DTC P0301:00, P0302:00, P0303:00, P0304:00 [LF, L5]

id0102c8703300

DTC P0301:00

Cylinder No.1 misfire detected

DTC P0302:00

Cylinder No.2 misfire detected

DTC P0303:00

Cylinder No.3 misfire detected

DTC P0304:00

Cylinder No.4 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 the 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 the 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 the misfire which can damage the catalytic converter during first drive cycle.
•  PENDING CODE is available if the PCM detects the misfire which affects emission performance during 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
•  Ignition system malfunction
―  Spark plug malfunction
―  Ignition coil related wiring harness malfunction
―  Ignition coil malfunction
•  Excessive air suction in intake air system (between dynamic chamber and cylinder head)
•  Erratic signal to fuel injector
•  Base engine malfunction
―  Leakage engine coolant to combustion chamber
―  Insufficient engine compression
•  Fuel injector malfunction
•  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, 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
•  Switch the ignition to off, then to ON (engine off).
•  Perform the DTC Reading Procedure and Pending Trouble Code Access Procedure.
•  Are any other DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [LF, L5].)
No
Go to the next step.
4
VERIFY CURRENT INPUT SIGNAL STATUS
•  Connect the M-MDS to the DLC-2.
•  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 switch the ignition to ON and the engine idles?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 14.
No
Go to the next step.
5
VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA (MODE 2) CONDITION
•  Connect the M-MDS to the DLC-2.
•  Access the following PIDs under FREEZE FRAME DATA (Mode 2) condition.
―  APP1
―  APP2
―  ECT
―  IAT
―  MAF
―  RPM
―  TP REL
―  VSS
•  Is there any signal which causes drastic changes?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 14.
No
Go to the next step.
6
INSPECT WHETHER MALFUNCTION IS IN IGNITION SYSTEM OR ELSEWHERE
•  Carry out the spark test.
•  Is strong blue spark visible at each cylinder?
Yes
Go to Step 9.
No
Go to the next step.
7
INSPECT SPARK PLUG
•  Remove the suspected spark plug.
•  Inspect the suspected spark plug.
•  Is there any malfunction?
Yes
Replace the suspected spark plug, then go to Step 14.
(See SPARK PLUG REMOVAL/INSTALLATION [LF, L5].)
No
Go to the next step.
8
INSPECT IGNITION COIL
•  Inspect the ignition coil for all cylinders.
•  Is there any malfunction?
Yes
Replace the suspected ignition coil, then go to Step 14.
(See IGNITION COIL REMOVAL/INSTALLATION [LF, L5].)
No
Inspect the suspected cylinder ignition coil related wiring harnesses.
•  Repair or replace the wiring harness if necessary, then go to Step 14.
9
INSPECT INTAKE AIR SYSTEM FOR AIR SUCTION
•  Inspect for air leakage at the following:
―  Around connection of dynamic chamber and intake manifold
―  Around connection of intake manifold and cylinder head
Note
•  Engine speed may change when rust penetrating agent is sprayed on the air suction area.
•  Is there any leakage?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 14.
No
Go to the next step.
10
INSPECT FUEL INJECTOR WIRING HARNESS
•  Remove the intake air system parts.
•  Disconnect the fuel injector connector on suspected cylinder.
•  Connect the NOID LIGHT to fuel injector terminals.
•  Inspect dim of light during cranking.
•  Does the light illuminate?
Yes
Go to the next step.
No
Inspect the fuel injector wiring harnesses.
•  Repair or replace the wiring harness if necessary, then go to Step 14.
11
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 14.
No
Go to the next step.
12
INSPECT ENGINE COMPRESSION
•  Inspect the engine compression.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning parts according to the inspection results, then go to Step 14.
No
Go to the next step.
13
INSPECT FUEL INJECTOR OPERATION
•  Remove the fuel injector.
•  Switch the fuel injector with the fuel injector on other cylinder.
•  Start the engine and idle it.
•  Is the misfire DTC for cylinder which has a suspected fuel injector?
Yes
Replace the suspected fuel injector, then go to the next step.
(See FUEL INJECTOR REMOVAL/INSTALLATION [LF, L5].)
No
Go to the next step.
14
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine and warm it up completely.
•  Perform the Pending Trouble Code Access Procedure.
•  Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [LF, L5].)
No
Go to the next step.
15
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [LF, L5].)
No
DTC troubleshooting completed.