2. Pull the lock in the direction of the arrow shown in Figure 15.74 and disconnect the connector from the control unit.
Fig. 15.74. Disconnecting the connector from the control unit
3. To measure the output voltage of the wheel speed sensor, use a special tool connected to the contacts of the disconnected connector (Fig. 15.75).
Fig. 15.75. Using a special tool to measure the output voltage of the wheel speed sensor
4. Rotate the wheel at a frequency of 1/2-1 revolution per second using a voltmeter or oscilloscope to measure the output voltage of the wheel speed sensor.
Wheel speed sensor output voltage
| Wheel speed sensor | Measuring the voltage between the connector contacts |
| Front left | 6-7 |
| Front right | 4-5 |
| Rear left | 8-9 |
| Rear right | 1-3 |
5. Output voltage:
- when measured with a voltmeter: not less than 50 mV
- when measured with an oscilloscope: not less than 120 mV
If the output voltage is lower than required, the wheel speed sensor may be faulty and needs to be replaced.