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.
LS400 & SC400
1999 Lexus SC 400SECTION LS400 & SC400
- On LS400, remove lower engine cover and oil pan protector for access to crankshaft position sensor. On SC400, remove lower engine cover for access to crankshaft position sensor. On all models, crankshaft position sensor is located at front of crankshaft, near crankshaft pulley. See Figure. Disconnect electrical connector at crankshaft position sensor.
- Using ohmmeter, check resistance between electrical terminals on crankshaft position sensor. Ensure crankshaft position sensor resistance is within specification. See CRANKSHAFT POSITION SENSOR RESISTANCE table. Replace crankshaft position sensor if resistance is not within specification. See IGNITION SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article. Reinstall electrical connector.
CRANKSHAFT POSITION SENSOR RESISTANCE
| Application | Ohms | |||||
|---|---|---|---|---|---|---|
| All Models | ||||||
| Cold (1) | 1630-2740 | |||||
| Hot (2) | 2065-3225 | |||||
|
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RENDER: 1.0x
NO RELATED
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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.