Lexus ES manuals

Lexus ES: Fail-safe Chart

Lexus ES (XZ10) Service Manual / Steering / Power Assist Systems / Power Steering System (for Hv Model) / Fail-safe Chart

FAIL-SAFE CHART

If a problem occurs in the power steering system, the power steering assist will be stopped or the amount of power assist will be decreased to protect the system.

Power Steering System

Malfunction

Fail-safe Operation

EPS warning light

Buzzer
  • Torque sensor (rack and pinion power steering gear assembly) malfunction
  • Power steering motor (rack and pinion power steering gear assembly) malfunction
  • Power steering ECU (rack and pinion power steering gear assembly) malfunction

Power steering assist stops or assist amount is limited

Red or yellow

Sounds intermittently or once
  • Vehicle speed signal malfunction
  • Skid control ECU (brake booster with master cylinder assembly) malfunction
  • Decrease in battery voltage (not malfunction)

Power steering assist is temporarily limited

Yellow

Sounds once

HINT:

  • If the power steering assist stops, the EPS warning light comes on (red).
  • If the amount of power assist is reduced, the EPS warning light comes on (yellow) and a vibration or sound may occur.
  • The amount of power assist may be decreased to prevent the motor and ECUs from overheating if the steering wheel is continuously turned when the vehicle is either stopped or driven at a low speed, or if the steering wheel is kept at either full lock position for a long time. In such cases, the amount of power assist returns to normal if the steering wheel is not turned for approximately 10 minutes with the power switch on (READY).
  • If the auxiliary battery is not sufficiently charged or the voltage decreases temporarily, the amount of power assist will be reduced and the EPS warning light will come on. In such cases, the amount of power assist returns to normal when the auxiliary battery voltage recovers.

READ NEXT:

 Freeze Frame Data

FREEZE FRAME DATA FREEZE FRAME DATA NOTICE: It is difficult to show the specified values (judgment values) clearly because freeze frame data values change significantly due to differences in measur

 Data List / Active Test

DATA LIST / ACTIVE TEST DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. Th

 Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART Power Steering System DTC No. Detection Item DTC Detection Condition Warning Indicate Return-to-normal Condition Note Link C1511 Torque Sensor1 Tor

SEE MORE:

 Lost Communication with Multi-axis Acceleration Sensor Module Missing Message (U012587,U012987,U014087,U015587,U029387)

DESCRIPTION When a malfunction is detected between various ECUs and sensors, these DTCs are stored. DTC No. Detection Item DTC Detection Condition Trouble Area U012587 Lost Communication with Multi-axis Acceleration Sensor Module Missing Message While the vehicle is being driven at

 Dtc Check / Clear

DTC CHECK / CLEAR NOTICE: When the diagnosis system is changed from normal mode to check mode or vice versa, all DTCs and Freeze Frame Data recorded in normal mode are cleared. Before changing modes, always check and make a note of DTCs and Freeze Frame Data. HINT: DTCs which are stored in the EC

© 2016-2024 Copyright www.lexguide.net