Kia Rio: Automatic Transaxle System

Kia Rio 2017-2020 YB Service Manual / Automatic Transaxle System

Specifications
Specifications

Automatic Transaxle

Item
Specification
Transaxle model
A4CF1
Engine model
Gasoline 1.4 MPI 
Torque converter type
3-element, 1-stage, 2-phase type
Torque converter size
Φ 225 mm (8.8583 in.)
Oil pump type
Parachoid
*ATF
Capacity
6.8 L (1.8 U.S gal., 7.2 U.S.qt., 5.98 Imp.qt.)
Recommended
- ATF SP-Ⅲ
·Recommended transaxle fluid : SK ATF SP-III, MICHANG ATF SP-III, NOCA ATF SP-III
Gear ratio
1st
2.919
2nd
1.551
3rd
1.000
4th
0.713
Reverse
2.480
Final gear ratio
4.375
Component elements
Oil filter
1 unit
Clutch
3 units
One-way clutch
1 unit
Brake
2 units
Planetary gear
2 units
Fluid pressure balance piston
2 units
Accumulator
4 units
Solenoid valve
6 units (*PWM : 5, *VFS : 1)

*PWM : Pulse Width Modulation

*VFS : Variable Force Solenoid

Sensors

Item
Specification
Oil temperature sensor
Type
*NTC thermistor
Temp.[(°C)°F] / Resistance (kΩ)
(-40)-40 / 139.5
(-20)-4.0 / 47.4
(0)32.0 / 18.6
(20)68.0 / 8.1
(40)104.0 / 3.8
(60)140.0 / 1.98
(80)176.0 / 1.08
(100)212.0 / 0.63
(120)248.0 / 0.38
(140)284.0 / 0.25
(160)320.0 / 0.16
Input speed sensor
Type
Hall effect sensor
Current (mA)
22 (Max)
Output voltage (V)
High : 4.8 - 5.2
Low : Below 0.8
Output speed sensor
Type
Hall effect sensor
Current (mA)
22 (Max)
Output voltage (V)
High : 4.8 - 5.2
Low : Below 0.8

*NTC: Negative Temperature Coefficient

Solenoid Valves

Item
Specification
*PCSV-A
Type
Normal open
Input voltage
12 V
Coil resistance
3.5 ± 0.2 Ω (at 25°C, 77°F)
Frequency
50 Hz
*PCSV-B
Type
Normal open
Input voltage
12 V
Coil resistance
3.5 ± 0.2 Ω (at 25°C, 77°F)
Frequency
50 Hz
*PCSV-C
Type
Normal open
Input voltage
12 V
Coil resistance
3.5 ± 0.2 Ω (at 25°C, 77°F)
Frequency
50 Hz
*PCSV-D
Type
Normal open
Input voltage
12 V
Coil resistance
3.5 ± 0.2 Ω (at 25°C, 77°F)
Frequency
50 Hz
*SCSV-A
Type
Normal open
Input voltage
12 V
Coil resistance
3.5 ± 0.2 Ω (at 25°C, 77°F)
Frequency
50 Hz
*LINE_VFS
Type
Normal open
Input voltage
12 V
Coil resistance
3.5 ± 0.2 Ω (at 25°C, 77°F)
Frequency
400 - 1000 Hz

*PCSV-A : Overdrive clutch, Low&Reverse brake control solenoid valve

*PCSV-B : 24 brake control solenoid valve

*PCSV-C : Underdrive clutch control solenoid valve

*PCSV-D : Damper clutch control solenoid valve

*SCSV-A : ON/OFF solenoid valve

*LINE_VFS : Line pressure control solenoid valve

Solenoid Valve Operation Table

Range
Solenoid Valve
*PCSV-A
*PCSV-B
*PCSV-C
*PCSV-D
*SCSV-A
N, P





1st





2nd





3rd





4th





Reverse






Clutch & Brake Operation Table

Range
Clutch
Brake
UD
OD
REV
L&R
2ND
N, P





1





2





3





4





R






Tightening Torques

Item
N·m
 Kgf·m
 lb·ft
Manual control lever mounting nut
16.7 - 20.6
1.7 - 2.1
12.3 - 15.2
Inhibitor switch mounting nut
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
10.8 - 15.9
Shift cable mounting nut
9.8 - 13.7
1.0 - 1.4
7.2 - 10.1
Shift cable retainer mounting nut
11.8 - 14.7
1.2 - 1.5
8.7 - 10.8
Shift lever mounting bolt
8.8 - 13.7
0.9 - 1.4
9.4 - 10.1
Torque converter mounting bolt
45.1 - 52.0
4.6 - 5.3
33.3 - 38.3
Transaxle support bracket mounting bolt
58.9 - 78.5
6.0 - 8.0
43.4 - 57.8
Transaxle mounting bracket bolt
88.3 - 107.9
9.0 - 11.0
65.1 - 79.6
Roll rod support bracket mounting bolt
49.0 - 68.6
5.0 - 7.0
36.2 - 50.6
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
Starter mounting bolt
49.0 - 63.7
5.0 - 6.5
36.2 - 47.0
Transaxle upper mounting bolt
42.2 - 53.9
4.3 - 5.5
31.1 - 39.8
Transaxle lower mounting bolt
42.2 - 53.9
4.3 - 5.5
31.1 - 39.8
42.2 - 48.1
4.3 - 4.9
31.1 - 35.4
ATF drain plug
39.2 - 49.0
4.0 - 5.0
28.9 - 36.2
Transaxle control module mounting nut
9.8 - 11.8
1.0 - 1.2
7.2 - 8.7
Valve body cover mounting bolt
9.8 - 11.8
1.0 - 1.2
7.2 - 8.7
Valve body assembly mounting bolt
9.8 - 11.8
1.0 - 1.2
7.2 - 8.7
Solenoid valve support bracket mounting bolt
9.8 - 11.8
1.0 - 1.2
7.2 - 8.7
Input & output speed sensor mounting bolt
9.8 - 11.8
1.0 - 1.2
7.2 - 8.7
Oil filter mounting bolt
9.8 - 11.8
1.0 - 1.2
7.2 - 8.7

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
Used with the adapter (09200-4X000) and supporter (09200-2S000)
Engine support fixture (supporter)
A : 09200-2S000
B : 09200-2S100
C : 09200-2S200

Used for holding engine assembly when removing / installing transaxle
Used with the bar (09200-3N000) and adapret (09200-4X000)
Engine support fixture (adapter)
09200-4X000

Used for holding engine assembly when removing / installing transaxle
Used with the bar (09200-3N000) and supporter (09200-2S000)
Oil seal installer
09453-2F300

Used for installing differential oil seal
Oil pressure gauge (adapter)
09452-21000

Measurement of the oil pressure (use with 09452-21500)
Used for measuring oil pressure
Used with the oil pressure gauge (09452-21500) and adapter (09452-21600)
Oil pressure gauge
09452-21500

Used for measuring oil pressure
Used with the adapter (09452-21000, 09452-21600)
Oil pressure gage (adapter)
09452-21600

Used for measuring oil pressure
Used with the oil pressure gauge (09452-21500) and adapter (09452-21000)
Inhibitor switch guide pin
09480-A3800

Used for fixing ""N"" range when installing inhibitor switch
Enging hanger
09221-A3100

Used for holding engine assembly when removing / installing transaxle
Used with the engine support fixture

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)

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 3rd, manual shifting disabled)
Faulty Solenoid valve
Inspect the solenoid valve.
Replace the valve solenoid valve.
Faulty clutch / brake
Replace the brake or clutch.
Faulty inhibitor switch
Replace the inhibitor switch.
Faulty TCM
Replace the TCM.
Limp home mode
locked into 4th, manual shifting
(2nd -> 3rd, 3rd ->2nd enabled)
Faulty input & output speed sensor
Replace the input & output speed sensor.
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.

Neutral Switch
Specifications Specifications Item Specified Type ON / OFF Operating condition Neutral gear ...

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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