P0301 Cylinder # 1 Misfire

SYMPTOM LIST
P-0301 CYLINDER # 1 MIS-FIRE

TEST NOTE:
This symptom is diagnosed using the test P-0300 MULTIPLE CYLINDER MIS-FIRE.

WHEN MONITORED
With the engine running, after successfully performing a crank sensor learn.

SET CONDITION
When more than a 2% misfire rate is measured during two trips, or with a 10% to 30% misfire rate during one trip.

POSSIBLE CAUSES
- Mis-fire does not reoccur
- Other possible causes for mis-fire
- CAM, Crank, valve timing, or vacuum problem
- Electronic ignition coil output low
- Engine mechanical problem
- Secondary ignition pattern irregular
- Fuel contamination
- Fuel pressure leak down out of specification
- Fuel pump amperage out of specification
- Fuel pump capacity out of specification
- Fuel pump pressure out of specification