Brake Fluid Pressure Sensor Inspection

WARNING: This page is about a different car, the 2008 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Turn the ignition switch off.
Install the SSTs to the master cylinder as shown in the figure.
NOTE:
- When installing the SST (49 D043 0A0) to the master cylinder, use a commercially available flare nut wrench (flare nut across flat 12 mm {0.47 in}).
Bleed the brake line and the SSTs of air. (Bleed the SSTs of air using air bleed valve A.)

Fig 1: Installing SST To Master Cylinder
Courtesy of MAZDA MOTORS CORP.
Connect the M-MDS to the DLC-2.
Select the "MPRETDR" PID. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .)
Start the engine.
Depress the brake pedal, and verify that the fluid pressure value of the SST (gauge) and the value shown on the M-MDS are equal.
- If the fluid pressure values are different, replace the DSC HU/CM. (See DSC HU/CM REMOVAL/INSTALLATION ).
  
  Fig 2: Identifying DLC-2 Connector
  Courtesy of MAZDA MOTORS CORP.