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.
1990 Suzuki SamuraiFACTORY OEM SERVICE PROCEDURE
EFI Main Relay SOHC (Swift)
- Remove relay from main fuse box in engine compartment, located between battery and left fenderwell. See Figure . Turn ignition on. Check for battery voltage on White/Red wire terminal and Black/White wire terminal of relay connector. Battery voltage should be present.
- Check continuity between White/Red wire terminal and White/Blue wire terminal of relay. If there is continuity, replace relay. Check resistance between Black/White and White/Black wire terminals of relay. Resistance should be 56-84 ohms. If resistance is not as specified, replace relay.
- Apply battery voltage to Black/White wire terminal and ground Black wire terminal. Check continuity between White/Blue and White/Red wire terminals. If continuity does not exist, replace relay.
NOTE:
On Sidekick, fuel pump relay is combined with control relay. For testing, see CONTROL RELAY
under RELAYS & SOLENOIDS in this article.
Factory Service Tools
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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.