Ignition System - MIL ON/DTC P0300/P0301-P0304

Bulletin: 01-046/10

Last Issued: 08/24/10

Subject:
MULTI MODEL - MIL ILLUMINATION WITH DTC P0300 OR DTCS P0301 - P0304

BULLETIN NOTE
^ THIS BULLETIN SUPERCEDES THE PREVIOUS BULLETIN 01-023/06 ISSUED ON 06/21/06 AND 01-046/10 ISSUED ON 08/20/10. THE REPAIR PROCEDURE HAS BEEN REVISED.

APPLICABLE MODEL(S)/VINS
2007-2009 Mazdaspeed3
2006-2007 Mazdaspeed6
2007-2009 CX-7

DESCRIPTION

Some vehicles may experience a MIL illumination with DTC P0300 (Random Misfire Detection) or DTCS P0301- P0304 (Cylinder No. Misfire Detection) stored in memory during repeated short distance driving. Carbon deposits may accumulate on the spark plugs, which may cause plug fouling. This condition may also cause a rough idle condition.

REPAIR PROCEDURE

When this concern is encountered during repeated short distance driving, burn off the carbon by performing a no-load racing of the engine according to the following:

NOTE:
To avoid damaging the spark plugs, DO NOT use a wire brush for cleaning.

1. Verify concern.

2. Apply parking brake and foot brake.

3. Shift transmission into Neutral.

4. Perform no-load racing at 4,000 RPM for 2 minutes.

5. Idle engine for 1 minute; ensure engine is not overheating.

6. Repeat no-load racing at 4,000 RPM for 2 more minutes.

7. Erase DTCs according to Workshop Manual.

8. Verify repair.





WARRANTY INFORMATION

NOTE:
^ This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair.

^ This repair will be covered under Mazda's New Vehicle Limited Warranty term.

^ Additional diagnostic time cannot be claimed for this repair.