P0303

Tests 1 - 5:

Tests 6 - 8:

SYMPTOM
P0303 - CYLINDER # 3 MISFIRE

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

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

SET CONDITION
When more than a 2 % (1.5 % LEV) misfire rate is measured during two trips, or with a 10 % to 30 % misfire rate during one trip.

POSSIBLE CAUSES
- Misfire conditions no longer exist
- Engine mechanical problem
- Erratic Cam/Crank sensor signals
- Other possible causes for misfire
- Secondary ignition or mechanical problem