	The PCM monitors the CKP sensor input signal interval time. The PCM calculates the change of interval time for each cylinder. If the change of interval time exceeds the preprogrammed criteria, the PCM detects a misfire in the corresponding cylinder. While the engine is running, the PCM counts the number of misfires that occurred at 200 crankshaft revolutions and 1, 000 crankshaft revolutions and calculates the misfire ratio for each crankshaft revolution. If the ratio exceeds the preprogrammed criteria, the PCM determines that a misfire, which can damage the catalytic converter or affect emission performance, has occurred. Diagnostic support note This is a continuous monitor (misfire). The check engine light illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. The check engine light flashes if the PCM detects the misfire which can damage the catalytic converter during first drive cycle. PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle. FREEZE FRAME DATA (Mode 2)/Snapshot data is available. The DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	The engine output is restricted depending on the condition.
POSSIBLE CAUSE	Erratic signal to PCM APP sensor signal malfunction ECT sensor signal malfunction IAT sensor signal malfunction MAF sensor signal malfunction CKP sensor signal malfunction TP sensor signal malfunction VSS signal malfunction Related connector or terminals malfunction Related wiring harness malfunction CMP sensor malfunction CKP sensor loose Ignition system malfunction Spark plug malfunction Ignition coil malfunction Ignition coil related wiring harness malfunction Excessive air suction in intake air system (between MAF sensor and intake manifold) MAF sensor malfunction Fuel supply system malfunction or improper fuel line pressure Fuel leakage in fuel line Restricted fuel line blockage Restricted fuel filter blockage Pressure regulator malfunction (built-into fuel pump unit) Fuel pump unit malfunction Fuel runout Improper operation of variable valve timing control system Fuel injector malfunction Purge solenoid valve malfunction Engine malfunction Insufficient engine compression Engine coolant leakage to combustion chamber EGR valve malfunction PCV valve malfunction Poor quality fuel PCM malfunction
SYSTEM WIRING DIAGRAM	-