DTC P0301, P0302, P0303, P0304 [MZR-CD (RF Turbo)]

DTC P0301 DTC P0302 DTC P0303 DTC P0304	Cylinder No.1 misfire detection Cylinder No.2 misfire detection Cylinder No.3 misfire detection Cylinder No.4 misfire detection
DETECTION CONDITION	• The PCM monitors the CKP sensor input signal interval time. The PCM calculates the deviation of the interval time for each cylinder. If the deviation of the 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 and calculates misfire ratio for each crankshaft revolution. If the ratio exceeds the preprogrammed criteria, the PCM determines that a misfire, which can affect emission performance, has occurred. Diagnostic support note • The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle. • FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Fuel injector malfunction • CKP sensor malfunction • CMP sensor malfunction • Inadequate engine compression due to engine internal malfunction • Related connector or terminal malfunction • Related wiring harness malfunction

DTC P0301

DTC P0302

DTC P0303

DTC P0304

Cylinder No.1 misfire detection

Cylinder No.2 misfire detection

Cylinder No.3 misfire detection

Cylinder No.4 misfire detection

DETECTION CONDITION

• The PCM monitors the CKP sensor input signal interval time. The PCM calculates the deviation of the interval time for each cylinder. If the deviation of the 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 and calculates misfire ratio for each crankshaft revolution. If the ratio exceeds the preprogrammed criteria, the PCM determines that a misfire, which can affect emission performance, has occurred.

Diagnostic support note

• The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.

• FREEZE FRAME DATA is available.

• The DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Fuel injector malfunction

• CKP sensor malfunction

• CMP sensor malfunction

• Inadequate engine compression due to engine internal malfunction

• Related connector or terminal malfunction

• Related wiring harness malfunction

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 the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Bulletins and/or on-line repair information availability. • Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
No	Go to the next step.
3	VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT? • Connect the M-MDS to the DLC-2. • Clear the DTC from the PCM memory using the M-MDS. • Start the engine. • Is the same DTC present?	Yes	Go to the next step.
No	Intermittent concern exists. Perform the “INTERMITTENT CONCERN TROUBLESHOOTING”.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA • Is DTC P0301, P0302, P0303 or P0304 on FREEZE FRAME DATA?	Yes	Go to the next step.
No	Go to troubleshooting procedures for the DTC on the FREEZE FRAME DATA.
5	INSPECT FUEL LINE • Turn the engine switch off. • Inspect the fuel lines of the suspected cylinder for fuel leakage or clogging.	Yes	Repair or replace the suspected fuel line, then go to Step 13.
No	Go to the next step.
6	VERIFY CURRENT INPUT SIGNAL STATUS UNDER TROUBLESHOOTING CONDITION • Access the BOO, ECT, IAT, MAF, RPM, APP, O2S11, SEGRP and VSS PIDs using the M-MDS. • Is any signal that is far out of specification when the engine switch is at the ON position and the engine idles?	Yes	Inspect the suspected circuit or part or both according to the inspection results. Then go to Step 13.
No	Go to the next step.
7	VERIFY CURRENT INPUT SIGNAL STATUS UNDER TROUBLE CONDITION • Inspect the same PIDs as in Step 6 while simulating the FREEZE FRAME DATA condition. • Is there any signal which cause drastic changes?	Yes	Inspect suspected circuit or part or both according to the inspection results. Then go to Step 13.
No	Go to the next step.
8	INSPECT CKP SENSOR • Inspect the CKP sensor and the flywheel. • Is there any malfunction?	Yes	Repair or replace the suspected part according to the inspection results, then go to Step 13.
No	Go to the next step.
9	INSPECT CMP SENSOR • Inspect the CMP sensor. • Is there any malfunction?	Yes	Repair or replace the suspected part according to the inspection results, then go to Step 13.
No	Go to the next step.
10	INSPECT ENGINE COOLANT PASSAGE FOR ENGINE COOLANT LEAKAGE • 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 for the suspected cylinder. • Is the engine compression normal?	Yes	Go to the next step.
No	Overhaul the engine, then go to Step 13.
12	INSPECT FUEL INJECTOR • Inspect the fuel injector and the related circuit for the suspected cylinder. • Is there any malfunction?	Yes	Repair or replace the suspected part according to the inspection results, then go to the next step.
No	Go to the next step.
13	VERIFY TROUBLESHOOTING OF MISFIRE DTC COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. • Perform the Repair Verification Drive Mode. • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
No	Go to the next step.
14	VERIFY AFTER REPAIR PROCEDURE • Perform the Repair Verification Drive Mode. (See OBD DRIVE MODE [MZR-CD (RF Turbo)].) • Are any DTCs present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE [MZR-CD (RF Turbo)])
No	Troubleshooting completed.

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS BEEN RECORDED

• Has FREEZE FRAME DATA been recorded?

Yes

Go to the next step.

Record the FREEZE FRAME DATA on the repair order, then go to the next step.

VERIFY RELATED REPAIR INFORMATION AVAILABILITY

• Verify related Service Bulletins and/or on-line repair information availability.

• Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

• If the vehicle is not repaired, go to the next step.

Go to the next step.

VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?

• Connect the M-MDS to the DLC-2.

• Clear the DTC from the PCM memory using the M-MDS.

• Start the engine.

• Is the same DTC present?

Yes

Go to the next step.

Intermittent concern exists.

Perform the “INTERMITTENT CONCERN TROUBLESHOOTING”.

IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA

• Is DTC P0301, P0302, P0303 or P0304 on FREEZE FRAME DATA?

Yes

Go to the next step.

Go to troubleshooting procedures for the DTC on the FREEZE FRAME DATA.

INSPECT FUEL LINE

• Turn the engine switch off.

• Inspect the fuel lines of the suspected cylinder for fuel leakage or clogging.

Yes

Repair or replace the suspected fuel line, then go to Step 13.

Go to the next step.

VERIFY CURRENT INPUT SIGNAL STATUS UNDER TROUBLESHOOTING CONDITION

• Access the BOO, ECT, IAT, MAF, RPM, APP, O2S11, SEGRP and VSS PIDs using the M-MDS.

• Is any signal that is far out of specification when the engine switch is at the ON position and the engine idles?

Yes

Inspect the suspected circuit or part or both according to the inspection results.

Then go to Step 13.

Go to the next step.

VERIFY CURRENT INPUT SIGNAL STATUS UNDER TROUBLE CONDITION

• Inspect the same PIDs as in Step 6 while simulating the FREEZE FRAME DATA condition.

• Is there any signal which cause drastic changes?

Yes

Inspect suspected circuit or part or both according to the inspection results.

Then go to Step 13.

Go to the next step.

INSPECT CKP SENSOR

• Inspect the CKP sensor and the flywheel.

• Is there any malfunction?

Yes

Repair or replace the suspected part according to the inspection results, then go to Step 13.

Go to the next step.

INSPECT CMP SENSOR

• Inspect the CMP sensor.

• Is there any malfunction?

Yes

Repair or replace the suspected part according to the inspection results, then go to Step 13.

Go to the next step.

INSPECT ENGINE COOLANT PASSAGE FOR ENGINE COOLANT LEAKAGE

• 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.

Go to the next step.

INSPECT ENGINE COMPRESSION

• Inspect the engine compression for the suspected cylinder.

• Is the engine compression normal?

Yes

Go to the next step.

Overhaul the engine, then go to Step 13.

INSPECT FUEL INJECTOR

• Inspect the fuel injector and the related circuit for the suspected cylinder.

• Is there any malfunction?

Yes

Repair or replace the suspected part according to the inspection results, then go to the next step.

Go to the next step.

VERIFY TROUBLESHOOTING OF MISFIRE DTC COMPLETED

• Make sure to reconnect all disconnected connectors.

• Clear the DTC from the PCM memory using the M-MDS.

• Perform the Repair Verification Drive Mode.

• Is the same DTC present?

Yes

Replace the PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the Repair Verification Drive Mode.

(See OBD DRIVE MODE [MZR-CD (RF Turbo)].)

• Are any DTCs present?

Yes

Go to the applicable DTC troubleshooting.

(See DTC TABLE [MZR-CD (RF Turbo)])

Troubleshooting completed.