The Wheel Speed Sensors (WSS)are an essential component the ABS system. The WSS signals are used to calculate vehicle speed and to determine whether wheel lock occurs.
The Wheel Speed Sensors are active hall-sensor type.
If the sensor signal is out of the specified range for 140msec, the HECU determines that the circuit is open/short, and sets this code.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Current Monitoring | 1. Open or short of Wheel speed sensor circuit 2. Faulty Wheel speed sensor |
Enable Conditions |
•
When the sensor signal current is continuously out of the specified range of 4 mA ± 10% ~ 22 mA ± 10% for 140msec. | |
Fail Safe | 1) Only one wheel failure : Inhibit the ABS/ESP/DBC control, allow the EBD control. The ABS/ESP/DBC warning lamps are activated, the EBD warning lamp is not activated. 2) More than two wheels failure : The ABS/EBD/ESP/DBC functions are inhibited. The ABS/EBD/ESP/DBC warning lamps are activated. |
Sensor Type | Output Voltage | Air Gap | ||
HIGH | LOW | |||
Active Type | 1.4V | 0.7V | 0.4~1.5mm | |
Fig 1) Normal waveform of wheel speed sensor with low speed conditon
