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.
•  The DTC is 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 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 FREEZE FRAME DATA (Mode 2)/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 the 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/OR DTC
•  Switch the ignition to off, then to ON (engine off).
•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
•  Are any other PENDING CODEs and/or DTCs present?
Yes
Go to the applicable PENDING CODE or 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:
―  APP1
―  APP2
―  ECT
―  IAT
―  MAF
―  RPM
―  TP REL
―  VSS
•  Is there any signal that is far out of specification when the ignition switch is ON and the engine idles?
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 TROUBLE CONDITION
•  Access the same PIDs as in Step 4 while simulating the FREEZE FRAME DATA (Mode 2) condition.
•  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.
•  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.
•  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
INSPECT INSTALLATION OF CKP SENSOR
•  Inspect if the CKP sensor is loosely installed.
•  Is the CKP sensor installed securely?
Yes
Go to the next step.
No
Retighten the CKP sensor, then go to Step 27.
(See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [L3 Turbo].)
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.
•  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.
•  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?
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
Note
•  Engine speed may change when rust penetrating agent is sprayed on the air suction area.
•  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.
•  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 PRESSURE (LOW-SIDE)
•  Connect the fuel pressure gauge between fuel pump and high pressure fuel pump.
•  Measure the low side fuel pressure.
•  Is the low side fuel pressure within the specification?
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.
14
INSPECT FUEL LINE FROM FUEL PUMP TO FUEL DELIVERY PIPE
•  Visually inspect the fuel line for fuel leakage.
•  Is there any leakage?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 27.
No
Inspect the fuel filters for 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.
Go to Step 27.
15
INSPECT VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION
•  Perform the Variable Valve Timing Control System Operation Inspection.
•  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
•  Switch the ignition to off.
•  Connect the vacuum pump to the purge solenoid valve and apply vacuum to the solenoid.
•  Verify that the solenoid holds vacuum.
•  Switch the ignition to ON (engine off).
•  Access the EVAPCP PID of simulation item using the M-MDS.
•  Set the duty value to 100% for the EVAPCP PID.
•  Apply the 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.
•  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”.
•  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.
•  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.
•  Is the FUEL_PRES PID value within the specification?
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.
•  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
•  Access the FUEL_PRES PID using the M-MDS.
•  Is the FUEL_PRES PID value within the specification?
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.
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.
•  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.
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.
•  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.
No
Go to the next step.
26
INSPECT PCV VALVE OPERATION
•  Switch the ignition to off.
•  Remove the PCV valve.
•  Inspect the PCV valve operation.
•  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.
•  Perform the Drive Mode 03 (EGR System, A/F sensor heater, HO2S heater, A/F sensor, HO2S and TWC Repair Verification Drive Mode).
•  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”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [L3 Turbo].)
No
DTC troubleshooting completed.