P0301

Test 1:

Test 2 - 4:

Test 5 - 7:

Test 8 - 10:

Test 11 - 14:

Test 15 - 17:

SYMPTOM
P0301-CYLINDER # 1 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 1% misfire rate is measured during two trips, or with a 6% to 30% misfire rate during one trip.

POSSIBLE CAUSES
- Intermittent misfire
- Visual inspection
- Ignition wire
- ASD relay output circuit
- Engine mechanical problem
- Ignition coil
- Coil control circuit
- Spark plug
- Checking fuel pressure
- Fuel pump inlet strainer plugged
- Restricted fuel supply line
- Fuel pump module
- Checking fuel leak down
- Fuel injector
- Injector control circuit
- PCM