Contents Wiring diagrams Section: Automatic Trans All sections

Automatic Transaxle System (A4CF2): Other Hyundai Elantra IV

Automatic Trans 37 illustrations ~2225 words

LUBRICANT

ItemSpecified lubricantQuantity
Transaxle fluid liter (US qt, lmp.qt)GENUINE DIAMOND ATF SP-III or SK ATF SP-III6.6 (6.9, 5.81)

LUBRICANT SPECIFICATION

SEALANT

ItemSpecified sealant
Rear cover Torque converter housing Oil panLOCTITE FMD-546

SEALANT SPECIFICATION

FUNCTIONS

ItemContents
ComponentsThe full line pressure variable control operates in the valve body to improve the fuel consumption.
The long travel damper clutch is applied to the torque converter to improve the engine revolution change reduction capability and the fuel consumption. (17~20°)
The oil pump of the trochocentric type is changed to parachoid type to improve the processing and the capacity efficiency at the low RPM range.
The disc type return spring is applied to the low & reverse brake to improve the durability and reduce the length.
The hydraulic centrifugal oil pressure balance piston is applied to the inside of clutch to improve the durability and the shift control capability.
The low noise gear and the gear teeth face grinding are applied to the transfer driven gear to improve the noise and the durability.
Electronic control systemThe oil pressure value set by TCM is coupled with the engine torque so that the stable shift feeling can be improved.
The engine torque reduction control operates effectively to improve the shift feeling and the durability.
It can be the skip shift of 1<-->3 and 2<-->4 when shifting.
The reverse clutch, not L/R brake is controlled when controlling the N-->R shift so that the N->R shift feeling can be improved.
The range of the damper clutch direct control expands to improve the fuel consumption.
The current control chip is installed into the TCM to regulate the solenoid control current and control the oil pressure securely according to the change of the temperature and voltage.
The FPC (Flexible Printed Circuit) harness is composed of the thin and flat copper in the insulating film like electric wire.
The tachometer is operated by the change of the frequency forwarded from the TCM to the instrument cluster, not vehicle speed sensor.

FUNCTIONS REFERENCE CHART

Identifying Pharacoid Type And Trocoid Type Oil Pump. Scheme 155

Scheme 1: Identifying Sectional View Of Transaxle

OIL PUMP

The oil pump is made of the aluminum (the reaction shaft support) to loose the weight and selects the parachoid type to improve the processing and the capacity efficiency at the low RPM range.

Scheme 155: Identifying Pharacoid Type And Trocoid Type Oil Pump

BRAKES

The automatic transaxle (A4CF2) uses the low and reverse brake and the second brake. The low and reverse brake is fixed by the low and reverse annulus gear and overdrive planetary carrier at the 1st speed.

Scheme 156

Scheme 156: BRAKES
  1. The disc type return spring is applied to the low and reverse brake and it minimizes the slip of the friction material from the uniform spring operation power to improve the durability and reduce the length. The overdrive sun gear is held on the transaxle case by the second brake at the 2nd speed. see scheme 4: Identifying Disc Type Return Spring On Low And Reverse Brake

CLUTCH

The multiple clutches and the one way clutch are used as the transaxle device.

The retainer of each clutch is composed of the precision sheet metal parts to realize the productivity and the light weight.

The hydraulic centrifugal oil pressure balance device places inside the clutch assembly.

Generally the oil remained in the piston oil pressure chamber pushes the piston by the centrifugal force. But to prevent the piston from being pushed, the oil filled in between the piston and the return spring retainer occurs the centrifugal force and both of the power is offset so that the piston don't move. In result, it improves the durability and the shift control ability.

Identifying Clutch Assembly Components. Scheme 157

Scheme 157: Identifying Clutch Assembly Components

1. UNDERDRIVE CLUTCH

The underdrive clutch is engaged at 1st, 2nd and 3rd speed.

The driving force of input shaft is delivered to the underdrive sun gear.

The operating oil pressure in the underdrive clutch components operates between the piston and the retainer

and pushes the piston to the clutch discs to deliver the driving force from the retainer to the hub.

Identifying Parking System Components. Scheme 158

Scheme 6: Identifying Underdrive Clutch Components

2. REVERSE CLUTCH AND OVERDRIVE CLUTCH

The reverse clutch is engaged at the reverse and delivers the driving force of input shaft to the reverse sun gear. The overdrive clutch is engaged at the 3rd and 4th speed and delivers the driving force of input shaft to the overdrive planetary carrier and the low and reverse annulus gear.

The operating oil pressure of the reverse clutch operates between the reverse clutch retainer and overdrive clutch retainer and it has the whole overdrive clutch moved to deliver into the hub via retainer.

Identifying Reverse And Overdrive Clutch Components. Scheme 159

Scheme 159: Identifying Reverse And Overdrive Clutch Components

PARKING SYSTEM

The parking system for A4CF2 model is the cam type. The roller type installed to the existing new generation AT needs the support to move the roller when operating the parking system and is so complicated. But the cam type for A4CF2 model doesn't need the support and the structure is simply. It only needs the guide to prevent from moving the cam idly.

Scheme 158: Identifying Parking System Components

POWER TRAIN

UD/COD/CREV/C2-4/BLR/BOWC
P
R
N
D1
D2
D3
D4
L

OPERATING ELEMENT OF EACH SHIFTING RANGE

MAIN FEATURES

The VFS (Variable Force Solenoid) installed in the valve body is applied to transaxle (A4CF2). VFS varies the line pressure from 4.5bar to 10.5bar according to throttle open angle and shift range to improve the fuel consumption and shift ability.

And the reducing valve which is installed in the valve body makes the solenoid control pressure using the reducing pressure instead of the line pressure like the HIVEC transaxle.

The material of spool valve in the valve body is changed from the steel to aluminum to reduce the oil leakage by the thermal expansion between the valve body and spool valve at the high temperature.

The switch valve, the solenoid valve and the fail safe valve are operated to drive the vehicle at the 3rd speed and reverse even thought the malfunction of the electronic control parts occur.

Line Pressure Graph. Scheme 160

Scheme 160: Line Pressure Graph

Hydraulic Circuit Diagram. Scheme 161

Scheme 161: Hydraulic Circuit Diagram

Electronic Control System Diagram. Scheme 162

Scheme 162: Electronic Control System Diagram

SENSOR AND ACTUATOR FUNCTION

ITEMFUNCTION
Input shaft speed sensorDetect the input shaft rpm (TURBINE RPM) at the OD/RVS retainer
Output shaft speed sensorDetect the output shaft rpm (T/F DRIVE GEAR RPM) at the T/F drive gear
Engine rpm signalReceive the engine rpm via CAN communication with ECM
Fluid temperature sensorDetect the temperature of ATF through the thermistor
Brake switchDetect the brake operation at the contact switch of the brake pedal
Inhibitor switchDetect the position of select lever through the contact switch
ON/OFF solenoid valveControl the hydraulic passage for the shift control
VFS solenoid valveChange the line pressure from 4.5 bar to 10.5 bar according to throttle open angle and shift ranges
PCSV-AControl the OD or L/R hydraulic pressure to the pressure control valve for shift control
PCSV-BControl the 2/4 or REV hydraulic pressure to the pressure control valve for shift control
PCSV-CControl the UD hydraulic pressure to the pressure control valve for shift control
PCSV-DControl the hydraulic pressure for the damper clutch control
Torque reduction operation signalReceive the signal of engine reduction pressure operation from ECM via CAN communication
ClusterSend the signal of the current position of shift lever and vehicle speed and operate the lamp, distance meter and speed meter

SENSOR AND ACTUATOR FUNCTION REFERENCE

TCM

The TCM which is adapted to the new small sized automatic transaxle (A4CF2) is integrated into the ECM and deliver information via CAN communication.

ITEMSIEMENS TCM
HardwareIntegrated type
Duty drivingChopping method
Main oil pressure control componentsTurbin torque, Vehicle speed
ATF Temp, compensation controlIndependently
Direct control rangeWide

ITEMS AND SIEMENS TCM REFERENCE

TLE6288 current control chip

The TLE6288 current control chip is installed into the TCM to regulate the solenoid control current and control the oil pressure securely according to the change of the temperature and voltage. In this case, the control signal of solenoid valve is divided into the Peak signal and the Hold signal.

  1. Peak : The 12 voltage signal applied to move the solenoid plunger quickly.
  2. Hold : The signal applied to keep holding the pulled solenoid valve.

ECM- TCM CAN COMMUNICATION ERROR MANAGEMENT

No.ItemError management
1Engine rpm3,000 RPM
2Engine torque80%
3Vehicle speed0 km/h
4A/C SwitchOFF
5Engine coolant temperature70°C
6TPS50%
7Shift range hold signalOFF

ECM- TCM CAN COMMUNICATION ERROR MANAGEMENT

Hydraulic Circuit Diagram (N Range, P Range). Scheme 163

Scheme 163: Hydraulic Circuit Diagram (N Range, P Range)

Hydraulic Circuit Diagram (D Range (1ST)). Scheme 164

Scheme 164: Hydraulic Circuit Diagram (D Range (1ST))

Hydraulic Circuit Diagram (D Range (2ND)). Scheme 165

Scheme 165: Hydraulic Circuit Diagram (D Range (2ND))

Hydraulic Circuit Diagram (D Range (3RD)). Scheme 166

Scheme 166: Hydraulic Circuit Diagram (D Range (3RD))

Hydraulic Circuit Diagram (D Range (4TH)). Scheme 167

Scheme 167: Hydraulic Circuit Diagram (D Range (4TH))

Hydraulic Circuit Diagram (R Range). Scheme 168

Scheme 168: Hydraulic Circuit Diagram (R Range)

Hydraulic Circuit Diagram (L Range). Scheme 169

Scheme 169: Hydraulic Circuit Diagram (L Range)

ELEMENTS IN USE IN EACH GEAR

UD/COD/CREV/C2-4/BLR/BOWC
P
R
N
D1
D2
D3
D4
L

OPERATING ELEMENT OF EACH SHIFTING RANGE

STANDARD HYDRAULIC PRESSURE TABLE

No.Shift range positionOperationMeasuringOil pressure (kgf/cm 2 )
PCSV-APCSV-BPCSV-CPCSV-DON/OFFLR2/4 (2ND)UDODREV
1D010000ONLR10.5±0.2010.5±0.200
2505.3±0.4
3751.0±0.3
41000
50100OFF2/4 (2ND)010.5±0.2
6505.3±0.4
7750.9±0.3
81000
90OD10.5±0.2
10505.6±0.4
11751.0±0.3
121000
1300UD10.5±0.2
14505.6±0.4
15751.0±0.3
1601000
17R0ONREV17.7±0.817.7±0.8
1850&uarr8.7±0.8
19750.9±0.5
201000
[Measure condition] • Oil pump revolution : 2500rpm • LPCSV Duty ratio : 0% NOTE: The oil pressure values of "0" marked on the above table must measure less than 0.1 kgf/cm 2 when testing. * The values are subject to change according to vehicle model or condition.
NOTE
The oil pressure values of "0" marked on the above table must measure less than 0.1 kgf/cm 2 when testing.

STANDARD HYDRAULIC PRESSURE TABLE

MONITOR SCANTOOL DATA

  1. Connect scantool to data link connector (DLC).
  2. Ignition "ON".
  3. Confirm the "ROM I.D".
  4. Perform the "ROM UP-DATE".
  5. Perform the Re-diagnosis.
  6. Is "DTC" disappeared? YES Fault is intermittent caused by poor contact in the sensor's and/or PCM/TCM's connector or was repaired and PCM/TCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage. Repair or replace as necessary and go to " «VERIFICATION OF VEHICLE REPAIR»(ref-287431-S15316439262008061200000) " procedure. NO Replace PCM/TCM as necessary and then go to " «VERIFICATION OF VEHICLE REPAIR»(ref-287431-S15316439262008061200000) " procedure.

VERIFICATION OF VEHICLE REPAIR

After a repair, it is essential to verify that the fault has been corrected.

  1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode
  2. Using a scantool, clear DTC
  3. Operate the vehicle within DTC Enable conditions in general information.
  4. Are any DTCs present ? YES Go to the applicable troubleshooting procedure. NO System performing to specification at this time.

Identifying Transaxle Range Switch. Scheme 170

Scheme 170: Identifying Transaxle Range Switch

After a repair, it is essential to verify that the fault has been corrected.

  1. Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode.
  2. Using a scantool, Clear DTC.
  3. Operate the vehicle within DTC Enable conditions in General information.
  4. Are any DTCs present? YES Go to the applicable troubleshooting procedure. NO System performing to specification at this time.

SIGNAL WAVEFORM

Refer to DTC P0707 .

Refer to DTC P0707 .

Refer to DTC P0707 .

Scheme 171

Scheme 32: Identifying Automatic Transaxle Fluid Temperature Sensor

After a repair, it is essential to verify that the fault has been corrected.

  1. Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode.
  2. Using a scantool, Clear DTC.
  3. Operate the vehicle within DTC Enable conditions in General information.
  4. Are any DTCs present? YES Go to the applicable troubleshooting procedure. NO System performing to specification at this time.

Refer to DTC P0711 .

Refer to DTC P0711 .

Refer to DTC P0711 .

Refer to DTC P0711 .

Scheme 172

Scheme 39: Identifying Input Speed Sensor

After a repair, it is essential to verify that the fault has been corrected.

  1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
  2. Using a scan tool, Clear DTC.
  3. Operate the vehicle within DTC Enable conditions in General information.
  4. Are any DTCs present? YES Go to the applicable troubleshooting procedure. NO System performing to specification at this time.

Refer to DTC P0716 .

Refer to DTC P0716 .

Refer to DTC P0716 .

Scheme 173

Scheme 48: Identifying Output Speed Sensor

Refer to DTC P0716 .

Scheme 174

Scheme 56: Identifying UD Clutch And L/R Brake

After a repair, it is essential to verify that the fault has been corrected.

  1. Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode.
  2. Using a scantool, Clear DTC.
  3. Operate the vehicle within DTC Enable conditions in General information.
  4. Are any DTCs present ? YES Go to the applicable troubleshooting procedure. NO System performing to specification at this time.

Scheme 175

Scheme 61: Identifying UD Clutch And 2nd Clutch

Refer to DTC P0731 .

Scheme 176

Scheme 66: Identifying UD Clutch And OD Clutch

Refer to DTC P0731 .

Scheme 177

Scheme 71: Identifying UD Clutch And 2nd Brake

Refer to DTC P0731 .

Scheme 178

Scheme 75: Identifying Torque Converter Clutch

After a repair, it is essential to verify that the fault has been corrected.

  1. Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode.
  2. Using a scantool, Clear DTC.
  3. Operate the vehicle within DTC Enable conditions in General information.
  4. Are any DTCs present ? YES Go to the applicable troubleshooting procedure. NO System performing to specification at this time.
  1. Connect scantool to data link connector (DLC).
  2. Engine "ON".
  3. Select "D RANGE" and drive vehicle.
  4. Monitor the "TORQUE CONVERTER (DAMPER) CLUTCH" parameter on the scantool. Specification: TCC SLIP > 5RPM see scheme 79: Scantool Display - TORQUE CONVERTER (DAMPER) CLUTCH Parameter
  5. Is TCC SLIP within specifications? YES Fault is intermittent caused by poor contact in the sensor's and/or TCM (PCM)'s connector or was repaired and TCM (PCM) memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage. Repair or replace as necessary and go to " «VERIFICATION OF VEHICLE REPAIR»(ref-287431-S08638528312008061200000) " procedure. NO Go to " «COMPONENT INSPECTION»(ref-287431-S33758345812008061200000) " procedure.

Scheme 179

Scheme 179
  1. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE Connect scantool to data link connector (DLC). Ignition "ON" & Engine "OFF". Select A/T solenoid valve actuator test and operate actuator test. Is Actuator Testing performed normally? see scheme 80: Scantool Display - ACTUATION TEST YES Go to 2 "Check OIL PRESSURE" as below. NO Repair or replace as necessary and then go to " «VERIFICATION OF VEHICLE REPAIR»(ref-287431-S08638528312008061200000) " procedure.
  2. CHECK OIL PRESSURE see scheme 81: Identifying DR Port Connect oil pressure gauge to "DR" port. Ignition "ON" & Engine "OFF". After connecting scantool and monitor the "TCC SOLENOID VALVE DUTY" parameter on the scantool data list. Select 1st gear and accelerate Engine speed to 2500 rpm. Measure oil pressure. Specification: approx. Above 5.1~7.1 kg/cm 2 (500~696kpa, 72.5~100.99psi) Is oil pressure value within specification? YES Repair TORQUE CONVERTER CLUTCH (REPLACE Torque Converter) as necessary and go to " «VERIFICATION OF VEHICLE REPAIR»(ref-287431-S08638528312008061200000) " procedure. NO Replace A/T assembly (possible to BODY CONTROL VALVE faulty) as necessary and Go to " «VERIFICATION OF VEHICLE REPAIR»(ref-287431-S08638528312008061200000) " procedure.

Refer to DTC P0741 .

Scheme 180

Scheme 82: Identifying PCSV-A, PCSV-B, PCSV-C And PCSV-D

Refer to DTC P0741 .

Scantool Display - VF SOL. VALVE Parameter. Scheme 181

Scheme 91: Identifying VFS Solenoid Valve
  1. Connect scantool to data link connector (DLC).
  2. Engine "ON".
  3. Monitor the "VF SOL. VALVE" parameter on the scantool.
  4. Shift gear at each position.
Scheme 181: Scantool Display - VF SOL. VALVE Parameter

YES

  1. Fault is intermittent caused by poor contact in the sensor's and/or TCM (PCM)'s connector or was repaired and TCM (PCM) memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage. Repair or replace as necessary and go to " «VERIFICATION OF VEHICLE REPAIR»(ref-287431-S24861615842008061200000) " procedure.

NO

  1. Go to " «TERMINAL & CONNECTOR INSPECTION»(ref-287431-S09427068122008061200000) " procedure.

Refer to DTC P0741 .

Refer to DTC P0743 .

Refer to DTC P0741 .

Refer to DTC P0743 .

Refer to DTC P0743 .

After a repair, it is essential to verify that the fault has been corrected.

  1. Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode.
  2. Using a scantool, Clear DTC.
  3. Operate the vehicle within DTC Enable conditions in General information.
  4. Are any DTCs present? YES Go to the applicable troubleshooting procedure. NO System performing to specification at this time.

After a repair, it is essential to verify that the fault has been corrected.

  1. Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode.
  2. Using a scantool, Clear DTC.
  3. Operate the vehicle within DTC Enable conditions in General information.
  4. Are any DTCs present? YES Go to the applicable troubleshooting procedure. NO System performing to specification at this time.

Refer to DTC U0001 .

Refer to DTC U0001 .

Refer to DTC U0001 .

Scheme 182

Scheme 143: Identifying Automatic Transaxle Components (1 Of 2)

Scheme 183

Scheme 144: Identifying Automatic Transaxle Components (2 Of 2)

PWM (PULSE WIDTH MODULATION) SOLENOID

RangePWM solenoid valve
PCSV-APCSV-BPCSV-CPCSV-DON, OFF
N, POFFONONOFFON
1stONONOFFOFFON
2ndONOFFOFFONOFF
3rdOFFONOFFONOFF
4thOFFOFFONONOFF
ReverseOFFOFFONOFFON
LOWOFFONOFFOFFON

PULSE WIDTH MODULATION SOLENOID VALVE POSITION REFERENCE

PWM Solenoid Valve Pressure Graph. Scheme 184

Scheme 184: PWM Solenoid Valve Pressure Graph

PWM solenoid valve is controlled linearly according to the duty ratio.

Oil pressure range: 0~4.3 kgf/cm 2 (0~422kpa, 0~61.2psi)

Type3way & Normal High
Supply voltage12V
Coil resistance3.2±0.2ohms (at 25°C, 77°F)
Cycle50Hz

VOLTAGE AND RESISTANCE SPECIFICATION

Identifying PWM Solenoid Valve. Scheme 185

Scheme 185: Identifying PWM Solenoid Valve

Scheme 186

Scheme 186: REMOVAL
  1. Remove the battery terminal.
  2. Lift the vehicle.
  3. Remove the under cover.
  4. Loosen the drain plug and drain the transaxle oil.
  5. Remove the oil pan.
  6. Remove the oil filter.
  7. Remove the valve body (refer to Valve Body Disassembly in overhaul)
  8. Disconnect the main harness (A) from valve body. see scheme 205: Disconnecting Main Harness From Valve Body
  9. Remove the solenoid valve assembly (A).

Identifying Solenoid Valve Assembly. Scheme 187

Scheme 187: Identifying Solenoid Valve Assembly

Scheme 188

Scheme 188: INSTALLATION
  1. Install the solenoid valve. CAUTION: Apply the ATF oil or White Vaseline to the O-ring not to be damaged.
  2. Connect the solenoid valve connector to the valve body. CAUTION: When connecting the solenoid valve connector, check the connector for rust, dirt, or oil, then reconnect it.
  3. Install the valve body (refer to Valve Body Reassembly in overhaul) TORQUE: 10~12Nm (1.0~1.2kgf.m, 7~8lb-ft)
  4. Install the oil filter. TORQUE: 10~12Nm (1.0~1.2kgf.m, 7~8lb-ft)
  5. Continue to apply liquid gasket at application points at the oil pan with 02.5mm (0.098in) thickness. Liquid gasket Part name: Threebond 1281B (Scheme 186): Identifying Liquid Gasket On Oil Pan
  6. Tighten the mounting bolt with the specified torque after installing the oil pan. TORQUE: 10~12Nm (1.0~1.2kgf.m, 7~8lb-ft)
  7. Install the drain plug. TORQUE: 35~45Nm (3.5~4.5kgf.m, 25~32lb-ft)
  8. Installation is the reverse of the removal.