Engine Controls - False MIL ON/False 'U' Codes Set
01-002/05 2003-2004 MAZDA6 AND 2005 MAZDA6 2.3L - FALSE MIL ILLUMINATION WITH MULTIPLE U-CODE DTCSAPPLICABLE MODEL(S)/VINS
All 2003 - 2004 Mazda6
2005 Mazda6 2.3L only
DESCRIPTION
Some customer vehicles may have a false MIL illumination with multiple U-code DTCs. This condition may be caused if the WDS DLC cable is connected or disconnected while the ignition switch is in the ON position, or when the engine is idling.
IMPORTANT:
When connecting or disconnecting the WDS DLC cable (or any scan tool equipment) to the DLC-2 connector (under dash), the ignition switch must be in the OFF position, otherwise, the MIL light may come ON and false CAN communication DTC codes may be set in the different CAN bus modules.
The DTCs shown may be stored if this condition occurs.
NOTE:
It has been reported that some customer vehicles have failed the state emission OBD II test. This may be caused by the inspection station connecting or disconnecting the DLC cable when the ignition switch in the ON position, or when the engine is idling.
Customers having this concern should have their vehicle repaired using the following repair procedure.
REPAIR PROCEDURE
1. Verify customer concern.
2. Erase all DTCs.
3. Turn OFF MIL.
4. Turn ignition switch to OFF position.
5. Disconnect WDS DLC or scan tool cable.
6. Verify repair.
NOTE:
Do not return vehicle to customer with MIL illuminated.
Disclaimer