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.
2003 Lexus SC 430FACTORY OEM SERVICE PROCEDURE
Service Data
SERVICE DATA SPECIFICATIONS
| Starter | Rated voltage and output power | 12 V 2.0 kW | ||
| No-load characteristics | Current | 100 A or less at 11.5 V | ||
| RPM | 2,500 RPM or less | |||
| Brush length | STD | 15.0 mm (0.591 in.) | ||
| Minimum | 9.0 mm (0.354 in.) | |||
| Spring installed load | STD | 21.5-27.5 N (2.2-2.8 kgf, 4.9-6.2 lbf) | ||
| Minimum | 12.7N (1.3 kgf, 2.9 lbf) | |||
| Commutator | Diameter | STD | 35.0 mm (1.378 in.) | |
| Minimum | 34.0 mm (1.339 in.) | |||
| Undercut depth | STD | 0.7 mm (0.028 in.) | ||
| Minimum | 0.2 mm (0.008 in.) | |||
| Circle runout | Maximum | 0.05 mm (0.0020 in.) | ||
| Magnetic switch | Contact plate for wear | Maximum | 0.9 mm (0.035 in.) | |
| Battery | Specific gravity | at 20°C (68°F) | 1.25-1.29 | |
| Voltage | at 20°C (68°F) | 12.5-12.9V | ||
| Generator | Rated output | 12V 100A | ||
| Rotor coil resistance | at 20°C (68°F) | 2.1-2.5 ohm | ||
| Slip ring diameter | STD | 14.2-14.4 mm (0.559-0.567 in.) | ||
| Minimum | 12.8 mm (0.504 in.) | |||
| Brush exposed length | STD | 9.5-11.5 mm (0.374-0.453 in.) | ||
| Minimum | 1.5 mm (0.059 in.) | |||
| Voltage regulator | Regulating voltage | 13.2-14.8 V | ||
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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