Kia Optima Hybrid: Automatic Transaxle Control System / Transaxle Oil Temperature Sensor Repair procedures

Inspection
1.
Turn ignition switch OFF.
2.
Remove the air duct (A).

Tightening torque:
7.8 ~ 9.8 N.m (0.8 ~ 1.0 kgf.m, 5.8 ~ 7.2 lb-ft)

3.
Remove the air cleaner assembly.
(1)
Disconnect the breather hose (A).
(2)
Disconnect the air intake hose (B) and then remove the air cleaner assembly (C).

Tightening torque:
Hose clamp bolt:
2.9 ~ 4.9 N.m (0.3 ~ 0.5 kgf.m, 2.2 ~ 3.6 lb-ft)
Air cleaner assembly bolts:
7.8 ~ 9.8 N.m (0.8 ~ 1.0 kgf.m, 5.8 ~ 7.2 lb-ft)

   
When installing the air intake hose, the plate of the hose clamp must be in line with the stopper of the hose.
When installing the air intake hose, the center of the mark of hose must be in line with the throttle body rib.

4.
Remove the solenoid valve connector (A).

5.
Measure resistance between sensor signal terminal and sensor ground terminal.
6.
Check that the resistance is within the specification.
Removal
   
Be sure to read and follow the “General Safety Information and Caution” before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries.
Be sure to shut off the high voltage circuit according to the “High Voltage Shut-off Procedures” before doing any work related with the high voltage system to avoid serious electrical injuries.
1.
Change the shift lever to "N" range.
2.
Remove the valve body assembly.
(Refer to Hydraulic System - "Valve Body")
3.
Disconnect the input & output speed sensor connector (A).
4.
Loosen the main connector bolt (B).

Tightening torque :
9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)

5.
Disconnect the solenoid valve connector (A).

6.
Remove the solenoid valve connector clip (B) after loosening a bolt and then remove the connector (A) by pushing down to it.

Installation
1.
Install in the reverse order of removal.
   
Do not reuse the drain plug gasket and the valve body cover gasket, oil cooler tube washer.
Perform the procedures below after installing
1)
Refill the automatic transaxle with fluid.
(Refer to Hydraulic System - "Fluid")
2)
Refill the engine & transaxle cooling system with coolant.
(Refer to Engine Mechanical System - "Coolant")
3)
Refill the hybrid motor cooling system with coolant and then perform the air bleeding using the GDS.
(Refer to Hybrid Motor System - "Coolant")
4)
Reset the automatic transaxle adaptive values using the GDS.
5)
Confirm the coolant leak or fluid leak from the hose connections part in state of engine start.
Transaxle Oil Temperature Sensor Schematic Diagrams

Circuit Diagram ...

Input Speed Sensor Description and Operation

Description Input speed sensor is a vital unit that measures the rate of rotation of the input shaft inside the transaxle and delivers the readings to the TCM. The sensor provides critical input data that''s ...

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