Toyota Camry Manual page 808

BR–122
Check sensor rotor and sensor installation.
Check and replace ABS ECU.
BRAKE SYSTEM – ANTI–LOCK BRAKE SYSTEM (ABS)
Front
Remove front drive shaft (See SA section).
Check sensor–rotor serrations.
No scratches or missing teeth.
Check the front speed sensor installation
The installation bolt is tightened properly.
Rear
Remove the axle hub (See SA section).
Check the sensor rotor serrations.
No scratches or missing teeth.
Check the speed sensor installation
The installation bolt is tightened properly and
there is no clearance between the sensor and
rear axle carrier.
Replace speed speed or rotor.