Front speed sensor (up) and rear wheel
On the front wheels: 1. Sensor sensing element; 2. Bracket; 3. Rotor
On the rear wheels: 4. Sensor sensing element; 5. Seal; 6. Bracket; 7. Rotor; N - the part must be replaced during assembly
Examination
1. Remove the sensor and gear rotor.
2. If the sensor pole piece is found to be damaged or coated with metal due to magnetic attraction, replace the sensor.
3. Check the resistance between the sensor leads. For front wheel sensors, the resistance should be 900-1100 ohms, rear wheel sensors - 1300-2100 ohms.
4. Sensor resistance to the body must be at least 100 kOhm.
5. Otherwise, replace the sensor.
6. Replace the sensor with visible damage.
7. Check the condition of the rotor teeth. Replace rotor with worn or broken teeth.
Removal and installation
Front wheel sensors
1. Disconnect the battery from the mass, raise the car and remove the wheel.
2. Disconnect the connector from the sensor, remove the brackets and remove the wiring.
3. Turn away 2 bolts on a rotary fist and carefully, without allowing collision, remove a magnetic part of the gauge from a fist.
4. Remove the wiring bracket.
5. Remove hub with disc (see subsection 9.3.12, subsection 9.3.13) and remove the sensor rotor by unscrewing the bolts.
6. Installation is carried out in the reverse order.
7. Maintain a gap of 0.2–1.0 mm between the sensor head and the rotor crown. If this gap is violated, check the correct installation of the rotor.
8. If the sensor has changed, then check the system in a car service.
Rear wheel sensors
1. Disconnect the battery from the mass, raise the car and remove the rear wheel.
2. Disconnect the connector on the rear suspension arm from the sensor, remove the brackets on the axle beam and remove the wiring.
3. Remove the 2 bolts on the brake shield and carefully remove the sensor sensing element and sealing rings.
4. Remove the half shaft (see subsection 9.4.1) and brake disc, remove the rotor and sensor bracket.
5. Installation is carried out in the reverse order.
6. Maintain a gap of 0.3–0.9 mm between the sensor head and the rotor crown. If this gap is violated, check the correct installation of the brake disc.
7. If the sensor has changed, then check the system in a car service.