General Information

ABS/ESC
C1202 Wheel Speed Sensor Front-LH Invalid/no Signal - General Information

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 occurs.
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.
This code is set when there is no wheel speed signals within 10 ms to 20 ms at a vehicle speed > 43.2 km/h or a deviation between sensors exceed the threshold or one or two wheels are at 2.75km/h while the vehicle speed is at 12 km/h.
Warning lamp is turned OFF unless additional faults are detected when the IG KEY is turned ON again, and wheel speed is more than 12 Km/h.

DTC Detecting Condition














Specifications





Diagnostic Circuit Diagram





Signal Waveform & Data




Fig.1) Normal waveform of wheel speed sensor with low speed conditon