Vehicle Speed Sensor: Testing and Inspection

Diagnosis of Vehicle Speed Sensor

The vehicle speed signal is derived from the ABS wheel speed sensor and is made available via CAN to the ECU.

Rationality check
Provided no ABS and /or CAN related faults are present, the vehicle speed signal will be checked against an upper threshold. Exceeds the VS signal the upper threshold the error counter will be incremented. Exceeds the error counter the threshold the failure management will be triggered.