Lexus ES: Vehicle Speed Signal (C1541)
DESCRIPTION
The power steering ECU (rack and pinion power steering gear assembly) receives vehicle speed signals from the skid control ECU (brake booster with master cylinder assembly) via CAN communication. The ECU provides appropriate assist force in accordance with the vehicle speed based on the signals.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Return-to-normal Condition | Note |
|---|---|---|---|---|---|---|
| C1541 | Vehicle Speed Signal | A vehicle speed signal malfunction is detected |
| EPS warning light: Comes on | The ECU judges the system has returned to normal | - |
CAUTION / NOTICE / HINT
NOTICE:
If the rack and pinion power steering gear assembly has been replaced, perform assist map writing and torque sensor zero point calibration.
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PROCEDURE
| 1. | CHECK CAN COMMUNICATION SYSTEM |
(a) Check if DTC U0129 is output.
Chassis > EMPS > Trouble Codes| Result | Proceed to |
|---|---|
| DTC U0129 is not output. | A |
| DTC U0129 is output. | B |
| A | .gif) | GO TO BRAKE CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) |
| B | | GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the power trunk lid system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. CUSTOMER PROBLEM ANALYSIS HINT:
In troubleshooting, confirm that the problem sym
