Brake Fluid Pressure Sensor Inspection

Turn the ignition switch to the ON position, then measure the voltage between brake fluid pressure sensor terminal C and ground.
- If there is any malfunction, inspect the wiring harness between brake fluid pressure sensor terminal C and DSC HU/CM terminal C, then repair or replace if necessary.
  Standard voltage: 4.75-5.25 V
  
  Fig 1: Identifying Brake Fluid Pressure Sensor Connector Terminals
  Courtesy of MAZDA MOTORS CORP.
Measure the voltage between brake fluid pressure sensor terminal A and the ground.
- If there is any malfunction, inspect the wiring harness between brake fluid pressure sensor terminal A and DSC HU/CM terminal E, then repair or replace if necessary.
  Standard voltage: 0 V
Turn the ignition switch off.
Install the SSTs to the master cylinder.
NOTE:
- Install the SST (49 D043 002 or 49 N043 001) to the master cylinder using a commercially available flare nut wrench.
  - Flare nut across flat: 12 mm {0.47 in}
Bleed the air from the SSTs and the brake line. (Bleed air from the SSTs through air bleeding valve A.)

Fig 2: Installing SST To Master Cylinder
Courtesy of MAZDA MOTORS CORP.
Connect the M-MDS or equivalent to the DLC-2.

Fig 3: Identifying DLC-2 Connector
Courtesy of MAZDA MOTORS CORP.
Select the MCYLI P PID.
Start the engine.
Depress the brake pedal, and confirm that the fluid pressure value of the SST (Gauge) and the value shown on the M-MDS or equivalent are equal.
- If the fluid pressures are different, replace the DSC HU/CM.