DTC P0301, P0302, P0303, P0304, P0305, P0306, P0316 [MZI-3.7 (PCM CONNECTOR (2 TYPES))]

id0102e3880800

DTC P0301

DTC P0302

DTC P0303

DTC P0304

DTC P0305

DTC P0306

DTC P0316

P0301: Cylinder No.1 misfire detected

P0302: Cylinder No.2 misfire detected

P0303: Cylinder No.3 misfire detected

P0304: Cylinder No.4 misfire detected

P0305: Cylinder No.5 misfire detected

P0306: Cylinder No.6 misfire detected

P0316:Misfire detected on startup (first 1000 revolutions)
DETECTION CONDITION
•  The PCM monitors the crankshaft position sensor input signal interval time. The PCM calculates the change of the interval time for each cylinder. If the change of interval time exceeds the pre-programmed criteria, the PCM detects a misfire in the corresponding cylinder. when 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 pre-programmed criteria, the PCM determines that a misfire, which can damage the catalytic converter or affect emission performance, has occurred.
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 and terminal malfunction
―  Related wiring harness malfunction
•  Spark plug malfunction
•  Ignition system malfunction
•  Ignition coil malfunction
•  Fuel injector malfunction
•  Air suction in intake air system (between dynamic chamber and cylinder head)
•  Engine malfunction (Leakage engine coolant)
•  Inadequate engine compression due to engine internal malfunction
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME DATA 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 OR STORED DTCs
•  Turn the ignition switch off then to the ON position (Engine off).
•  Verify related pending code or stored DTCs.
•  Are other DTCs present?
Yes
Go to the appropriate DTC troubleshooting.
(See DTC TABLE [MZI-3.7 (PCM CONNECTOR (2 TYPES))].)
No
Go to the next step.
4
VERIFY CURRENT INPUT SIGNAL STATUS (KEY TO ON /IDLE)
•  Access APP1, APP2, APP3, ECT, IAT, MAF, RPM, TP_REL and VSS PIDs using the M-MDS.
•  Is there any signal that is far out of specification when the ignition switch is in the ON position and the engine runs at idle?
Yes
Inspect the suspected circuit or part or both according to inspection results. Then go to Step 13.
(See PCM INSPECTION [MZI-3.7].)
No
Go to the next step.
5
VERIFY CURRENT INPUT SIGNAL STATUS UNDER TROUBLE CONDITION
•  Inspect the same PIDs as in Step 4 when simulating the FREEZE FRAME DATA condition.
•  Is there any signal which causes drastic changes?
Yes
Inspect the suspected circuit or part or both according inspection results. Then go to Step 13.
(See PCM INSPECTION [MZI-3.7].)
No
Go to the next step.
6
INSPECT SPARK PLUG CONDITION
•  Turn the ignition switch off.
•  Remove the spark plug from the suspected cylinder.
•  Check the spark plug condition:
―  Cracks
―  Excess wear
―  Gap
―  Wet
•  Is any problem found on the spark plug?
Yes
•  If the spark plug is wet, fuel flooding is suspected. Go to Step 9.
•  If the spark plug has a crack, excess wear or improper gap, replace the malfunctioning spark plug. Then go to Step 13.
No
Go to the next step.
7
INSPECT IGNITION SYSTEM OPERATION FOR SUSPECTED CYLINDER
•  Perform the spark test for the suspected cylinder.
•  Are the results of the spark test normal?
Yes
Go to the next step.
No
Replace or replace the malfunctioning part according to the spark test results, then go to Step 13.
8
INSPECT FUEL INJECTOR WIRING HARNESS
•  Remove the intake air system parts.
•  Disconnect the fuel injector connector on the suspected cylinder.
•  Connect the noid light to the fuel injector connector terminals.
•  Verify the light dimness during cranking.
•  Does the noid light illuminate?
Yes
Go to the next step.
No
Inspect the fuel injector wiring harnesses. Repair or replace if necessary, then go to Step 13.
9
INSPECT FUEL INJECTOR OPERATION
•  Remove fuel injector from the suspected cylinder.
•  Swap the fuel injector with one from another cylinder.
•  Start the engine and run it at idle.
•  Is there the misfire DTC for the cylinder which has a suspected fuel injector?
Yes
Replace fuel injector, then go to Step 13.
(See FUEL INJECTOR REMOVAL/INSTALLATION [MZI-3.7].)
No
Go to the next step.
10
INSPECT FOR AIR SUCTION AT INTAKE AIR SYSTEM
•  Inspect for air leakage at the following:
―  Around the connection of the dynamic chamber and the intake manifold
―  Around the connection of the intake manifold and the cylinder head
•  Is air leakage found?
Yes
Repair or replace the suspected part, then go to Step 13.
No
Go to the next step.
11
INSPECT SEALING OF ENGINE COOLANT PASSAGE
Warning
•  Never remove the cooling system cap or loosen the radiator drain plug while the engine is running, or when the engine and radiator are hot. Scalding engine coolant and steam may shoot out and cause serious injury. It may also damage the engine and cooling system.
•  Turn off the engine and wait until it is cool. Even then, be very careful when removing the cap. Wrap a thick cloth around it and slowly turn it counterclockwise to the first stop. Step back while the pressure escapes.
•  When you are sure all the pressure is gone, press down on the cap using the cloth, turn it, and remove it.
•  Remove the radiator cap.
•  Implement the procedure to bleed air from the engine coolant, then run the engine at idle.
•  Are there any small bubbles which make the engine coolant white at filling opening?
Note
•  Large bubbles are normal since they are remaining air coming from the engine coolant passage.
Yes
Air penetrates due to poor sealing of the head gasket or other areas between the combustion chamber and the engine coolant passage. Repair or replace malfunctioning parts, then go to Step 13.
No
Go to the next step.
12
INSPECT ENGINE COMPRESSION
•  Inspect the engine compression.
•  Is the engine compression normal?
Yes
Go to the next step.
No
Overhaul the engine, then go to the next step.
13
VERIFY TROUBLESHOOTING OF MISFIRE DTC HAS BEEN COMPLETED
•  Verify that all disconnected connectors are reconnected.
•  Turn the ignition switch to the ON position (Engine off).
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine and run it at idle.
•  Retrieve DTCs using the M-MDS.
•  Is the PENDING CODE for this DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [MZI-3.7].)
No
Go to the next step.
14
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTC present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZI-3.7 (PCM CONNECTOR (2 TYPES))].)
No
Troubleshooting completed.