DTC    P0300    Random / Multiple Cylinder Misfire Detected

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE DTCS)

CHECK PCV HOSE CONNECTIONS

READ VALUE USING INTELLIGENT TESTER (MISFIRE RPM AND MISFIRE LOAD)

READ VALUE USING INTELLIGENT TESTER (CYLINDER #1 (TO #4) MISFIRE COUNT)

INSPECT SPARK PLUG

CHECK FOR SPARKS AND IGNITION

CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE VOLTAGE)

CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER

CHECK INTAKE SYSTEM

CHECK FUEL PRESSURE

READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)

READ VALUE USING INTELLIGENT TESTER (MAF)

ADJUST VALVE TIMING

CHECK WHETHER DTC OUTPUT RECURS (P0300, P0301, P0302, P0303 OR P0304)

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION)

INSPECT EGR VALVE ASSEMBLY

CHECK INTAKE SYSTEM

CHECK FUEL PRESSURE

READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)

READ VALUE USING INTELLIGENT TESTER (MAF)

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION)

INSPECT EGR VALVE ASSEMBLY

INSPECT SPARK PLUG

CHECK FOR SPARKS AND IGNITION

CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE VOLTAGE)

CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER

ADJUST VALVE TIMING

CHECK WHETHER DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 OR P0304)

CHECK HARNESS AND CONNECTOR

CHECK DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 OR P0304)

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

CHANGE TO KNOWN GOOD SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER

CHANGE TO KNOWN GOOD IGNITION COIL ASSEMBLY AND CHECK SPARK OF MISFIRING CYLINDER

CHECK FUEL LINE