Wheel Speed Sensor: Service and Repair
REMOVAL
Removal Service Points
Front ABS Rotor / Rear ABS Rotor Removal
Caution: Do not damage ABS rotor teeth and never drop the ABS rotor. If the ABS rotor has missing teeth or is deformed, accurate wheel speed detection cannot be expected and the system may fall to function normally.
Front Speed Sensor / Rear Speed Sensor Removal
Caution: When removing the speed sensor from the knuckle, be careful not to strike the tip of the pole piece against the ABS rotor teeth or any other parts.
INSTALLATION
Installation Service Points
>A
Insert a feeler gauge between the speed sensor pole piece and the ABS rotor tooth surface and tighten the speed sensor to specified torque where the clearance is as specified all around.
Standard value: 0.2-0.7 mm (0.008-0.028 inch)
>B
NOTE:
1) The right and left speed sensor brackets differ in shape. Install correctly referring to the identification symbols.
FR: For front speed sensor
R: For right wheel
L: For left wheel
2) After installation of the speed sensor to the bracket, check that the letters "FR" are visible.
>C
Caution: Handle the speed sensor carefully so as not to strike the tip of the pole piece or the ABS rotor teeth against any metal parts and damage them.
Insert a feeler gauge between the speed sensor pole piece and ABS rotor tooth surface and tighten the speed sensor to specified torque where the clearance is as specified all around.
Standard value: 0.3-0.9 mm (0.012-0.035 inch)
INSPECTION
Speed Sensor Check
1) Check the tip of the speed sensor pole piece for deposits of metal or other foreign matter and clean the pole piece as necessary.
Also check the pole piece for damage and replace if damaged.
Caution: The speed sensor pole piece is magnetized by a built-in magnet inside the sensor, so it tends to attract metal. If the pole piece is damaged, accurate wheel speed detection may not be expected.
2) Measure resistance between speed sensor terminals.
Standard value:
Front 1.44-1.76 k ohms
Rear 1.0-1.3 k ohms
If the internal resistance of the speed sensor is out of specification, replace with a new one.
3) Check the speed sensor cable for open circuit and replace if faulty.
NOTE: Remove the cable clamp from the body and, while flexing the cable near the clamp, check for temporary open circuit. Also check connector connection and terminal insertion.
Toothed ABS Rotor Check
Check whether the ABS rotor teeth are broken or deformed. Replace the ABS rotor if the teeth are damaged or deformed.