Tech Tip: MIL On/DTC P2004 on Miata and MazdaSpeed Models

Tech Tip: MIL On/DTC P2004 on Miata and MazdaSpeed Models

On some vehicles, after sitting overnight and being 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.

Applicable models: 2004-’05 Miata and MazdaSpeed MX-5.

On some vehicles, after sitting overnight and being 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 the sticking condition. Customers having this concern should have their vehicle ­repaired using the following repair procedure.

Repair Procedure:Figure 1

1. Verify the customer’s concern.

2. Replace the check valve with a modified part (P/N BPYJ-13-995).
Note: The modified check valve can be identified by the yellow marking on the valve body. See Fig. 1.

3. Verify the repair.

Courtesy of ALLDATA.

You May Also Like

FCS Introduces 42 New Numbers in May

Complete strut assemblies, shock absorbers, shock absorber assembly kits and suspension struts for popular VIO applications are included.

FCS Automotive announced the release of 42 new numbers in May, including:

8 Complete Strut Assemblies (936,389 vehicles in operation)

6 Shock Absorber Assembly Kits (2,696,801vehicles in operation)

16 Shock Absorbers (6,245,071 vehicles in operation)

12 Suspension Struts (2,135,974 vehicles in operation)

Philips Ultinon Drive 5000 LED Lightbar Line Expands

Lumileds has expanded the Philips Ultinon Drive 5000 series to include eight models.

DMA Adds New BrakeMaster Coverage

New coverage for Ford and Chevy includes popular pickup trucks and SUVs.

Akebono Expands Severe Duty Disc Brake Pad Kits

Akebono said it expanded its severe-duty ultra-premium disc brake pad line by 14 new part numbers.

GSP Releases New CV Axle Part Numbers

GSP said 14 new CV axle part numbers are in stock and ready to ship.

Other Posts
Topology And Your Scan Tool

Topology influences how you access the modules with your scan tool.

Car properties detailed in "see proof" car image.
Axle Torque Procedures

Guessing the correct torque setting is a bad idea.

Chassis Parts and Alignment Angles

Knowing why the adjustment is required is critical to performing the total alignment.

Steering Angle Sensor Service

Ninety percent of the time when a steering angle sensor code is active, it means the sensor needs to be calibrated.