LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2006 >> LS 430 >> Repair and Diagnosis >> Steering >> Power Steering >> Progressive Power Steering System - Diagnostics >> Problem Symptoms Table
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Problem Symptoms Table

Use the table below , with suspected areas listed in numerical order, to determine the cause of the problem. Inspect and repair parts as necessary according to the steps in the following information.

PROBLEM SYMPTOMS TABLE - PROGRESSIVE POWER STEERING

Symptom Suspected Area
When the vehicle is idling, steering effort is high (with the vehicle stopped). If the symptoms still occur even after the following suspected areas are inspected and proved to be normal, replace the power steering ECU assy.
  1. Tire size and tire pressure
  2. Oil reservoir fluid level
  3. Steering fluid pressure
  4. Front wheel alignment
  5. IG power source circuit
  6. PPS linear solenoid valve circuit
Even if vehicle speed increases, steering effort does not increase. If the symptoms still occur even after the following circuits in suspected areas are inspected and proved to be normal, replace the power steering ECU assy.
  1. PPS linear solenoid valve circuit
  2. Vehicle speed signal circuit
scientia non olet · About LEMON Manuals