Checking sensors
Check the protrusion on the edge of the sensor for dirt and damage. Replace sensor if damaged.
Check the resistance between the sensor terminals. Normal value: 0.9-1.3 kΩ. If the resistance is out of range, replace the sensor.
Clean the sensor thoroughly. Check for open circuit between sensor housing and terminals. If the circuit is open, replace the sensor.
Check sensor wiring for damage.
Checking the rotors
Check the rotor teeth for damage and deformation. If there are deformed or damaged teeth, replace the drive shaft assembly (on the front wheels) or rotor (on rear wheels).