Intention of troubleshooting procedure

WARNING: This page is about a different variant/trim than selected.

Step 1-2
- Perform an ignition system parts inspection.
Step 3
- Perform a fuel injector control system inspection.
Step 4
- Perform a EGR valve operation inspection.
Step 5-10
- Perform an inspection of parts which may be affected by misfire except for ignition-related parts and fuel injection control-related parts.
Repair completion verification
- Verify that the primary malfunction is resolved and there are no other malfunctions.

P0300-00: (PCM - VIN Y) TROUBLESHOOTING DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	PURPOSE: VERIFY SPARK PLUG FOR MALFUNCTION Inspect the applicable part. (Refer to SPARK PLUG INSPECTION (VIN Y) in the service information.) Is the part normal?	Yes	Go to the next step.
1		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to SPARK PLUG REMOVAL/INSTALLATION (VIN Y) in the service information.)
2	PURPOSE: VERIFY IGNITION COIL FOR MALFUNCTION Inspect the applicable part. (Refer to IGNITION COIL INSPECTION (VIN Y) in the service information.) Is the part normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to IGNITION COIL/ION SENSOR REMOVAL/INSTALLATION (VIN Y) in the service information.)
3	PURPOSE: VERIFY FUEL INJECTOR FOR MALFUNCTION Inspect the applicable part. (Refer to FUEL INJECTOR INSPECTION (VIN Y) in the service information.) Is the part normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to FUEL INJECTOR REMOVAL/INSTALLATION (VIN Y) in the service information.)
4	PURPOSE: INSPECT EGR VALVE CONTROL SYSTEM OPERATION Inspect the applicable part. (Refer to EGR VALVE INSPECTION (VIN Y) in the service information.) Is the part normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to EGR VALVE REMOVAL/INSTALLATION (VIN Y) in the service information.)
5	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 location and perform the repair completion verification 1.
5		No	Go to the next step.
6	PURPOSE: VERIFY IF POOR DRIVE BELT ASSEMBLY IS CAUSE OF MISFIRE Verify the condition of the drive belt assembly. (Refer to DRIVE BELT INSPECTION (VIN Y) in the service information.) Is there any malfunction?	Yes	Assemble drive belt correctly and perform the repair completion verification 1. (Refer to DRIVE BELT REMOVAL/INSTALLATION (VIN Y) in the service information.)
6		No	Go to the next step.
7	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 and perform the repair completion verification 1.
7		No	Go to the next step.
8	PURPOSE: VERIFY DRIVE BELT AUTO TENSIONER FOR MALFUNCTION Inspect the applicable part. (Refer to DRIVE BELT AUTO TENSIONER INSPECTION (VIN Y) in the service information.) Is the part normal?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to DRIVE BELT AUTO TENSIONER REMOVAL/INSTALLATION (VIN Y) in the service information.)
9	PURPOSE: VERIFY IF MALFUNCTION RELATED TO ENGINE COMPRESSION IS CAUSE OF MISFIRE Inspect the engine compression. (Refer to COMPRESSION INSPECTION (VIN Y) in the service information.) Is the engine compression pressure normal?	Yes	Go to the next step.
9		No	Replace or overhaul the engine and perform the repair completion verification 1.
10	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]. (Refer to ENGINE COOLANT LEAKAGE INSPECTION (VIN Y) in the service information.) 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 complete (between combustion chamber and engine coolant passage) can be considered. Verify gasket and cylinder head condition. If there is any malfunction: Repair or replace the malfunctioning location and perform the repair completion verification 1.
10		No	Go to the next step.
Repair completion verification 1	PURPOSE: VERIFY THAT VEHICLE IS REPAIRED Install/connect the part removed/disconnected during the troubleshooting procedure. Clear the DTC recorded in the memory. (see CLEARING DTC .) Replicate the vehicle conditions at the time the DTC was detected using the following procedure. Implement the repeatability verification procedure. (See REPEATABILITY VERIFICATION PROCEDURE .) Perform the DTC inspection for the PCM. (See DTC INSPECTION .) Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See MALFUNCTION DIAGNOSIS FLOW [CONTROLLER AREA NETWORK (CAN)] .) If the CAN communication is normal, perform the diagnosis from Step 1. If the malfunction recurs, replace the PCM, then go to the next step. (Refer to applicable PCM REMOVAL/INSTALLATION (VIN Y) in the service information.)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	PURPOSE: VERIFY IF OTHER DTCs DISPLAYED Perform the DTC inspection. (See DTC INSPECTION .) Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.