DTC P0300, DTC P0301, DTC P0302, DTC P0303, DTC P0304, DTC P0305 &/Or DTC P0306: Condition

WARNING: This page is about a different car, the 2002 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.

ECM (PCM) monitors Crankshaft Position (CKP) sensor input signal interval time. It detects a misfire in a specific cylinder by calculating change of CKP interval time for each cylinder. While engine is operating, ECM (PCM) counts number of misfires that occurred 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 during 200 crankshaft revolutions, ECM (PCM) determines that a misfire has occurred which can damage the catalytic converter, will set a DTC and will flash MIL. If misfire ratio exceeds a preprogrammed criteria during 1000 crankshaft revolutions, ECM (PCM) will set a DTC and illuminate MIL when it detects malfunction during 2 consecutive drive cycles. Possible causes are:

Secondary ignition system malfunction.
Plugged or leaking fuel injector.
Incorrect fuel pressure.
EGR system malfunction.
Fuel level sensor malfunction.
Intake system vacuum leaks.
Incorrect engine compression.
Incorrect valve clearance.
Incorrect valve timing.
Low fuel level.