DTC    P0300    Random / Multiple Cylinder Misfire Detected

DESCRIPTION

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

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 SPARKS (SPARK TEST)

CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

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

INSPECT 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)

CHECK VALVE TIMING

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)

CHECK VALVE TIMING

READ VALUE USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION)

INSPECT EGR VALVE ASSEMBLY

INSPECT SPARK PLUG

CHECK FOR SPARKS (SPARK TEST)

CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

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

INSPECT FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER CONNECTOR CONNECTION)

CHECK WHETHER DTC OUTPUT RECURS

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

REPLACE MASS AIR FLOW METER

CHECK WHETHER DTC OUTPUT RECURS

CHANGE TO NORMALLY FUNCTIONING SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER

CHANGE TO NORMALLY FUNCTIONING IGNITION COIL AND CHECK SPARK OF MISFIRING CYLINDER

CHECK FUEL LINE