CHECK OTHER DTC OUTPUT (IN ADDITION TO MISFIRE DTCS)
READ VALUE OF DATA LIST (MISFIRE RPM, MISFIRE LOAD)
CHECK MISFIRE COUNT (CYL #1, #2, #3, #4)
CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER
CHANGE NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER
INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30, #40 VOLTAGE)
CHECK HARNESS AND CONNECTOR (INJECTOR - ECM)
CHECK FUEL INJECTOR OF MISFIRING CYLINDER