DTC P0301: Cylinder 1 Misfire Detected, DTC P0302: Cylinder 2 Misfire Detected, DTC P0303: Cylinder 3 Misfire Detected, DTC P0304: Cylinder 4 Misfire Detected, DTC P0305: Cylinder 5 Misfire Detected, DTC P0306 Cylinder 6 Misfire Detected

Misfire Detected Circuit
• Refer to, DTC P0201, P0202, P0203, P0204, P0205, P0206 - Injector Circuit .
CIRCUIT OPERATION
• Refer to, DTC P0201, P0202, P0203, P0204, P0205, P0206 - Injector Circuit .
TECHNICAL DESCRIPTION
• If a misfire occurs while the engine is running, the engine speed changes for an instant.
• The PCM checks for such changes in engine speed.
DESCRIPTIONS OF MONITOR METHODS
Monitor angular acceleration of crankshaft and detect malfunction when negative variation of the angular acceleration is large.
MONITOR EXECUTION
Continuous
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
• Not applicable

Sensor (The sensor below is determined to be normal)
• Camshaft position sensor
• Volume airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor
DTC SET CONDITIONS Logic Flow Chart


Check Conditions
Engine speed is between 440 and 6,000 r/min.
Engine coolant temperature is higher than -10°C (14°F).
Barometric pressure is higher than 76 kPa (22.4 in.Hg).
Adaptive learning is complete for the vane which generates a crankshaft position signal.
While the engine is running, excluding gear shifting, deceleration, sudden acceleration/deceleration and A/C compressor switching and fuel shut-off operation.
The throttle deviation is -0.06 volt/10 ms to +0.06 volt/10 ms.

Judgement Criteria (change in the angular acceleration of the crankshaft is used for misfire detection).
• Misfire has occurred more frequently than allowed during the last 200 revolutions [when the catalyst temperature is higher than 950°C (1,742°F)].
or
• Misfire has occurred in 20 or more of the last 1,000 revolutions (corresponding to 1.5 times the limit of emission standard).
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Procedure 6 - Other Monitor .
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:
• Ignition system related part(s) failed.
• Low compression pressure.
• Injector failed.
• Harness damage in injector circuit, or connector damage.
• PCM failed.