2003 Lexus GS 430FACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Use table below to help you find the cause of the problem. The numbers indicate the priority of the likely cause of the problem. Check each part in the order shown. If necessary, repair or replace these parts.

PROBLEM SYMPTOMS TABLE - POWER STEERING SYSTEM

Symptom Suspect Area
Hard steering
  1. Tires (Improperly inflated)
  2. Power steering fluid level (Low)
  3. Drive belt (Loose)
  4. Front wheel alignment (Incorrect)
  5. Steering system joints (Worn)
  6. Suspension arm ball joints (Worn)
  7. Steering column (Binding)
  8. Vane pump assy
  9. Rack & pinion power steering gear assy
Poor return
  1. Tires (Improperly inflated)
  2. Front wheel alignment (Incorrect)
  3. Steering column (Binding)
  4. Rack & pinion power steering gear assy
Excessive play
  1. Steering system joints (Worn)
  2. Suspension arm ball joints (Worn)
  3. Steering intermediate shaft sub-assy (Worn)
  4. Sliding yoke (Worn)
  5. Front wheel bearing (Worn)
  6. Rack & pinion power steering gear assy
Abnormal noise
  1. Power steering fluid level (Low)
  2. Steering system joints (Worn)
  3. Vane pump assy
  4. Rack & pinion power steering gear assy
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:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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