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 MANUALSMAZDA1991323 L4-1600 1597CCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSMAIN RELAY (COMPUTER/FUEL SYSTEM)DESCRIPTION AND OPERATION
1991 Mazda 323 L4-1600 1597cc
Main Relay (Computer/Fuel System): Description and Operation
1991 Mazda 323 L4-1600 1597ccSECTION Description and Operation
The Main Relay (also referred to as Fuel Injection Relay), located in a relay panel mounted forward of the left strut tower, supplies power to the ECU and a number of ECU controlled devices when the ignition is switched "ON." These devices include the circuit opening relay, distributor, fuel injectors and a variety of solenoid valves. The ECU completes the circuit by grounding these devices when indicated by its calculations.
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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.