As the transmission applies pressure to a section of the trans the oil pressure switch triggers.
If you mean a particular switch and what it tells the computer or what it controls I need more background info.
On a 2002 Jeep Liberty, the transmission fluid pressure switch is typically located on the transmission itself, specifically on the valve body. To access it, you may need to remove the transmission pan and filter. It's advisable to consult the vehicle's service manual for exact details and procedures, as components can vary slightly based on the engine and transmission type.
The starter solenoid is on the starter. Transmission solenoid is in or on the transmission.
If you have the same transmission as in my 2002 Jeep Grand Cherokee special edition it is located inside the transmission case which can be accessed by removing the lower pan in the transmission.
A 2002 Jeep Wrangler does not have a reset switch.
Just in front of crossmember, passenger side and near the bottom.
The 2002 Jeep Wrangler has a 5-speed manual.
There are no adjustments in the transmission on a Jeep Liberty.
A 2002 Jeep Liberty uses ATF+4.
The 2002 Jeep Grand-Cherokee has a 4-speed automatic.
That part filters the transmission fluid.
Remove the wiring harness from the 2003 Jeep Liberty pressure switch. Remove the power steering pressure switch retaining screws. Reverse the process to install the new power steering pressure switch.
How do you replace the safety neutral switch on a 1995 Jeep Cherokee 5-speed transmission and Where is the safety neutral switch located?