Toyota Tundra Service 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

OK:

Speed sensor Test Mode (Signal Check) inspection items change from incomplete to complete.

NOTICE:

  • When cleaning the front speed sensor or rear front speed sensor, make sure to clean the installation hole before installation.
  • Do not use parts cleaner when cleaning the front speed sensor rotor or rear speed sensor rotor.
OK

CLEAN SPEED SENSOR AND SPEED SENSOR ROTOR

NG

INSPECT AND REPAIR MALFUNCTIONING SPEED SENSOR CIRCUIT

    ABS does not Operate

    ABS Warning Light does not Come ON

    See More:

    Toyota Tundra Service Manual > Lighting System: Data List / Active Test
    DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the Techstream to read the Data List allows the values or ...

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    Toyota Tundra Service Manual

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