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.
2003 Suzuki Aerio L4-2.0LFACTORY OEM SERVICE PROCEDURE
Main Relay (Computer/Fuel System): Testing and Inspection
Main Relay Inspection
1) Disconnect negative cable at battery.
2) Remove main relay (1) from relay box (2).
3) Check resistance between each two terminals as follows. If check results are as specified, proceed to next operation check. If not, replace.
Between terminals "A" and "B"
infinity (Infinity)
Between terminals "C" and "D"
70 - 110 ohms
4) Check that there is continuity between terminals "A" and "B" when battery is connected to terminals "C" and "D".
If found defective, replace.
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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