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.
1993 Lexus SC 400FACTORY OEM SERVICE PROCEDURE
Difficult To Start When Cold
- Check starter signal circuit. See CODE 43 in appropriate TESTS W/CODES article.
- Check idle speed control valve circuit.
- Check cold start injector system (ES300 & SC400).
- Check fuel system circuit.
- Check injector circuit.
- Ensure ignition coil resistance values are within specification.
- Check distributor.
- Check spark plugs.
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.