P0300

DTC P0300 / P0301 / P0302 / P0303 / P0304

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 is beyond the DTC detecting condition, it determines the cylinder where the misfire occurred and outputs 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:

- Be sure to troubleshoot first unexpected DTCs previously detected in "DTC Confirmation Procedure".
- Confirm that the following conditions are met in this "DTC Confirmation Procedure".

- 10 V < Battery voltage < 16 V

- ECT >= -10 °C (14 °F)

- 450 rpm <= Engine speed < 6500 rpm (CVT model)

- 500 rpm <= Engine speed < 6500 rpm (M/T model)

- DTC P0102, P0103, P0335 or P0340 is not 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 Engine and Emission Control System Check.

2. Fuel level check

Check fuel level by fuel meter.

Is indicate "E" level (empty)?
YES -
Add fuel and recheck DTC.
NO -
Go to Step 3.

3. 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 4.

4. Air intake system and exhaust system inspection

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

Are they in good condition?
YES -
Go to Step 5.
NO -
Repair or replace defective parts.

5. Ignition system inspection

Check ignition system. Ignition System Check

Is it in good condition?
YES -
Go to Step 6.
NO -
Repair or replace defective parts.

6. 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 7.
NO -
Repair or replace defective parts.

7. Fuel system inspection

Check fuel system. Fuel System Inspection

Is it in good condition?
YES -
Replace ECM and recheck DTC. Service and Repair
NO -
Repair or replace defective parts or wire harness.