Kia Optima: Automatic Transaxle System

Service Data

Automatic Transmission

Item		Specification
Transaxle Model		A6MF1-2
Engineering Model		G 2.0 MPI (Gasoline)
Torque Converter Type		3-Element, 1-Stage, 2-Phase Type
Oil Pump Type		Megafluid
Component Element	Oil Filter	1 unit
	Grab	2 units
	One-Way Clutch	1 unit
	Brake	3 units
	Planetary Gear Set	3 units
	Fluid pressure balance piston	2 units
	Accumulator	4 units
	Solenoid valve	7 EA (*VFS: 6, ON/OFF: 1)

*VFS: Variable Force Solenoid

Inhibitor Switch

Item	Specification
Supply voltage (V)	4.5 - 5.5 V
Output type	Shift 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
	Output voltage (V)	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
	Output voltage (V)	Low: 0.59–0.84

*NTC: Negative Temperature Coefficient

Solenoid valve

Item		Specification
*T/CON_VFS	Control Type	N/L (Normally 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 (Normally Low)
	Control Pressure (kPa (kgf/cm², psi))	0–1 569,06 (0–16, 0–227,57)
	Current (mA)	0 - 1100
	Coil Resistance (Ω)	5,3 ± 0,3
*26/B_VFS	Control Type	N/L (Normally Low)
	Control Pressure (kPa (kgf/cm², psi))	0–1 569,06 (0–16, 0–227,57)
	Current (mA)	0 - 1100
	Coil Resistance (Ω)	5,3 ± 0,3
*UD/B_VFS	Control Type	N/H (Normally High)
	Control Pressure kPa (kgf/cm², psi)	0–1 569,06 (0–16, 0–227,57)
	Current (mA)	0 - 1100
	Coil Resistance (Ω)	5,3 ± 0,3
*OD/C_VFS	Control Type	N/H (Normally High)
	Control Pressure kPa (kgf/cm², psi)	0–1 569,06 (0–16, 0–227,57)
	Current (mA)	0 - 1100
	Coil Resistance (Ω)	5,3 ± 0,3
*Line_VFS	Control Type	N/H (Normally 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 Solenoid Valve-A

Solenoid Valve Operation Table

	CP	OD and LR	35 psi	26	C/S - A
P	●				●
N	●				●
1st		Δ			Δ
2nd		●		●
3rd position		●	●
4th
5th	●		●
6th	●			●
REV	●		●		●

● : Connection status

Δ : When vehicle speed is above 8 km/h

Clutch and Brake Table

	Grab			Brake
	OP/K	35R/S	OWC	LR/B	UD/B	26/B
N, P				●
1			●	Δ	●
2					●	●
3		●			●
4	●				●
5	●	●
6	●					●
R		●		●

● : Operating status

Δ : When vehicle speed is above 8 km/h

Tightening Torque

Item	N·m	kgf·m	lbf·ft
TCM Mounting Nut and Bolt	9,8 - 11,8	1,0 - 1,2	7,2 - 8,7
Shift cable bracket bolt	14,7 - 21,6	1,5 - 2,2	10,9 - 15,9
Shift Cable Bracket 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 speed sensor bolt	9,8 - 11,8	1,0 - 1,2	7,2 - 8,7
Output speed sensor bolt	9,8 - 11,8	1,0 - 1,2	7,2 - 8,7
Park/neutral position switch 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 bolt	11,8 - 13,7	1,2 - 1,4	8,7 - 10,1
Drain Plug	33,3 - 43,1	3,4 - 4,4	24,6 - 31,8
Torque converter bolt	45,1 - 52,0	4,6 - 5,3	33,3 - 38,3
Starter motor bolt	49,0 - 63,7	5,0 - 6,5	36,2 - 47,0
Automatic transmission upper mounting bolt (TM => Eng)	42,2 - 53,9	4,3 - 5,5	31,1 - 39,8
Automatic transmission lower mounting bolt (Eng => TM)	42,2 - 48,1	4,3 - 4,9	31,1 - 35,4
Automatic transmission lower mounting bolt (Eng => TM)	42,2 - 53,9	4,3 - 5,5	31,1 - 39,8
Automatic transmission support bracket bolt	58,9 - 78,5	6,0 - 8,0	43,4 - 57,8
Automatic transmission bracket bolt	107,9 - 127,5	11,0 - 13,0	79,6 - 94,0
Steering Rod Bracket Mounting Bolt	49,0 - 63,7	5,0 - 6,5	36,2 - 47,0
Steering Rod Bracket Mounting Bolt	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

Lubricants

Item	Capacity	Recommended
ATF (Automatic Transmission Fluid)	6.7 L (1.77 US gal, 7.08 US qt, 5.90 Imp qt)	ATF SP-IV KIA-approved transmission fluids: SK ATF SP-IV, MICHANG ATF SP-IV, NOCA ATF SP-IV, S-OIL ATF SP-IV

Special Service Tools

Tool Name/Number	Illustration	Description
Engine mount bracket (beam) 09200-3N000		Used to support the engine assembly when removing/installing the transaxle. ※ Refer to the illustration of the engine mount bracket installation below.
Engine Mount Bracket (Rear) 09200-L1100		Used to support the engine assembly when removing/installing the transaxle. ※ Refer to the illustration of the engine mount bracket installation below.
Engine Mount Bracket (Front) 09200-L1200		Used to support the engine assembly when removing/installing the transaxle. ※ Refer to the illustration of the engine mount bracket installation below.
Seal Installer A: 09452-26100 (Installer) B: 09231-H1100 (Handle)		Used to install the differential oil seal.
Inhibitor Switch Alignment Pin 09480-A3800		Used to hold the "N" range position when installing the inhibitor switch.

Engine Mount Bracket Assembly Drawing

Troubleshooting

Limp Home Mode

Has a fail-safe function that prevents hazardous situations in the event of a transaxle malfunction. The vehicle will operate in fail-safe mode if the transaxle malfunctions. In this mode, the transaxle operates at a minimum functional level (fixed gear, limited shifting, reverse, neutral), allowing the vehicle to reach a service center.

Troubleshooting

Symptom of Malfunction	Suspected Area	Remedy
Shift Delay, Shift Shock, Poor Acceleration	Clutch/brake damaged	Replace the brake or clutch.
	Faulty hydraulic control	Inspect the solenoid valve.
	Faulty hydraulic supply	Check the fluid level.
		Check fluid cleanliness.
		Replace the oil pump.
	TCM learning not performed	Perform TCM adaptive learning values.
Mechanical Fail-Safe Mode (locked in 4th gear, manual shifting disabled)	Faulty solenoid valve	Inspect the solenoid valve.
	Faulty solenoid valve	Replace the valve body.
	Faulty TCM	Replace the TCM.
	Faulty CAN communication	Inspect the CAN communication line.
Limp Home Mode (locked in 4th gear, manual shift 2nd to 4th enabled)	Faulty input and output speed sensor	Replace the input and output speed sensors.
Sluggish Limp-Home Mode (1st to 3rd shift disabled, 4th to 6th shift enabled)	Faulty lock switch	Replace the inhibitor switch.
Manual shift disabled	Faulty TCM	Replace the TCM.
	Faulty connector connection	Check the manual mode connector connection.
	Faulty manual mode switch	Replace the manual mode switch housing.

Automatic Transmission

Service Data

Service Data

Tightening Torque

Tightening Torque

Lubricants

Lubricants

Special Service Tools

Special Service Tools

Troubleshooting

Troubleshooting

Limp Home Mode

Test yourself