2. Turn the ABS-ECU connector lock lever downward and disconnect the A-01 connector.
3. Connect a voltmeter or oscilloscope to the connector (not to the ABS-ECU unit) and, rotating the wheels by hand at a speed of 0.5-1 revolution per second, measure the output voltage. It should be:
- 42 mV or higher when using a multimeter;
- 120 mV peak-to-peak or higher when using an oscilloscope.
If the voltage is lower, check the gap between the sensor and the rotor. If the gap is normal, replace the sensor.
Using an oscilloscope, based on the waveform, you can draw conclusions about the state of the sensor and other elements of the ABS system. To do this, turn on the engine, engage first gear (manual transmission) or switch the selector lever to position D (automatic transmission). It is also allowed to read data from the oscilloscope while driving. In this case, the output voltage should increase with faster movement and decrease with slower speed.
 |  |
| Wave form | Probable cause | Solution |
| Too small amplitude | Faulty speed sensor | Replace the sensor |
| Excessive amplitude fluctuations (if the smallest amplitude does not exceed 10 OhmV) | Skewed or worn hub axle | Replace the hub |
| Faulty grounding of the ABS-ECU unit | Repair the wiring | |
| Uneven wave shape | Open circuit in speed sensor | Replace the sensor |
| Open circuit in wiring | Fix the wiring | |
| Incorrectly installed wheel speed sensor | Reinstall correctly | |
| Damaged rotor tooth | Replace ABS rotor |
Note: Since the wheel speed sensor wires move with the front or rear suspension, there is a possibility that the circuit may open only when driving on rough roads; therefore, it is recommended to check the sensor output voltage under rough road conditions.
In case of battery discharge
If, in the case of a discharged battery, you jump-start the engine and start driving without waiting for the battery to recharge, the engine may misfire and stop. This happens because the ABS system requires a lot of energy for self-diagnosis when turned on. To solve this problem, fully recharge the battery.