Test Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Ford RV Cutaway, 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.

AR1 PRELIMINARY DIAGNOSIS FOR DTC P0300

Retrieve and record all DTCs.
Record the freeze frame data.
Clear all DTCs.
Carry out the continuous self-test.

Are any DTCs present?

Yes	No
For DTC P0300, GO to AR2. For all others, REFER to DIAGNOSTIC TROUBLE CODE (DTC) DESCRIPTIONS .	The misfire is intermittent and is currently not active. REFER to SYMPTOM CHARTS , if a driveability concern exists.

AR2 DIAGNOSTIC TROUBLE CODE (DTC) P0300

Possible causes:
- fuel concern
- oil aeration
- high pressure oil pump malfunction
- fuel injector(s)
- mechanical engine failure
- electrical failure
Carry out a visual inspection. Check for loose connections, and damaged or corroded pins. Wiggle the harness, attempting to recreate the fault.

Are any wiring or terminal concerns present?

Yes	No
REPAIR as necessary. CLEAR the DTCs. CARRY OUT the OBD drive cycle. REFER to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE .	REFER to PERFORMANCE DIAGNOSTIC PROCEDURES . CLEAR the DTCs. REPEAT the self-test.