This document provides technical specifications and operating details for various Hyundai transaxle models, including the M5EF2, A4CF0, M5CF1, and A4AF3. It describes the main features of each model such as structure, gear ratios, clutch and brake components. It also provides details on solenoid valve operation for shifting and failure modes which result in the transmission defaulting to 3rd gear. The document aims to communicate the key technical details and functions of Hyundai automatic transaxle systems to transmission engineers.

1. Copyright by Hyundai Motor Company. All rights reserved.
M5EF2, A4CF0

2. 2Transaxle
TM Variation
Engine T/M Area
Model
Volume
[cc]
[PS/kg.m] M/T A/T India Europe General
ε-1.1
(G4HG)
1,086 64/9.9
M5EF2 A4CF0
●
(’07.10)
●
(’07.12)
●
(’07.12)
κ-1.2
(G4LA)
*1,248 77/11.8 -
●
(‘08.9)
●
(‘08.10)
1,197 77/11.2
●
(‘08.9)
- -
U-1.1
(U3FA)
1,120 75/15.5 M5CF1 - -
●
(‘07.12)
-
* It is also called referred to as ‘κ-1.25’ to identify with 1,197cc.

3. 3Transaxle
M/T Main Features
Items PA MXI PA
Model
Engine ε- 1.1 /κ-1.2 ε- 1.0 / 1.1 U - 1.1
M/T code M5EF2 M5EF1 M5CF1
Torque (kgf-m) 12.5 10.0 15.5
Shaft distance (mm) 172 165 189
Length (mm) 347 352.2 378
Weight (kg, dry) 30 24.3 41.6

4. 4Transaxle
M/T Comparison
Items PA MXI PA
Structure
Case 2 pcs. (C/HSG+T/CASE) 3 pcs. (C/HSG+T/CASE+R/COVER) 2 pcs. (C/HSG+T/CASE)
Shift control CABLE type ROD type CABLE type
Synchro.
1st
: Single cone carbon ring,
2nd
: Double cone,
3rd
~ 5th
: Single cone
All : Single cone
1st
~ 3rd
: Double cone,
4th
~ 5th
: Single cone,
R : Anti-Vibration mech.
Clutch Manual Manual Hydraulic
Oil Low viscosity & permanent Permanent Low viscosity & permanent

5. 5Transaxle
Single carbon ring
M5EF2 Main Features
Double cone synchronizer
Return spring
Manual cable type clutch
(push type)

6. 6Transaxle
A4CF0 Internal Structure
Reverse clutchO/D clutch 2nd
brake
LR brake
U/D clutch
OWC
Output planetary
gear
O/D planetary gear

7. 7Transaxle
A4CF0 Main Features
2nd
brake LR brakeReaction
plate
2nd
brake LR brakeReaction
plate
A4CF0 A4CF1, 2

8. 8Transaxle
A4CF0 Main Features
Flat torque
converter
Changed bearing type
Reduced oil pump capacity than
A4CF1&2
Reduced number of disc
Reduced U/D clutch
A4CF1&2: Taper roller bearing
A4CF0: Ball bearing
The parts of decreased size :
- Overall length
- O/D carrier, O/P carrier
- Input shaft, Output shaft

9. 9Transaxle
Items A4CF0 A4CF1 A4CF2 A4AF3 (MC)
Engine Ε-1.1, Κ-1.2 Γ-1.6 Β-II 2.0 U 1.6 Alpha II
Torque (kg ㆍ m) 12.5 15.5 24 14.6
Number of OWC 1 ← ← ← ←
Number of Clutch 3 ← ← ← ←
Number of Brake 2 ← ← ← ←
Centrifugal
Balance
Chamber
3
(UD, OD, Reverse Clutch)
1
(Frt. Clutch)
Accumulator 4(UD,OD,2nd
,LR) 1
Solenoid valves
6
(PWM-5, VFS-1)
6
(On,Off-3, PWM-3)
Gear Shift Position
6 with
O/D switch
7 Modes (P,R,N,D,3,2,1)
6 with
O/D switch
Specification

10. 10Transaxle
Shift lever & Cluster
6 positions with the
momentary type O/D OFF
switch
No indicator for A/T shift range
(P, R, N, D, 2, L) in the cluster

11. 11Transaxle
Valve Body
•Valve body and spool valve are
from Alloy
• Full line pressure control
• Individual Clutch to Clutch Control
* To remove the valve body,
- A type (6x30mm) : 17EA
- B type (6x35mm) : 1EA
- C type (6x40mm) : 1EA
- D type (6x55mm) : 1EA
- E type (6x60mm) : 1EA
C
E D
B (except A4CF0)A X 17EA
Valve body mounting bolt location

12. 12Transaxle
PCSV - A : O/D or LR Solenoid
PCSV - B : 2nd
or REV Solenoid
PCSV - C : UD Solenoid
PCSV - D : Damper Clutch Solenoid
On/Off Sol V/V : Switching PCSV – A from LR to O/D
(Switch on – LR engaged, off- O/D engaged)
VFS Solenoid
Solenoid Valve
* Each solenoid can be interchangeable except VFS (Variable Force Solenoid)

13. 13Transaxle
Solenoid Valve Current Control
VFS
PCSV & SCSV

14. 14Transaxle
ⓐ UD (two springs
with white color)
ⓑ OD (one spring
with yellow color)
ⓒ 2nd
(two springs
with yellow color)
ⓓ L/R (one spring
with yellow color)
Accumulator
* Each Spring can be interchangeable except white one
ⓐ
ⓑ
ⓒ
ⓓ

15. 15Transaxle
* Totally 8 checking ports are used.
- UD : UD Clutch - RED : Reducing Pressure
- L/R : L/R Brake - O/D : O/D Clutch
- DA : Damper Clutch Apply - 2nd
: 2nd
Brake
- LUB : Lubrication Pressure - REV : Reverse Clutch
Hydraulic Pressure Checking Port
REV
L/R
UD
DA
LUB
RED OD
2ND

16. 16Transaxle
Pressure Circuit (P/N) L/R BRAKE

17. 17Transaxle
* Advantage : To improve fuel consumption by reducing unnecessary high pressure
Comparison Purpose
Unnecessary high pressure Optimum pressure
10.5
4.5
TPS
Gear
1 2 3 4
8.9
6.4
Line pressure (bar)
Optimum line
pressure
Improved
efficiency
Lower fuel
consumption
Regulator valve
Pump
Line
pressure Solenoid valve
Regulator valve
Pump
Controlled
pressure Line
pressure
Line pressure (bar)
VFS (Variable Force Solenoid)

18. 18Transaxle
VSS (Vehicle Speed Sensor)
VSS is eliminated in A4CF0. Instead of this, output speed sensor (PG-B) is used for PCM.

19. 19Transaxle
FPC (Flexible Printed Circuit) Harness
10P CONN INLINE CONN VFS
PCSV CONN
OTS
10P CONN
INLINE CONN
VFS
PCSV CONN
OTS
(OTS)
(A4CFx) (A4AFx)

20. 20Transaxle
Items Solenoid Valve (0%:OFF, 100%:ON)
Range Operation
PCSV-A
(OD&LR)
PCSV-B
(2ND&RVS)
PCSV-C
(UD)
PCSV-D
(DCCSV)
ON/OFF
SOL.
P, N LR OFF ON ON OFF ON
(D,2) 1st
UD *OFFON ON OFF OFF *ONOFF
(D,2) 2nd
UD, 2ND ON OFF OFF ON OFF
(D) 3rd
UD, OD OFF ON OFF ON OFF
D-4 OD, 2ND OFF OFF ON ON OFF
R LR, RVS OFF OFF ON OFF ON
(L) 1st
UD, LR OFF ON OFF OFF ON
Operation table
* Vehicle stop  Wheel rotates

21. 21Transaxle
Input & Output
PCM
(TCM)
PCM
(TCM)
PG-A & PG-BPG-A & PG-B
GNDGND
Inhibitor SwitchInhibitor Switch
OTSOTS
Battery PowerBattery Power
Stop Lamp SwitchStop Lamp Switch
O/D OFF SwitchO/D OFF Switch
Input
OutputOutput
PCSV – A(LR&OD)PCSV – A(LR&OD)
PCSV – B(2nd
&REV)PCSV – B(2nd
&REV)
PCSV – C(UD)PCSV – C(UD)
PCSV – D(DCC)PCSV – D(DCC)
SCSV – A (On/Off)SCSV – A (On/Off)
VFSVFS
Vehicle Speed
- Cluster
- MDPS control module
- BCM
Vehicle Speed
- Cluster
- MDPS control module
- BCMCAN CommunicationCAN Communication

22. 22Transaxle
Input (PG-A) and Output Speed Sensor (PG-B)
PG-A
PG-B
VSS (From PCM to Cluster)

23. 23Transaxle
PG-A & PG-B Failure
* When PG-A or PG-B failure is detected, electrically gear is fixed to 3rd
gear.
A to B : 1.08s
Failure Detected

24. 24Transaxle
OTS (Oil Temperature Sensor)
* When OTS failure is detected, OTS current data sets to 80 .℃

25. 25Transaxle
Solenoid Valve Circuit
KEFICO (Epsilon 1.1)
UD(+)
(PCSV-C)
2nd
&Rev(+)
(PCSV-B)
LR&OD(+)
(PCSV-A)
On/Off(+)
DCC(+)
(PCSV-D)
VFS(+)
PCM

26. 26Transaxle
Solenoid valve control
P
R
N
D
* Solenoid failure checking for 80ms.

27. 27Transaxle
Solenoid Valve Fail (3rd
Gear Fixed)
* SCSV solenoid valve shorts to ground during driving under 3rd
gear resulting in
mechanical 3rd
gear fixed condition.
A to B : 1.8s

28. 28Transaxle
Resetting Auto T/A Values

29. 29Transaxle
CAN Communication
PCM
(ECM)
ABS
(ESP)
OBD Connector
Resistance
Terminal
I/P junction panel