Toyota Avalon 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) 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 > 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

    ABS does not Operate

    ABS Warning Light does not Come ON

    See More:

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    ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT ACCELERATOR PEDAL SENSOR ASSEMBLY (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Powertrain / Hybrid Control / Data List / Accelerator Position Sensor No.1 Voltage %, Acc ...

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