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 DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM - AUTOMATICTESTINGPOWER TRANSISTOR
1991 Mazda 929 Base
Power Transistor
1991 Mazda 929 BaseSECTION Power Transistor
- Using an ohmmeter, check continuity between power transistor terminals. See Fig 1 . Continuity should exist when negative lead is connected to terminal "a" and positive terminal is connected to either terminal "b" or "c". If continuity does not exist, replace power transistor.
- No continuity should exist when positive lead is connected to terminal "a" and negative lead is connected to either terminal "b" or "c". If continuity exists, replace power transistor.
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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.