P0300

DTC P0300 / P0301 / P0302 / P0303 / P0304

NOTE:

For identification of each cylinder, refer to Precautions for Identification of Cylinder Precautions for Identification of Cylinder.

System Description

ECM measures the angle of the crankshaft based on the pulse signals from the CKP sensor and CMP sensor for each cylinder. If it detects a large change in the angle speed of the crankshaft, it is concluded as the occurrence of a misfire. When the number of misfire is counted by ECM beyond the DTC detecting condition, it determine the cylinder where the misfire occurred and output it as DTC.

DTC Detecting Condition and Trouble Area
















DTC Confirmation Procedure

WARNING:

If you do not select a suitable route and take proper precautions when performing a road test, an accident can occur.

- Select a level road with no traffic to minimize the risk of accident.
- Perform the test extremely carefully.
- Perform the road test using 2 persons, a driver and an assistant.

NOTE:

If DTCs other than aimed DTC are previously detected in DTC confirmation procedure, be sure to troubleshoot DTC previously detected.

1) Warm up engine to normal operating temperature.
2) Drive vehicle at 80 - 100 km/h (50 - 62 mile/h) for 10 min. (Keep engine speed at 2,500 - 4,000 rpm in this step.)

DTC Troubleshooting



1.
Was "Engine and Emission Control System Check" performed?
YES
Go to Step 2.
NO
Go to Engine and Emission Control System Check.

2. DTC check

Check DTC.

Is there DTC(s) other than P0300, P0301, P0302, P0303 and P0304?
YES
Go to applicable DTC(s).
NO
Go to Step 3.

3. Air intake system and exhaust system inspection

Check exhaust system and air intake system for clogging or leak.

Is it in good condition?
YES
Go to Step 4.
NO
Repair or replace defective parts.

4. Ignition system inspection

Check ignition system. Ignition System Check

Is it in good condition?
YES
Go to Step 5.
NO
Repair or replace defective parts.

5. Engine mechanical systems check

Check engine mechanical parts or system which can cause engine rough idle or poor performance.
- Engine compression: Testing and Inspection
- Valve clearance: Service and Repair
- Valve timing: Camshaft and Tappet Removal and Installation

Are they in good condition?
YES
Go to Step 6.
NO
Repair or replace defective parts.

6. Fuel system inspection

Check fuel system. Fuel System Inspection

Is it in good condition?
YES
Substitute a known-good ECM and recheck.
NO
Repair or replace defective parts or wire harness.