Pinion Factor Procedure

The vehicle speed readings for the speedometer are taken from the output speed sensor. The TCM. must be calibrated to the different combinations of equipment available. A procedure has been developed called Pinion Factor. It allows the technician to set the Transmission Control Module initial setting so that the speedometer readings will be correct.

Failure to perform this procedure will cause a No Speedometer Operation condition.
This procedure must be performed if the TCM has been replaced.

To properly read or reset the Pinion Factor, it is necessary to use a DRBIII scan tool. Perform the following steps with the DRBIII scan tool to read or reset the Pinion Factor:
1. Plug the DRBIII scan tool into the DLC located under the instrument panel.
2. Select the Transmission menu.
3. Select the Miscellaneous menu.
4. Select Pinion Factor. Then follow the instructions on the DRBIII scan tool screen.