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
2005 Suzuki Verona L6-2.5LSECTION Testing and Inspection
Main Relay Circuit Check
Circuit Description
When the ignition is turned ON or to the START position, the main relay is energized. The main relay then supplies voltage to the engine fuse box fuse Ef24 and the engine fuse box fuse Ef27.
Diagnostic Aids
- An intermittent problem may be caused by a poor connection, rubbed through wire insulation, or a broken wire inside the insulation.
- A faulty main relay will cause a no start condition. There will be no voltage supplied to the fuel injectors. Without voltage supplied to the fuel injectors, they will not operate.
Wiring Diagram:
Circuit Description
When the ignition is turned ON or to the START position, the main relay is energized. The main relay then supplies voltage to the engine fuse box fuse Ef24 and the engine fuse box fuse Ef27.
Step 1 - 5:
Step 6 - 14:
Diagnostic Aids
- An intermittent problem may be caused by a poor connection, rubbed through wire insulation, or a broken wire inside the insulation.
- A faulty main relay will cause a no start condition. There will be no voltage supplied to the fuel injectors. Without voltage supplied to the fuel injectors, they will not operate.
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.