Removing
1. Check the output voltage of the wheel speed sensor.
Front sensor
1. Turn out bolts and remove the sensor of frequency of rotation of a forward wheel (pic. 15.79).
Pic. 15.79. Front and rear wheel speed sensors: 1 - front wheel speed sensor; 2 - front wheel speed sensor rotor: 3 - rear wheel speed sensor rotor; 4 - rear wheel speed sensor
Rear sensor
1. Turn out bolts and remove the gauge of frequency of rotation of a back wheel.
2. Remove the rear wheel speed sensor rotor.
Examination
- Check that there are no metal particles on the surface of the 3-pole sensor probe, and if there are any, remove them.
- Since a magnet is installed inside the speed sensor, the pole of the speed sensor becomes magnetized, causing foreign metal materials to be easily attracted to it. In addition, if the pole piece of the sensor is damaged, the sensor will not be able to correctly detect the wheel speed.
- Measure the resistance value between the terminals of the sensor connector, which should be in the range of 1.28-1.92 kOhm (pic. 15.80).
Pic. 15.80. Checking the resistance of the wheel speed sensor
- If the internal resistance of the wheel speed sensor is out of specification, replace the sensor.
- Check for damage, breakage or poor contact in the sensor wires, if any, replace the wire with a new one. To check for damage to the sensor wire, remove the wire clamp from the body, then bend and pull on the wire to check for a temporary loss of contact.
Installation
1. Installation is carried out in the reverse order of removal.
2. When installing the rear wheel speed sensor, be careful when handling the sensor tip so as not to damage it. Insert a feeler gauge into the gap between the tip of the rear wheel speed sensor and the toothed surface of the ABS sensor rotor, and verify that the gap is within specification all around the rotor (rice. 15.57).
Rated clearance: 0.1-1.9mm