Kia Optima: Automatic Transaxle System / Automatic Transaxle System

Kia Optima DL3 2019-2025 Service and Repair Manual / Automatic Transaxle System / Automatic Transaxle System

Components and components location

Components

1. Transaxle Support Braket	5. Roll Rod Support Bracket
2. Driveshaft Assembly [RH]	6. Sub Frame
3. Driveshaft Assembly [LH]	7. Driveshaft Heat Protector
4. Roll Rod Bracket	8. Automatic Transaxle Assembly

Repair procedures

Removal

1.	Remove the air cleaner assembly. (Refer to Engine Mechanical System - "Air cleaner")

2.	Remove the battery and battery tray. (Refer to Engine Electrical System - "Battery")

3.	Disconnect the main connector (A) and inhibitor switch connector (B).

4.	Remove the wiring fixing clips (A) from the brackets.

Remove the wiring protector (A) by loosening the bolt.

Tightening torque :

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

Remove the shift cable (B) after loosening the nut (C) and bolts (A).

Tightening torque :

(A) 14.7 - 21.6 N·m (1.5 - 2.2 kgf·m, 10.9 - 15.9 lb·ft)

Remove the ground line after removing the bolt (A).

Tightening torque :

26.5 - 32.4 N·m (2.7 - 3.3 kgf·m, 19.5 - 23.9 lb·ft)

8.	Separate the ATF cooler hose (A).

Loosen the starter mounting bolt (A) and transaxle mounting bolts (B).

Tightening torque :

(A): 49.0 - 63.7 N·m (5.0 - 6.5 kgf·m, 36.2 - 47.0 lb·ft)

(B): 42.2 - 53.9 N·m (4.3 - 5.5 kgf·m, 31.1 - 39.8 lb·ft)

10.	Assemble the engine support fixture on the engine room. (Refer to Special Service Tools - "Engine support fixture assembly drawing")

11.	Remove the under cover. (Refer to Engine Mechanical System - "Engine Room Under Cover")

12.	Support the transaxle safely with a jack.

13.	Remove the cover (A).

14.

Remove the automatic transaxle support bracket mounting bolts (A).

Tightening torque :

107.9 - 127.5 N·m (11.0 - 13.0 kgf·m, 79.6 - 94.0 lb·ft)

15.

Remove the automatic transaxle support bracket (A).

Tightening torque :

58.8 - 78.5 N·m (6.0 - 8.0 kgf·m, 43.4 - 57.9 lb·ft)

16.	Remove the drive shaft assembly. (Refer to Driveshaft and Axle - "Front Driveshaft")

17.	Remove the sub frame. (Refer to Suspension System - "Sub Frame")

18.

Remove the roll rod support bracket (A).

Tightening torque :

49.0 - 68.6 N·m (5.0 - 7.0 kgf·m, 36.2 - 50.6 lb·ft)

19.

Remove the heat protector (A) by loosening the bolt.

Tightening torque :

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

20.

Remove the dust cover (A).

Tightening torque :

42.2 - 48.1 N·m (4.3 - 4.9 kgf·m, 31.1 - 35.4 lb·ft)

21.

Remove the torque converter mounting bolts (A) by rotating the crankshaft in the clockwise.

Tightening torque :

45.1 - 52.0 N·m (4.6 - 5.3 kgf·m, 33.3 - 38.3 lb·ft)

22.	Support the transaxle safely with a jack.

23.

Loosen the starter lower mounting bolt (A).

Tightening torque :

49.0 - 63.7 N·m (5.0 - 6.5 kgf·m, 36.2 - 47.0 lb·ft)

24.

Loosen the transaxle lower mounting bolts (A, B).

Tightening torque :

(A) 42.2 - 48.1 N·m (4.3 - 4.9 kgf·m, 31.1 - 35.4 lb·ft)

(B) 42.2 - 54.0 N·m (4.3 - 5.5 kgf·m, 31.1 - 39.8 lb·ft)

25.

After separating the transaxle from the engine, remove the transaxle by lowering the jack slowly.

Be careful not to damage other nearby systems or parts when removing the transaxle assembly.

Installation

Install in the reverse order of removal.

•	Matters that require attention when installing the transaxle to engine

1)	Check that there is no gap between the torque converter housing (A) and the engine block (B).

2)	This gap means the torque converter is not assembled correctly and it can cause damage on the key (A) of oil pump gear. In this case, reinstall the torque converter correctly after removing the transaxle assembly.

3)	If the bolt is tightened while there is a gap, it can cause damage on the key of oil pump gear. In this case, replace the transaxle assembly after loosening the mounting bolts.

•	When reinstalling

1)	If the differential oil seal is damaged and oil is leaking, replace the oil seal with a new one. When installing a new oil seal, use the SSTs (09452-26100, 09231-H1100).

2)	Check that the shift lever and manual control lever are placed in the "N" position.

3)	Check the ATF level after refilling the automatic transaxle with fluid.

4)	Clear the diagnostic trouble codes (DTC) using the KDS. Disconnecting the battery negative terminal will not clear the DTCs. Clear DTCs using the KDS at all times.

•	When replacing with a new automatic transaxle

1)	Check that the shift lever and manual control lever are placed in the "N" position.

2)	Automatic transaxle is already filled with the specified amount of ATF. For this reason, it is not necessary to refill and check the ATF. However, the remaining ATF in the ATF cooler has to be drained.

3)	Install the transaxle after draining the remaining ATF by blowing air into the ATF cooler hose.

4)	Clear the diagnostic trouble codes (DTC) using the KDS. Disconnecting the battery negative terminal will not clear the DTCs. Clear DTCs using the KDS at all times.

5)	Reset the automatic transaxle adaptive values using the KDS.

6)	Perform the oil pressure characteristics input procedure using the KDS.

7)	Perform the TCM adaptive values learning procedure. (Refer to Automatic Transaxle Control System - "Repair procedures")

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