P0303

Tests 1 - 4:

Tests 5 - 8:

Tests 9 - 12:

Tests 13 - 15:

Tests 16 - 17:

SYMPTOM
P0303 - CYLINDER # 3 MISFIRE

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

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
- Misfire does not reoccur
- 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