Kia Optima: Automatic Transaxle System

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

Service data
Service data

Automatic Transaxle

Item
Specification
Transaxle model
A6MF1-2
Engine model
G 2.0 MPI (Gasoline)
Torque converter type
3-element, 1-stage, 2-phase type
Oil pump type
Megafloid
Component element
Oil filter
1 unit
Clutch
2 units
One-way clutch
1 unit
Brake
3 units
Planetary gear
3 units
Fluid pressure balance piston
2 units
Accumulator
4 units
Solenoid valve
7 units (*VFS: 6, ON/OFF: 1)

*VFS: Variable Force Solenoid

Inhibitor Switch

Item
Specification
Power supply (V)
4.5 - 5.5 V
Output type
Shifting range (P/R/N/D)
Non-contact (2 channel PWM signal)
Start, Back-up lamp
Contact

Sensor

Item
Specification
Oil temperature sensor
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
Input speed sensor
Type
Hall effect sensor
Operating condition (°C)°F
(-40 to 150)-40 to 302
Output voltage (V)
High: 1.18 - 1.68
Low: 0.59 - 0.84
Output speed sensor
Type
Hall effect sensor
Operating condition (°C)°F
(-40 to 150)-40 to 302
Output voltage (V)
High: 1.18 - 1.68
Low: 0.59 - 0.84

*NTC: Negative Temperature Coefficient

Solenoid Valve

Item
Specification
*T/CON_VFS
Control type
N/L (Normal Low)
Control pressure kPa (kgf/cm², psi)
0 - 519.75 (0 - 5.3, 0 - 75.38) 
Current (mA)
0 - 850
Coil resistance (Ω)
5.1 ± 0.3
*35R/C_VFS
Control type
N/L (Normal Low)
Control pressure (kPa (kgf/cm², psi))
0 - 1,569.06 (0 - 16, 0 - 227.57) 
Current (mA)
0 - 1,100 
Coil resistance (Ω)
5.3 ± 0.3
*26/B_VFS
Control type
N/L (Normal Low)
Control pressure (kPa (kgf/cm², psi))
0 - 1,569.06 (0 - 16, 0 - 227.57) 
Current (mA)
0 - 1,100 
Coil resistance (Ω)
5.3 ± 0.3
*UD/B_VFS
Control type
N/H (Normal High)
Control pressure kPa (kgf/cm², psi)
0 - 1,569.06 (0 - 16, 0 - 227.57) 
Current (mA)
0 - 1,100 
Coil resistance (Ω)
5.3 ± 0.3
*OD/C_VFS
Control type
N/H (Normal High)
Control pressure kPa (kgf/cm², psi)
0 - 1,569.06 (0 - 16, 0 - 227.57) 
Current (mA)
0 - 1,100 
Coil resistance (Ω)
5.3 ± 0.3
*Line_VFS
Control type
N/H (Normal High)
Control pressure kPa (kgf/cm², psi)
0 - 519.75 (0 - 5.3, 0 - 75.38) 
Current (mA)
0 - 850
Coil resistance (Ω)
5.1 ± 0.3
*SS-A_ON/OFF
Control type
ON/OFF
Voltage (V)
9 - 16 
Control pressure kPa (kgf/cm², psi) 
0 - 490.33 (0 - 5.0, 0 - 71.12)
Coil resistance (Ω)
10.0 - 11.0

*T/CON_VFS: Torque converter control solenoid valve

*35R/C_VFS: 35R clutch control solenoid valve

*26/B_VFS: 26 Brake control solenoid valve

*UD/B_VFS: Underdrive brake control solenoid valve

*OD/C_VFS: Overdrive clutch control solenoid valve

*LINE_VFS: Line pressure control solenoid valve

*SS-A_ON/OFF: Shift control solenoid valve-A

Solenoid Valve Operation Table


UD
OD & LR
35 R
26
SS - A
P





N





1 st

Δ


Δ
2 nd





3 rd





4 th





5 th





6 th





REV






● : Connection status

Δ : Connected with vehicle speed above 8km/h (5mph)

Clutch & Brake Operation Table


Clutch
Brake
OD/C
35R/C
OWC
LR/B
UD/B
26/B
N, P






1



Δ


2






3






4






5






6






R







● : Operation status

Δ : Connected with vehicle speed above 8km/h (5mph)

Tightening torque
Tightening Torque

Item
 N·m
kgf·m 
 lb·ft
TCM mounting nut & bolt
9.8 - 11.8
1.0 - 1.2
7.2 - 8.7
Shift cable bracket mounting bolt
14.7 - 21.6
1.5 - 2.2
10.9 - 15.9
Shift cable retainer mounting nut
9.8 - 14.7
1.0 - 1.5
7.2 - 10.9
Shift cable mounting nut
9.8 - 14.7
1.0 - 1.5
7.2 - 10.9
Shift lever assembly mounting bolt
8.8 - 13.7
0.9 - 1.4
6.5 - 10.1
Input shaft speed sensor mounting bolt
9.8 - 11.8
1.0 - 1.2
7.2 - 8.7
Output shaft speed sensor mounting bolt
9.8 - 11.8
1.0 - 1.2
7.2 - 8.7
Inhibitor switch mounting bolt
9.8 - 11.8
1.0 - 1.2
7.2 - 8.7
Manual control lever mounting bolt
17.7 - 24.5
1.8 - 2.5
13.0 - 18.1
Valve body cover mounting bolt
11.8 - 13.7
1.2 - 1.4
8.7 - 10.1
Fluid drain plug
33.3 - 43.1
3.4 - 4.4 
24.6 - 31.8
Torque converter mounting bolt
45.1 - 52.0
4.6 - 5.3
33.3 - 38.3
Starter mounting bolt
49.0 - 63.7
5.0 - 6.5
36.2 - 47.0
Automatic transaxle upper mounting bolt (TM=>Eng)
42.2 - 53.9
4.3 - 5.5
31.1 - 39.8
Automatic transaxle lower mounting bolt (Eng=>TM)
42.2 - 48.1
4.3 - 4.9
31.1 - 35.4
42.2 - 53.9
4.3 - 5.5
31.1 - 39.8
Automatic transaxle support bracket mounting bolt
58.9 - 78.5
6.0 - 8.0
43.4 - 57.8
Automatic transaxle mounting bracket bolt
107.9 - 127.5
11.0 - 13.0
79.6 - 94.0
Roll rod bracket mounting bolt
 49.0 - 63.7
5.0 - 6.5
36.2 - 47.0
107.9 - 127.5
11.0 - 13.0
79.6 - 94.0
Roll rod support bracket mounting bolt
49.0 - 68.6
5.0 - 7.0
36.2 - 50.6
Torque converter housing mounting bolt
27.5 - 34.3
2.8 - 3.5
20.3 - 25.3
Oil filter mounting bolt
9.8 - 11.8
1.0 - 1.2
7.2 - 8.7
Oil pump mounting bolt
19.6 - 25.5
2.0 - 2.6
14.5 - 18.8

Lubricant
Lubricants

Item
Capacity
Recommended 
ATF (Automatic Transaxle Fluid)
6.7 L (1.77 U.S gal., 7.08 U.S.qt., 5.90 Imp.qt.)

ATF SP-Ⅳ

The list of transaxle fluid approved by KIA: SK ATF SP-IV, MICHANG ATF SP-IV, NOCA ATF SP-Ⅳ, S-OIL ATF SP-IV


Special service tools
Special Service Tools

Tool Name / Number
Illustration
Description
Engine support fixture (bar)
09200-3N000

Used for holding engine assembly when removing / installing transaxle
※ Refer to the engine support fixture assembly drawing below.
Engine support fixture (Rear supporter)
09200-L1100

Used for holding engine assembly when removing / installing transaxle
※ Refer to the engine support fixture assembly drawing below.
Engine support fixture (Front supporter)
09200-L1200

Used for holding engine assembly when removing / installing transaxle
※ Refer to the engine support fixture assembly drawing below.
Oil seal installer
A : 09452-26100 (Installer)
B : 09231-H1100 (Handle)

Used for installing differential oil seal
Inhibitor switch guide pin
09480-A3800

Used for fixing "N" range when installing inhibitor switch

Engine support fixture assembly drawing

Troubleshooting
Troubleshooting
Limp Home Mode

Features a fail-safe function that prevents dangerous situations in the event of a transaxle failure. The vehicle will be driven in limp home mode if the transaxle malfunctions. In this mode, the transaxle operates at a minimal functionality level (fixed shifting, limited shifting, reverse, neutral), making it possible for the vehicle to reach a service center.

  

Limp Home Mode : Limited shifting

Mechanical limp home mode : Fixed shifting (failure of mechanical parts, solenoid valves, TCM, CAN communication)

Troubleshooting

Trouble symptom
Suspected area
Remedy
Shifting delay, Shifting shock, Poor acceleration
Damaged clutch / brake
Replace the brake or clutch.
Faulty hydraulic control
Inspect the solenoid valve.
Faulty hydraulic supply
Inspect the fluid level.
Inspect the fluid cleanliness 
Replace the oil pump.
TCM learning not performed
Perform the TCM adaptive value learning.
Mechanical limp home mode
(locked into 4th, manual shifting disabled)
Faulty Solenoid valve
Inspect the solenoid valve.
Replace the valve body.
Faulty TCM
Replace the TCM.
Faulty CAN communication
Inspect the CAN communication line.
Limp home mode
(locked into 4th, manual shifting 2nd-4th enabled)
Faulty input & output speed sensor
Replace the input & output speed sensor.
Limp home mode
(1st-3rd shifting disabled, 4th-6th shifting enabled)
Faulty inhibitor switch
Replace the inhibitor switch.
Manual shifting disabled
Faulty TCM
Replace the TCM.
Faulty connector connection
Check the connection of manual mode connector.
Faulty manual mode switch
Replace the manual mode switch housing.

Injector
Specifications Specification Item Specification Coil Resistance (Ω) 14.5 [20°C(68°F)] Description and operation ...

Automatic Transaxle Control System
Description and operation Description Automatic transaxle control system relies on various measurements to determine the current control status and determine the necessary compensation ...

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