Kia Optima: Automatic Transaxle Control System / Speed Sensor

Kia Optima DL3 2019-2020 Service and Repair Manual / Automatic Transaxle System / Automatic Transaxle Control System / Speed Sensor

Specifications
Specification

Item
Specification
Type
Hall effect sensor
Output voltage (V)
High : 1.18 - 1.68
Low : 0.59 - 0.84

Description and operation
Description
Input Speed Sensor

Input speed sensor (A) and output speed sensor (B) are integrated and installed in the transaxle.

Speed sensor uses an electric current type hall sensor in which the current is changed by the magnetic variation.

The sensor provides critical input data used in feedback control, engine clutch control, gear setting control, line pressure control, clutch activation pressure control, and sensor fault analysis.

Components and components location
Components

1. Valve Body Cover
4. Output Speed Sensor
2. Main Harness
5. Input Speed Sensor
3. Valve Body


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 sensor waveform with KDS.

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 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.

Remove the speed sensor (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)

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.

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