DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P1300, P1301, P1302, P1303, P1304, P1305, P1306, P1307, P1308, P1319: Misfire Detected In One Or More Cylinders: Description

The flywheel and reluctor ring are divided into four 90-degree segments. The ECM misfire detection system uses information from the Crankshaft Position (CKP) sensor to determine crankshaft speed and position. If a misfire occurs, there will be an instantaneous decrease in engine speed. The ECM is able to compare the length of time each 90-degree segment takes and is therefore able to pinpoint the source of the misfire.

The ECM performs misfire detection as part of OBD system using the following:

• Crankshaft Position (CKP) Sensor.
• Calculation of engine roughness.
• Detection of excess emissions misfire.
• Detection of catalyst damaging misfire.