DTC    P0300    Random / Multiple Cylinder Misfire Detected

DESCRIPTION

WIRING DIAGRAM

CONFIRMATION DRIVING PATTERN

INSPECTION PROCEDURE

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

CHECK PCV HOSE (HOSE CONNECTIONS)

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

READ VALUE USING INTELLIGENT TESTER (CYLINDER #1 MISFIRE COUNT, #2, #3 AND #4)

INSPECT SPARK PLUG

CHECK FOR SPARK (SPARK TEST)

CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE)

CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30 AND/OR #40 VOLTAGE)

CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER

CHECK INTAKE SYSTEM

INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

CHECK FUEL PRESSURE

READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)

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

REPLACE ECM

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

CHECK INTAKE SYSTEM

INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

CHECK FUEL PRESSURE

READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)

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

INSPECT EGR VALVE ASSEMBLY

INSPECT SPARK PLUG

CHECK FOR SPARK (SPARK TEST)

CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE)

CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY- ECM)

INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30 AND/OR #40 VOLTAGE)

CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER

ADJUST VALVE TIMING

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

REPLACE ECM

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 AND CHECK SPARK OF MISFIRING CYLINDER

CHECK FUEL LINE