Engine Controls - MIL ON/DTC P2004 On Start Up

TSB: 01-055/06

2004-2005 MIATA, 2004-2005 MAZDASPEED MX-5 - MIL ON / P2004 SETS AFTER STARTING ENGINE

APPLICABLE MODEL(S)/VINS
2004-2005 Miata
2004-2005 MAZDASPEED MX-5

DESCRIPTION

On some vehicles, after sitting overnight and started, the MIL comes on and DTC P2004 sets into PCM memory. This occurs because vacuum (momentarily) does not flow into the Variable Tumble Control System (VTCS) shutter valve actuator. The contact surface between the valve and the valve body inside the check valve is smooth causing the valve to momentarily stick before more vacuum applies, opening the valve.

As a mass-production change, the contact surface between the valve and valve body has been made rougher to prevent sticking condition. Customers having this concern should have their vehicle repaired using the following repair procedure.

REPAIR PROCEDURE

1. Verify customer concern.

2. Replace check valve with a modified part.





NOTE:
^ Modified check valve can be identified by Yellow marking on the valve body.

3. Verify repair.





PART(S) INFORMATION





WARRANTY INFORMATION

NOTE:
^ This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair. Refer to the Warranty Wizard for warranty term information.

^ Additional diagnostic time cannot be claimed for this repair.





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