Intention Of Troubleshooting Procedure

Step 1-2
- Perform an ignition system parts inspection.
Step 3
- Perform a fuel injector control system inspection.
Step 4-9
- Perform an inspection of parts which may be affected by misfire except for ignition-related parts and fuel injection control-related parts.
Step 10-11
- Verify that primary malfunction is resolved and there are no other malfunctions.

DTC P0300:00 PCM (SKYACTIV-G 2.5 - WITH CYLINDER DEACTIVATION) TROUBLESHOOTING DIAGNOSTIC PROCEDURE

STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: DETERMINE INTEGRITY OF SPARK PLUG Inspect the spark plug. (See SPARK PLUG INSPECTION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)] .) Is there any malfunction?	Yes	Replace the spark plug, then go to Step 10. (See SPARK PLUG REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)] .)
1		No	Go to the next step.
2	PURPOSE: DETERMINE INTEGRITY OF IGNITION COIL Inspect the ignition coil. (See IGNITION COIL INSPECTION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)] .) Is there any malfunction?	Yes	Replace the ignition coil/ion sensor, then go to Step 10. (See IGNITION COIL/ION SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)] .)
2		No	Go to the next step.
3	PURPOSE: DETERMINE INTEGRITY OF FUEL INJECTOR Inspect the fuel injector. (See FUEL INJECTOR INSPECTION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)] .) Is there any malfunction?	Yes	Replace the fuel injector, then go to Step 10. (See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)] .)
3		No	Go to the next step.
4	PURPOSE: VERIFY IF MALFUNCTION RELATED TO INTAKE-AIR SYSTEM IS CAUSE OF MISFIRE Visually inspect for loose, cracked or damaged hoses on intake air system. Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 10.
4		No	Go to the next step.
5	PURPOSE: VERIFY IF POOR DRIVE BELT ASSEMBLY IS CAUSE OF MISFIRE Verify the condition of the drive belt assembly. (See DRIVE BELT INSPECTION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)] .) Is there any malfunction?	Yes	Assemble drive belt correctly, then go to Step 10. (See DRIVE BELT REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)] .)
5		No	Go to the next step.
6	PURPOSE: VERIFY IF FOREIGN MATTER ON DRIVE BELT IS CAUSE OF MISFIRE Verify if oil is on the drive belt. Is there foreign matter on the drive belt?	Yes	Remove the foreign matter on the drive belt, then go to Step 10.
6		No	Go to the next step.
7	PURPOSE: DETERMINE INTEGRITY OF DRIVE BELT AUTO TENSIONER Inspect the drive belt auto tensioner. (See DRIVE BELT AUTO TENSIONER INSPECTION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)] .) Is there any malfunction?	Yes	Replace the drive belt auto tensioner, then go to Step 10. (See DRIVE BELT AUTO TENSIONER REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)] .)
7		No	Go to the next step.
8	PURPOSE: VERIFY IF MALFUNCTION RELATED TO ENGINE COMPRESSION IS CAUSE OF MISFIRE Inspect the engine compression. (See COMPRESSION INSPECTION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)] .) Are compression pressures within specification?	Yes	Go to the next step.
8		No	Replace or overhaul the engine, then go to Step 10.
9	PURPOSE: VERIFY IF MALFUNCTION RELATED TO SEALING OF ENGINE UNIT (COMBUSTION CHAMBER AND ENGINE COOLANT PASSAGE) IS CAUSE OF MISFIRE Perform the "ENGINE COOLANT LEAKAGE INSPECTION". (See ENGINE COOLANT LEAKAGE INSPECTION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)] .) Does the radiator cap tester needle drop even though there is no engine coolant leakage from the radiator or the hoses?	Yes	Engine coolant leakage from the engine (between the combustion chamber and the engine coolant passage) may have occurred. Verify the conditions of the gasket and the cylinder head. If there is any malfunction: Repair or replace the malfunctioning part according to the inspection results, then go to the next step.
9		No	Go to the next step.
10	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION Always reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [PCM (SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION))] .) Implement the repeatability verification procedure. (See REPEATABILITY VERIFICATION PROCEDURE .) Perform the Pending Trouble Code Access Procedure. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION))] .) Is the PENDING CODE for this DTC present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION)] .) Go to the next step.
10		No	Go to the next step.
11	PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION Is any other DTC or pending code stored?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 2.5 (WITH CYLINDER DEACTIVATION))] .)
11		No	DTC troubleshooting completed.