DTC Description

If there happen misfires over the threshold value at #4 cylinder, ECM sets DTC P0304.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

Engine roughness through crankshaft speed fluctuation

1.

Poor connection

2.

Ignition system

3.

Fuel system

4.

Intake/exhaust air system

5.

Ignition timing

6.

Injector

Enable Conditions

Time after engine start is higher than 25sec

No CKP sensor error

No rough road condition

No fuel cut off condition

Threshold Value

Misfire rate / cylinder > 10% of total misfire rate (emission threshold)

Misfire rate / cylinder > 25% of total misfire rate (catalyst damage threshold)

Diagnostic Time

Continuous

MIL ON Condition

2 driving cycle or Immediately (Blink)

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