Check TCM

Ignition "ON" & Engine "OFF".
Connect "TRANSAXLE FLUID TEMPERATURE SENSOR" connector.
Install scantool and select a SIMU-SCAN,
Simulate voltage (0→5V) to "TRANSMISSION FLUID TEMPERATURE SENSOR" signal circuit.

Fig 1: Scantool Display - Simulation Voltage Of Transmission Fluid Temperature Sensor (Input 1.00V)
Courtesy of KIA MOTORS AMERICA, INC.

Fig 2: Scantool Display - Simulation Voltage Of Transmission Fluid Temperature Sensor (Input 2.00V)
Courtesy of KIA MOTORS AMERICA, INC.
Is FLUID TEMP. SENSOR signal value changed according to simulation voltage?
YES
1. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
1. Substitute with a known-good PCM/TCM and check for proper operation. If the problem is corrected, replace PCM/TCM as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.