Kia Optima: Automatic Transaxle Control System / Transaxle Oil Temperature Sensor (Main Harness)

Kia Optima DL3 2019-2020 Service and Repair Manual / Automatic Transaxle System / Automatic Transaxle Control System / Transaxle Oil Temperature Sensor (Main Harness)

Specifications
Specification

Item
Specification
Type
*NTC thermistor
Temp.[(°C)°F] / Resistance (kΩ)
(-40)-40 / 48.1
(-20)-4.0 / 15.6
(0)32.0 / 5.88
(20)68.0 / 2.51
(40)104.0 / 1.19
(60)140.0 / 0.61
(80)176.0 / 0.32
(100)212.0 / 0.18
(120)248.0 / 0.10
(140)284.0 / 0.06
(150)302.0 / 0.05

*NTC : Negative Temperature Coefficient

Description and operation
Description

The sensor used is a thermistor (NTC) in which resistance changes with temperature variation.

When the TCM supplies about 5 V of power to sensor, the sensor output value changes depending on ATF temperature.

Oil temperature sensor is installed on the valve body integrated with a main harness module.

Functions

Transaxle oil temperature sensor monitors the temperature of ATF and conveys the readings to TCM.

Data produced by this sensor is used to identify torque converter clutch activation and deactivation zones within the low temperature and high temperature range and to compensate hydraulic pressure levels during gear changes.

Components and components location
Components

1. Valve Body Cover
4. Main Connector
2. Main Harness
5. Speed Sensor Connector
3. Valve Body
6. Oil Temperature Sensor

Repair procedures
Inspection
1.

The automatic transaxle system can be more quickly diagnosed for troubles by using the vehicle diagnostic system (KDS). (Refer to "DTC guide")

KDS provides the following information.

(1)

Self diagnosis : Inspects and displays diagnostic trouble code (DTC)

(2)

Sensor data : Checks the system input/output value status

(3)

Forced operation : Checks the system operating status

(4)

Additional function : Controls system options, zero point adjustment and other functions

Component inspection
1.

Check the resistance by using the KDS.

Item
Specification
Temp.[(°C)°F] / Resistance (kΩ)
(-40)-40 / 48.1
(-20)-4.0 / 15.6
(0)32.0 / 5.88
(20)68.0 / 2.51
(40)104.0 / 1.19
(60)140.0 / 0.61
(80)176.0 / 0.32
(100)212.0 / 0.18
(120)248.0 / 0.10
(140)284.0 / 0.06
(150)302.0 / 0.05

Removal
  

Automatic transaxle is composed of delicate components. Be careful not to cause any damage on the component in the course of assembly and disassembly.

Maintain clean condition so that foreign substance does not get into the automatic transaxle.

Use a coated apron, latex gloves, and stainless tray to prevent foreign substance from getting into the transaxle.

1.

Remove the under cover.

(Refer to Engine Mechanical System - "Engine Room Under Cover")

2.

Remove the ATF drain plug (A), allow the fluid to drain out and then reinstall the drain plug.

Tightening torque:

33.3 - 43.1 N·m (3.4 - 4.4 kgf·m, 24.6 - 31.8 lb·ft)

  

The existing ATF drain plug gasket must be replaced with a new one. (Do not reuse it.)

Automatic transaxle fluid (ATF) can be reused. Collect it using a clean 10-liter beaker.

3.

Remove the air duct and air cleaner assembly.

(Refer to Engine Mechanical System - "Air cleaner")

4.

Remove the wiring bracket (A) and the air breather hose (B).

Tightening torque:

9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)

5.

Disconnect the hose (A) after removing the automatic transaxle fluid cooler hose clamp.

6.

Lift the vehicle after loosening valve body cover upper bolts.

7.

Remove the valve body cover (A) by loosening bolts.

Tightening torque:

11.8 - 13.7 N·m (1.2 - 1.4 kgf·m, 8.7 - 10.1 lb·ft)

8.

Remove the main harness (A) after removing the bolts.

Tightening torque:

9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)

9.

Remove the valve body assembly (A) after loosening the bolts.

Tightening torque:

9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)

10.

Disconnect the speed sensor connector (A).

11.

Loosen the main harness bolt (A).

Tightening torque :

9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)

12.

Disconnect the solenoid valve connector (A).

13.

Remove the solenoid valve connector mounting clip (A).

Tightening torque:

9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)

14.

Remove the solenoid valve connector (A) by pushing down from the transaxle.

Installation
1.

Install in the reverse order of removal.

  

Before installing the connector, apply the ATF to the O-ring.

The existing valve body cover gasket (A) must be replaced with a new one. (Do not reuse it.)

Check fluid level, after filling the automatic transaxle with fluid.

(Refer to Hydraulic System - "Fluid")

After installing, check for leakage of coolant or fluid from hose connection during engine start.

Transaxle Control Module (TCM)
Description and operation Description The module receives and processes signals from various sensors and implements a wide range of transaxle controls to ensure optimal driving conditi ...

Speed Sensor
Specifications Specification Item Specification Type Hall effect sensor Output voltage (V) High : 1.1 ...

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