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.
1992 Mazda 929FACTORY OEM SERVICE PROCEDURE
Continuity Test
- Check METER fuse and ABS warning light bulb. Check wiring harness between ABS warning light and control unit, and between ABS warning light and hydraulic unit. Repair or replace as necessary. Disconnect hydraulic unit connector. On Miata, connect positive lead of DVOM to Blue/Yellow wire terminal and negative lead to Green/Yellow wire terminal of hydraulic unit connector. See Fig 1 .
- On 929, connect positive lead of DVOM to terminal "G" (Gray wire) and negative lead to Yellow/Red wire terminal of hydraulic unit connector. See Fig 2 . Ensure continuity is present between terminals. Reverse DVOM leads. Continuity should not be present with leads reversed. If ABS diode does not test as described, replace ABS diode.
Factory Service Tools
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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.
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