Speedometer & Odometer
Vehicle Speed Sensor (VSS) produces voltage pulses of frequency proportional to vehicle speed. This signal is processed by Vehicle Control Module (VCM) to produce a voltage pulse signal to speedometer and odometer.
NOTE:
Incorrect VSS calibrator (integral to VCM) calibration may adversely affect operation of ABS, engine control system and cruise control system. If final drive or tire size is changed, VCM must be updated to match new tire size or final drive. Use scan tool manufacture's instructions to update VCM.