P0301

Tests 1 - 4:

Tests 5 - 11:

Tests 12 - 15:

SYMPTOM
P0301 - CYLINDER # 1 MISFIRE

TEST NOTE
This symptom is diagnosed using the test P0300 - MULTIPLE CYLINDER MISFIRE.

WHEN MONITORED
With the engine running, after successfully performing 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
- Other possible causes for misfire
- 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
- Misfire does not reoccur