Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Mazda MX-5 Miata Club, Automatic TransFACTORY OEM SERVICE PROCEDURE
Function Inspection
- Connect the M-MDS to the DLC-2.
- Switch the ignition ON (engine off).
- Display the PID BBP. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)] .) (See PCM INSPECTION .)
- Compare the voltage and power brake unit vacuum indications for the PID BBP with the standard in the table indicated below.
- If they do not match the standard, replace the PCM. (See PCM REMOVAL/INSTALLATION .)
- If they match the standard, perform the voltage inspection. (See VOLTAGE INSPECTION .)
Standard
| BBP | |
|---|---|
| V | kPa {kgf/cm2 , psi} |
| Approx. 0.79 | 20 {0.20, 2.9} |
| Approx. 1.8 | 47 {0.48, 6.8} |
| Approx. 4.0 | 101 {1.03, 14.6} |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.