Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001Q22W
Model Year Start: 2021 Model: Avalon Prod Date Range: [08/2020 - 08/2021]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model): ABS Operates Before Necessary When Braking; 2021 MY Avalon [08/2020 - 08/2021]

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 2021 MY Avalon [08/2020 - 08/2021]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model): TEST MODE PROCEDURE

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 (for 2WD))

B

OK (for Rear (for 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