Lexus ES: ABS Operates Before Necessary When Braking
DESCRIPTION
Troubleshooting for when ABS operates too soon due to a noisy signal from the speed sensor, a difference in output, etc.
CAUTION / NOTICE / HINT
NOTICE:
-
After replacing or removing and installing a speed sensor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly.
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-
After replacing or removing and installing a speed sensor rotor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly.
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PROCEDURE
| 1. | PERFORM DEALER MODE (SIGNAL CHECK) INSPECTION (SPEED SENSOR CHECK) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Enter the following menus: Chassis / Brake/EPB / Utility / Signal Check.
(d) Using the Techstream, perform a Dealer Mode (Signal Check) inspection sensor check and check that speed sensor Dealer Mode (Signal Check) inspection items change from incomplete to complete.
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| Tester Display |
|---|
| Signal Check |
OK:
Speed sensor Dealer Mode (Signal Check) inspection items change from incomplete to complete.
| Result | Proceed to |
|---|---|
| OK (for Front) | A |
| OK (for Rear (2WD)) | B |
| OK (for Rear (AWD)) | C |
| NG | D |
NOTICE:
- When cleaning the front speed sensor and rear speed sensor (for AWD), make sure to clean the installation hole before installation.
- Do not use parts cleaner when cleaning the front speed sensor rotor and rear speed sensor rotor (for AWD).
HINT:
The rear speed sensor and rear speed sensor rotor are incorporated into the rear axle hub and bearing assembly. (for 2WD)
If the rear speed sensor and rear speed sensor rotor need to be replaced, replace the rear axle hub and bearing assembly. (for 2WD)
| A |  | CLEAN FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR |
| B | | REPLACE REAR AXLE HUB AND BEARING ASSEMBLY |
| C | | CLEAN REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR |
| D | | INSPECT AND REPAIR MALFUNCTIONING SPEED SENSOR CIRCUIT |
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