Electronic Pinion Factor
ELECTRONIC PINION FACTORThe Vehicle Speed Sensor (VSS) supplies distance pulses to the Powertrain Control Module (PCM), which are used to calculate speed and mileage. A pinion factor is stored in the Transmission Control Module (TCM) in order to provide the appropriate distance pulses for the vehicle. The pinion factor is programmed into the TCM at the assembly plant.
Warning: The pinion factor must be set for all new transmission control modules. If the pinion factor is not set or if it is set incorrectly, any speed-related accessories will not operate or will operate inaccurately. This includes the speedometer, speed control, rolling door locks, and other devices that are operated by the powertrain and body control modules.