P0303

Tests 1 - 2:

Tests 3 - 6:

Tests 7 - 10:

Tests 11 - 12:

SYMPTOM
P0303-CYLINDER #3 MISFIRE

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

WHEN MONITORED
Any time the engine is running, and the adaptive numerator has been successfully updated.

SET CONDITION
When more than a 2% (2.5% LEV) misfire rate is measured during two trips, or with a 10% to 30% misfire rate during one trip.

POSSIBLE CAUSES
- Mis-fire conditions no longer exist
- Fuel system problem
- Secondary ignition or mechanical problem
- Erratic CAM/CRANK sensor signals
- Engine mechanical problem
- Other possible causes for misfire