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.
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HOMESERVICE MANUALSMAZDA1991929 BASEREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMTESTINGABS DIODECONTINUITY TEST
1991 Mazda 929 Base
Continuity Test
1991 Mazda 929 BaseSECTION Continuity Test
- Unplug hydraulic unit 12-pin connector. On Miata, connect positive lead of DVOM to Blue/Yellow wire terminal and negative lead to Gray wire terminal of hydraulic unit. On RX7, connect positive lead of DVOM to Red wire terminal and negative lead to Yellow/Red wire terminal of hydraulic unit.
- On 929, connect positive lead of DVOM to Violet wire terminal and negative lead to Yellow/Red wire terminal of hydraulic unit. 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.
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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.