DTC P0300:00 [L3 Turbo]SM2444100
DTC P0300:00 [L3 Turbo]

id0102b7703200

DTC P0300:00

Random misfire detected
DETECTION CONDITION
• The PCM monitors the CKP sensor input signal interval time. The PCM calculates the change of interval time for each cylinder. If the change of interval time exceeds the preprogrammed criteria, the PCM detects a misfire in the corresponding cylinder. While the engine is running, the PCM counts the number of misfires that occurred at 200 crankshaft revolutions and 1,000 crankshaft revolutions and calculates a misfire ratio for each crankshaft revolution. If the ratio exceeds the preprogrammed criteria, the PCM determines that a misfire, which can damage the catalytic converter or affect emission performance, has occurred.
Diagnostic support note
• This is a continuous monitor (misfire).
• The MIL illuminates if the PCM detects a misfire which affects emission performance in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
• The MIL flashes if the PCM detects a misfire which can damage the catalytic converter during the first drive cycle.
• PENDING CODE is available if the PCM detects a misfire which affects emission performance during the first drive cycle.
• FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
• DTCs are stored in the PCM memory.
POSSIBLE CAUSE
• Erratic signal to PCM
― APP sensor signal malfunction
― ECT sensor signal malfunction
― IAT sensor signal malfunction
― MAF sensor signal malfunction
― CKP sensor signal malfunction
― TP sensor signal malfunction
― VSS signal malfunction
― Related connector or terminals malfunction
― Related wiring harness malfunction
• CMP sensor malfunction
• CKP sensor looseness
• Ignition coil related wiring harness malfunction
• Ignition system malfunction
― Spark plug malfunction
― Ignition coil malfunction
• Air restriction or leakage in intake air system (between MAF sensor and intake manifold)
• MAF sensor contamination
• Turbocharger malfunction (turbine wheel/compressor wheel damaged, stuck)
• Low-pressure side fuel delivery system malfunction
― Fuel pump unit malfunction
― Fuel pressure regulator (built-in fuel pump unit) malfunction
― Fuel line clogged
― Fuel filter clogged
― Fuel leakage in fuel line
― Fuel runout
• Improper operation of variable valve timing control system
• Purge control solenoid valve malfunction
• Vacuum hoses damage or improper connection
• Improper operation of fuel pump speed control
• Engine internal malfunction
― Leakage engine coolant to combustion chamber
― Insufficient engine compression
• High-pressure side fuel delivery system malfunction
― Fuel pressure sensor (built-in fuel delivery pipe) malfunction
― Relief valve (built-in fuel delivery pipe) malfunction
― High pressure fuel pump malfunction
― Spill valve control solenoid valve (built-in high pressure fuel pump) malfunction
• EGR valve malfunction
• PCV valve malfunction
• Poor quality fuel
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
• Have the snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (misfire related) been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Verify related Service Information availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
VERIFY RELATED PENDING CODE AND STORED DTC
• Turn the ignition switch off, then to the ON position (engine off).
• Perform the DTC Reading Procedure and Pending Trouble Code Access Procedure. (See ON-BOARD DIAGNOSTIC TEST [L3 Turbo].)
• Are any other DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [L3 Turbo].)
No
Go to the next step.
4
VERIFY CURRENT INPUT SIGNAL STATUS (KEY TO ON/IDLE)
• Access the following PIDs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [L3 Turbo].)
― APP1
― APP2
― ECT
― IAT
― MAF
― RPM
― TP REL
― VSS
• Is there any signal that is far out of specification when the ignition switch is turned to the ON position and the engine idles? (See PCM INSPECTION [L3 Turbo].)
Yes
Inspect the suspected circuit.
• If the inspection results are normal:
― Go to the next step.
• If the inspection results are not normal:
― Repair or replace the malfunctioning part according to the inspection results, then go to Step 27.
No
Go to the next step.
5
VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA (MODE 2) CONDITION
• Access the same PIDs as in Step 4 while simulating the FREEZE FRAME DATA (Mode 2) condition. (See ON-BOARD DIAGNOSTIC TEST [L3 Turbo].)
• Is there any signal which causes drastic changes?
Yes
Inspect the suspected circuit.
• If the inspection results are normal:
― Go to the next step.
• If the inspection results are not normal:
― Repair or replace the malfunctioning part according to the inspection results, then go to Step 27.
No
Go to the next step.
6
INSPECT CMP SENSOR
• Inspect the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION [L3 Turbo].)
• Is there any malfunction?
Yes
Inspect the installation condition for damage to the timing chain and gears.
• If there is no malfunction:
― Replace the CMP sensor. (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [L3 Turbo].)
• If there is any malfunction:
― Repair or replace the malfunctioning part according to the inspection results.
Go to Step 27.
No
Go to the next step.
7
VERIFY CKP SENSOR INSTALLATION CONDITION
• Inspect the CKP sensor for looseness.
• Is there any malfunction?
Yes
Retighten the CKP sensor, then go to Step 27.
(See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [L3 Turbo].)
No
Go to the next step.
8
INSPECT IGNITION COIL HARNESSES
• Inspect the ignition coil related wiring harness condition (intermittent open or short) for all cylinders.
• Is there any malfunction?
Yes
Repair or replace the suspected wiring harnesses, then go to Step 27.
No
Go to the next step.
9
INSPECT IGNITION SYSTEM OPERATION
• Perform the Spark Test. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].)
• Is a strong blue spark visible at each cylinder?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the spark test result, then go to Step 27.
10
INSPECT MAF PID
• Start the engine.
• Access the MAF PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [L3 Turbo].)
• Race the engine and verify that the MAF PID changes quickly according to the change in the engine speed.
• Is the MAF PID value normal? (See PCM INSPECTION [L3 Turbo].)
Yes
Go to Step 13.
No
Go to the next step.
11
INSPECT IN INTAKE AIR SYSTEM FOR RESTRICTION OR LEAKAGE
• Inspect for air leakage at the following:
― Between MAF sensor and throttle body
― Between throttle body and intake manifold
• Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 27.
No
Go to the next step.
12
INSPECT TURBOCHARGER
• Inspect the turbocharger. (See TURBOCHARGER INSPECTION [L3 Turbo].)
• Is there any malfunction?
Yes
Replace the turbocharger, then go to Step 27.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L3 Turbo].)
No
Replace the MAF/IAT sensor, then go to Step 27.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [L3 Turbo].)
13
INSPECT FUEL LINE PRESSURE
• Inspect the fuel line pressure. (See FUEL LINE PRESSURE INSPECTION [L3 Turbo].)
• Is the fuel line pressure normal?
Yes
Go to Step 15.
No
If the fuel line pressure is too low:
• Go to the next step.
If the fuel line pressure is too high:
• Replace the fuel pump unit, then go to Step 27. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L3 Turbo].)
14
INSPECT FUEL LINE FROM FUEL PUMP TO FUEL DELIVERY PIPE
• Visually inspect the fuel line for fuel leakage.
• Is there fuel leakage?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 27.
No
Inspect the fuel filters for following:
• Foreign material or stain inside fuel filter (low-pressure side)
Perform the following actions depend on the result above.
• If foreign materials or stain is found inside fuel filter (low-pressure side):
― Clean the fuel tank and filter (low-pressure side).
• If normal:
― Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L3 Turbo].)
Go to Step 27.
15
INSPECT VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION
• Perform the Variable Valve Timing Control System Operation Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].)
• Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 27.
No
Go to the next step.
16
INSPECT OPERATION OF PURGE CONTROL SOLENOID VALVE
• Turn the ignition switch off.
• Connect the vacuum pump to the purge control solenoid valve and apply vacuum to the solenoid.
• Verify that the solenoid holds vacuum.
• Turn the ignition switch to the ON position (engine off).
• Access the EVAPCP PID of simulation item using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [L3 Turbo].)
• Set duty value to 100% for the EVAPCP PID.
• Apply vacuum while turning the solenoid from OFF to ON and simulating the EVAPCP PID with a 100% duty value.
• Verify that the solenoid releases vacuum while the solenoid is turned on.
• Is the purge control solenoid valve operation normal?
Yes
Go to the next step.
No
Replace the purge solenoid valve, then go to Step 27.
(See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [L3 Turbo].)
17
VERIFY FUEL PUMP SPEED CONTROL OPERATION
• Perform the Fuel Pump Speed Control Inspection. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].)
• Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 27.
No
Go to the next step.
18
INSPECT SEALING OF ENGINE COOLANT PASSAGE
• Perform the “ENGINE COOLANT LEAKAGE INSPECTION”. (See ENGINE COOLANT LEAKAGE INSPECTION [L3 Turbo].)
• Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 27.
No
Go to the next step.
19
INSPECT ENGINE COMPRESSION
• Inspect the engine compression. (See COMPRESSION INSPECTION [L3 Turbo].)
• Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 27.
No
Go to the next step.
20
INSPECT FUEL PRESSURE (HIGH-SIDE)
• Access the FUEL_PRES PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [L3 Turbo].)
• Is the FUEL_PRES PID value within the specification? (See PCM INSPECTION [L3 Turbo].)
Yes
Go to Step 25.
No
Go to the next step.
21
IDENTIFY CAUSE BY FUEL PRESSURE SENSOR OR HIGH PRESSURE FUEL PUMP
• Is the vehicle accelerate performance normally?
Yes
Go to the next step.
No
Go to Step 24.
22
INSPECT FUEL PRESSURE SENSOR
• Inspect the fuel pressure sensor. (See FUEL PRESSURE SENSOR INSPECTION [L3 Turbo].)
• Is there any malfunction?
Yes
Replace the fuel delivery pipe, then go to Step 27.
(See FUEL INJECTOR REMOVAL/INSTALLATION [L3 Turbo].)
No
Go to the next step.
23
INSPECT HIGH PRESSURE FUEL PUMP
• Replace the high pressure fuel pump (See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [L3 Turbo].)
• Access the FUEL_PRES PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [L3 Turbo].)
• Is the FUEL_PRES PID value within the specification? (See PCM INSPECTION [L3 Turbo].)
Yes
High-pressure fuel pump or spill valve control solenoid valve (built-in high pressure fuel pump) malfunction.
• Go to Step 27.
No
Relief valve malfunction.
• Replace the fuel delivery pipe, then go to Step 27. (See FUEL INJECTOR REMOVAL/INSTALLATION [L3 Turbo].)
24
INSPECT FUEL PRESSURE (LOW-SIDE)
• Connect the fuel pressure gauge between fuel pump and high pressure fuel pump.
• Measure the low side fuel pressure. (See FUEL LINE PRESSURE INSPECTION [L3 Turbo].)
• Is the low side fuel pressure within the specification?
Yes
Go to the next step.
No
Inspect for the following.
• Fuel line restriction
• Fuel filter clogging
― If there is no malfunction:
• Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [L3 Turbo].)
― If there is any malfunction:
• Repair or replace the malfunctioning part according to the inspection results.
Go to Step 27.
25
INSPECT EGR VALVE OPERATION
• Remove the EGR valve. (See EGR VALVE REMOVAL/INSTALLATION [L3 Turbo].)
• Visually inspect if the EGR valve is stuck open.
• Is the EGR valve stuck open?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 27.
(See EGR VALVE REMOVAL/INSTALLATION [L3 Turbo].)
No
Go to the next step.
26
INSPECT PCV VALVE OPERATION
• Turn the ignition switch off.
• Remove the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L3 Turbo].)
• Inspect the PCV valve operation. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [L3 Turbo].)
• Is there any malfunction?
Yes
Replace the PCV valve, then go to the next step.
(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [L3 Turbo].)
No
Go to the next step.
27
VERIFY DTC TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the M-MDS. (See AFTER REPAIR PROCEDURE [L3 Turbo].)
• Perform the KOER self test. (See KOEO/KOER SELF TEST [L3 Turbo].)
• Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [L3 Turbo].)
No
Go to the next step.
28
VERIFY AFTER REPAIR PROCEDURE
• Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L3 Turbo].)
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [L3 Turbo].)
No
DTC troubleshooting completed.