Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: 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.

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

    Electronically Controlled Brake System(for Gasoline Model)

    ABS Warning Light does not Come ON

    See More:

    Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Pre-collision System(for Hv Model): Diagnostic Trouble Code Chart
    DIAGNOSTIC TROUBLE CODE CHART Pre-collision System DTC No. Detection Item Link C1A01 Driving Support ECU C1A02 Vehicle Information Not Obtained C1A0A Front Radar Sensor Region Code Mismatch C1A10 Front Radar Sensor C1A11 Front Radar Sensor Incorrect Axial Gap C1A14 Front Radar Sensor Beam Axis Not A ...

    Toyota Avalon (XX50) 2019-2022 Owners Manual

    Toyota Avalon (XX50) 2019-2022 Service & Repair Manual

    © 2025 Copyright www.tavalon.net
    0.0111