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 LS 430FACTORY OEM SERVICE PROCEDURE
Service Data
STEERING COMPONENTS SERVICE SPECIFICATION
| POWER STEERING FLUID | ||
|---|---|---|
| Fluid level rise | Minimum | 5 mm (0.20 in.) |
| Fluid pressure at idle speed with valve closed | Minimum | 8,336 kPa (85 kgf/cm2 , 1,209 psi) |
| STEERING WHEEL | ||
| Steering wheel freeplay | Maximum | 30 mm (1.18 in.) |
| Steering effort at idle speed | Maximum | 6.9 N.m (70 kgf.cm, 61 in.lbf) |
| POWER STEERING VANE PUMP | ||
| Vane pump rotating torque | Maximum | 0.27 N.m (2.8 kgf.cm, 2.4 in.lbf) |
| Oil clearance between pump shaft and bushing | STD | 0.016 - 0.040 mm (0.0006 - 0.0016 in.) |
| Oil clearance between pump shaft and bushing | Maximum | 0.07 mm (0.0028 in.) |
| Vane plate height | Minimum | 7.6 mm (0.299 in.) |
| Vane plate thickness | Minimum | 1.405 mm (0.0553 in.) |
| Vane plate length | Minimum | 11.993 mm (0.4722 in.) |
| Clearance between the rotor groove and plate | Maximum | 0.03 mm (0.0012 in.) |
| Vane plate length Pump | rotor and cam ring mark | |
| 0 | 12.001 - 12.003 mm (0.47248 - 0.47256 in.) | |
| 1 | 11.999 - 12.001 mm (0.47240 - 0.47248 in.) | |
| 2 | 11.997 - 11.999 mm (0.47232 - 0.47240 in.) | |
| 3 | 11.995 - 11.997 mm (0.47224 - 0.47232 in.) | |
| 4 | 11.993 - 11.995 mm (0.47216 - 0.47224 in.) | |
| Spring free length | Minimum | 36.9 mm (1.453 in.) |
| POWER STEERING GEAR | ||
| Steering rack runout | Maximum | 0.30 mm (0.0118 in.) |
| Total preload (Control valve rotating torque) | Turning | 0.8 - 1.6 N.m (8 - 16 kgf.cm, 7.0 - 13.9 in.lbf) |
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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