Component Location
General Description
The wheel speed sensor is the essential component the ABS ECU uses to calculate vehicle speed and to determine whether wheel lock occur
For example, rear wheel speed signal is used as a referecnce value, for vehicle speed, in front wheel drive vehicles, and if a difference between front and rear wheel speed occurs, then ABS control is performed.
Wheel speed sensor is active hall-sensor type.
DTC Description
The ABS ECU monitors the wheel speed sensor signal continuously.
If power supply of the WSS input amplifier is not normal or the ABS control cycle is continued abnormally,
if the exact fault location among 4 WSS can not be determined, This code is set.
DTC Detecting Condition
Item | Detecting Condition | Possible cause |
Case 1 | DTC Strategy | Interner motorning
| Improper installation of wheel speed sensor Abnormal Rotor and wheel bearing Faulty Wheel speed sensor |
MonitoringPeriod | Continueosly on driving
|
Enable Conditions | When continuous operation of ABS control to one (or over) wheel over 60s is detected.
|
Fail Safe | The ABS/EBD/ESP functions are inhibited.
The ABS/EBD/ESP warning lamps are activated.
|
Case 2 | DTC Strategy | Signal motoring
|
MonitoringPeriod | Continueosly on driving
|
Enable Conditions | If the following failure is detected caused by difference of wheel speed caused by airgap or missing teeth detection 1. FL/RL, FR/RR : 6~12kph(3.7~7.4mph), FL/FR : 10~16kph(6.2~12.4mph) Fault detection time : maximum 20s 2. FL/RL, FR/RR : >12kph(7.4mph), FL/FR : > 16kph(12.4mph) Fault detection time : maximum 10s 3. Fault detection time is maximum 80s when spin occurs on front wheel - Stop control right away if wheel speed senosor failure is detected during no control
|
Fail Safe | One or two wheel speed sensor fault - Only the ABS/ESP functions are inhibited. - The ABS/ESP warning lamps are activated and the EBD warning lamp is not activated.
More than 2 wheel speed sensor fault - The ABS/EBD/ESP functions are inhibited. - The ABS/EBD/ESP warning lamps are activated.
|
Specification
Sensor Type | Output Voltage | Air Gap |
HIGH | LOW |
Active Type | 1.4~2.0V | 0.7~1.0V | 0.4~1.2mm |
Diagnostic Circuit Diagram