DTC P2159: Vehicle Speed Sensor 'B' Range/Performance (Wheel Speed Sensor): General Description

The wheel speed sensor is the essential component that the ECM uses to calculate vehicle speed. This wheel speed sensor is the active hall-sensor type and good at temperature and noise characteristic. Digital wave is produced as tone wheel rotate according as hall sensor principle. Frequency of duty wave is changed in proportion to rotation of tone wheel and ECM gets vehicle speed through ABS/ESC control unit or the wheel speed sensor (In case of non-ABS/ESC vehicle).