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.
1992 Lexus LS 400FACTORY OEM SERVICE PROCEDURE
Ground Circuits (LS400)
- Ensure ignition is off. Using a DVOM, measure resistance between ECU terminal No. 22 of connector E10 and ground with ECU connector connected. See Fig 1.
- Resistance should be one ohm or less. If resistance is within specification, no fault is present with ground circuits. If resistance is not within specification, carefully disconnect ECU connector.
- Check ECU ground terminal and wire harness connector for corrosion and damage. Repair as necessary.
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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