Kia Optima: Output Speed Sensor. Description and OperationDescription
The output speed sensor is a vital unit that measures the rate of rotation of the transaxle's turbine shaft and output shaft, and delivers the readings to the TCM. The sensor provides critical input data that's used in feedback control, damper clutch control, gear setting control, line pressure control, clutch activation pressure control, and sensor fault analysis.

Installation
Output Speed Sensor. SpecificationsReplacement
Standard values, such as torques and certain adjustments, must be strictly
observed in the reassembly of all parts.If removed, the following
parts should always be replaced with new ones.
...
Removal and Installation
1.
Disconnect the battery negative terminal first, then
the positive terminal.
Tightening torque
:(+) terminal : 7.8 ~ 9.8N.m (0.8 ~ 1.0kgf.m,
5.8 ~ 7.2l ...
Operation
Passive FunctionsThe system allows the user to access the vehicle without having
to perform any actions (e.g. RKE button pressing) with the SMART KEY FOB. It is
sufficient that a valid SMART KEY F ...