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.
PROCEDURE
| 1. | PERFORM TEST MODE (SIGNAL CHECK) INSPECTION (SPEED SENSOR CIRCUIT) |
(a) Using the Techstream, perform a Test Mode (Signal Check) inspection sensor check and check that speed sensor Test Mode (Signal Check) inspection items change from incomplete to complete.
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| Tester Display |
|---|
| Signal Check |
OK:
Speed sensor Test Mode (Signal Check) inspection items change from incomplete to complete.
| Result | Proceed to |
|---|---|
| OK (for Front) | A |
| OK (for Rear) | B |
| NG | C |
NOTICE:
- When cleaning the front speed sensor, make sure to clean the installation hole before installation.
- Do not use parts cleaner when cleaning the front speed sensor rotor.
HINT:
The rear speed sensor and rear speed sensor rotor are incorporated into the rear axle hub and bearing assembly.
If the rear speed sensor and rear speed sensor rotor need to be replaced, replace the rear axle hub and bearing assembly.
| A |  | CLEAN FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR |
| B | | REPLACE REAR AXLE HUB AND BEARING ASSEMBLY |
| C | | INSPECT AND REPAIR MALFUNCTIONING SPEED SENSOR CIRCUIT |
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