Transmission Range Switch

Transmission Range Switch
The four inputs from the transmission range switch indicate to the PCM which position is selected by the transmission selector lever. This information is used for ignition timing, EVAP canister purge, EGR operation.

For more information on the transmission on the transmission range switch, refer to 4L30-E Automatic Transmission section.

The PCM determines the speed of the vehicle by converting a plusing voltage signal from the vehicle speed sensor (VSS) into miles per hour. The PCM uses this signal to operate the cruise control, speedometer, and the TCC and shift solenoids in the transmission. For more information on the TCC and shift solenoids, refer to 4L30-E Automatic Transmission section.