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 Lexus LS 400FACTORY OEM SERVICE PROCEDURE
Ignition Coils
- Turn ignition off. Disconnect wires from ignition coil. Using a DVOM, check primary coil resistance on ignition coil. See Fig 1. For resistance specifications, see IGNITION COIL RESISTANCE table.
IGNITION COIL RESISTANCE
| Application | (1) Ohms | ||
|---|---|---|---|
| Primary Circuit | .41-.50 | ||
| Secondary Circuit | 10,200-13,800 | ||
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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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