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.
Main Relay (Computer/Fuel System): Testing and Inspection
1991 Mazda 323 L4-1600 1597ccSECTION Testing and Inspection
Main Relay Testing:
1. Verify that relay "clicks" when ignition is switched "ON" and "OFF."
2. Unplug relay connector. Check that there is no continuity across terminals "C" and "D."
3. Apply 12V to relay terminal "A" and ground terminal "B."
4. Check that continuity now exists across terminals "C" and "D."
5. If not as specified, replace relay.
RENDER: 1.0x
NO RELATED
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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.