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.
1997 Lexus LX 450FACTORY OEM SERVICE PROCEDURE
EFI Main Relay
- Ensure ignition is off. Remove EFI main relay from fuse/relay box at driver's side front corner of engine compartment, near the battery.
- To test EFI main relay continuity, use ohmmeter to check continuity between specified terminals. See Figure.
- To test EFI main relay operation, apply battery voltage and ground to specified terminals on EFI main relay and use ohmmeter to check continuity between specified terminals. See Figure. Replace EFI main relay if defective.
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.
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