DTC P0301:00, P0302:00, P0303:00, P0304:00 [MZR 1.3, MZR 1.5]

id0102f8703300

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 above malfunction condition 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 above malfunction condition 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
―  Brake switch 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
•  Air suction in intake-air system (between dynamic chamber and cylinder head)
•  Fuel injector related wiring harness malfunction
•  Ignition system malfunction
―  Spark plug malfunction
―  Ignition coil related wiring harness malfunction
―  Ignition coil malfunction
•  Engine internal malfunction
―  Engine coolant leakage
―  Insufficient engine compression
•  Improper operation of fuel injector
•  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
•  Turn the ignition switch off, then to the ON position (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 [MZR 1.3, MZR 1.5].)
No
Go to the next step.
4
VERIFY CURRENT INPUT SIGNAL STATUS (KEY TO ON/IDLE)
•  Access the following PIDs using the M-MDS:
―  BOO
―  ECT
―  IAT
―  MAF
―  RPM
―  TP REL
―  VSS
•  Is there any signal that is far out of specification when the ignition is switched to ON and the engine runs at idle?
Yes
Inspect the suspected sensor and related wiring harness.
Repair or replace the malfunctioning part according to the inspection results, then go to Step 13.
No
Go to the next step.
5
VERIFY CURRENT INPUT SIGNAL STATUS UNDER FREEZE FRAME DATA (MODE 2) CONDITION
Caution
•  While performing this step, always operate the vehicle in a safe and lawful manner.
•  When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.
•  Access the same PIDs as in Step 4 while simulating under the FREEZE FRAME DATA (Mode 2) condition.
•  Is there any signal which causes drastic changes?
Yes
Inspect the suspected sensor and related wiring harness.
Repair or replace the malfunctioning part according to the inspection results, then go to Step 13.
No
Go to the next step.
6
INSPECT FOR AIR SUCTION AT INTAKE-AIR SYSTEM
•  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 air leakage?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 13.
No
Go to the next step.
7
INSPECT FUEL INJECTOR RELATED WIRING HARNESS
•  Remove the intake-air system parts.
•  Disconnect the fuel injector connector on suspected cylinder.
•  Connect the test light to the fuel injector terminals.
•  Inspect the test light during cranking.
•  Does the test light illuminate?
Yes
Go to the next step.
No
Inspect the fuel injector related wiring harness.
•  Repair or replace the suspected wiring harness, if necessary.
Go to Step 13.
8
INSPECT WHETHER MALFUNCTION IS IN IGNITION SYSTEM OR ELSEWHERE
•  Perform the Spark Test.
•  Is a strong blue spark visible at each cylinder?
Yes
Go to Step 10.
No
Go to the next step.
9
INSPECT SPARK PLUG CONDITION
•  Turn the ignition switch off.
•  Remove the spark plug from suspected cylinder.
•  Inspect the spark plug condition:
―  Cracks
―  Excess wear
―  Gap
―  Wet
•  Is there any malfunction?
Yes
If the spark plug is wet:
•  Fuel flooding is suspected.
―  Go to Step 13.
If the spark plug has a cracks, excessive wear or improper gap:
•  Replace the suspected spark plug, then go to Step 13.
No
Go to the next step.
10
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 13.
No
Go to the next step.
11
INSPECT ENGINE COMPRESSION
•  Inspect the engine compression.
•  Is there any malfunction?
Yes
Perform the engine overhaul for repairs, then go to Step 13.
No
Go to the next step.
12
INSPECT FUEL INJECTOR OPERATION
•  Remove the fuel injector from suspected cylinder.
•  Switch the injector with injector on other cylinder.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine and idle it.
•  Perform the KOER self test.
•  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 [MZR 1.3, MZR 1.5].)
No
Go to the next step.
13
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Perform the KOER self test.
•  Is the PENDING CODE for this DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
14
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 1.3, MZR 1.5].)
No
DTC troubleshooting completed.