Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: ABS Operates Before Necessary When Braking

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System(for Gasoline Model) / 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) Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Utility / Signal Check.

(b) 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.

Click here

Chassis > ABS/VSC/TRAC/EPB > Utility

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.

CLEAN FRONT SPEED SENSOR AND FRONT SPEED SENSOR ROTOR

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY

INSPECT AND REPAIR MALFUNCTIONING SPEED SENSOR CIRCUIT

Electronically Controlled Brake System(for Gasoline Model)

ABS Warning Light does not Come ON

See More:

Toyota Avalon (XX50) 2019-2022 Owners Manual > Do-it-yourself maintenance: Checking and replacing fuses
If any of the electrical components do not operate, a fuse may have blown. If this happens, check and replace the fuses as necessary. 1. Turn the engine switch off. 2. Open the fuse box cover. Engine compartment (type A) Push the tabs in and lift the lid off. Engine compartment (type B) (if equippe ...