Hyundai Palisade: Hydraulic System / 28 Brake Control Solenoid Valve (28/B_VFS)

Hyundai Palisade (LX2) 2020-2024 Service Manual / Automatic Transaxle System (A8LF1) / Hydraulic System / 28 Brake Control Solenoid Valve (28/B_VFS)

Description and operation
Description
•
When TCM supplies variable current to solenoid valve, hydraulic pressure of 28 brake is controlled directly by solenoid valve.
•
28 Brake control solenoid valve is a Variable Force Solenoid (VFS) type.

Hyundai Palisade. Description and operation
Components and components location
Components Location

Hyundai Palisade. Components and components location

1. 28 Brake control solenoid valve (28/B_VFS)
2. 46 Clutch control solenoid valve (46/C_VFS)
3. 37R Clutch control solenoid valve (37R/C_VFS)
4. UD Clutch control solenoid valve (UD/C_VFS)
 5. OD Clutch & LR Brake control solenoid valve (OD/C & LR/B_VFS)
6. SS-A solenoid valve (SS-A_ON/OFF)
7. Torque converter control solenoid valve (T/CON_VFS)
8. Line pressure control solenoid valve (LINE_VFS)

Specifications
Specification
Clutch & Brake Control VFS
▷ Control type : Normally Low
Item
Specification
Control pressure (kpa (kgf/cm, psi))
 0 - 1,569.06
(0 - 16, 0 - 227.57)
Current (mA)
 0 - 1,100
Internal resistance (Ω)
 5.3 ± 0.3

▷ Operation of the solenoid valve
Division
Solenoid Valve
Clutch
28/B_VFS
28/B
P

R

N

1

2
 ●
 ●
3

4

5

6

7

8
 ●
 ●
Remark
 ● : Connected
 ●: Operation
◎ : Variable connected

Repair procedures
Inspection
Hyundai Palisade. Repair procedures   
•
Refer to the DTC manual for the check procedure.
Removal
Hyundai Palisade. Repair procedures   
•
Be careful not to damage the parts located under the vehicle (floor under cover, fuel filter, fuel tank and canister) when raising the vehicle using the lift.
(Refer to General Information - "Lift and Support Points")
•
When the solenoid valve Diagnostic Trouble Codes (DTC) is on, perform the following procedure to replace it.
•
Automatic transaxle is composed of delicate components. Be careful not to cause any damage on the component in the course of assembly and disassembly.
•
Maintain clean condition so that foreign substance does not get into the automatic transaxle.
•
Use a coated apron, latex gloves, and stainless tray to prevent foreign substance from getting into the transaxle.
•
Automatic transaxle fluid (ATF) can be reused. Collect it using a clean 10-liter beaker.
1.
Turn ignition switch OFF and disconnect the negative (-) battery cable.
2.
Remove the battery and battery tray.
(Refer to Engine Electrical System - "Battery")
3.
Remove the air duct and air cleaner assembly.
(Refer to Engine Mechanical System - "Air Cleaner")
4.
Remove the under cover.
(Refer to Engine Mechanical System - "Engine Room Under Cover")
5.
Drain the coolant.(If equipped ATF warmer)
(Refer to Cooling System - "Coolant")
6.
Loosen the drain plug (A) and reinstall the drain plug after draining ATF totally.
Tightening torque :
33.3 - 43.1 N.m (3.4 - 4.4 kgf.m, 24.6 - 31.8 lb-ft)

Hyundai Palisade. Repair procedures

Hyundai Palisade. Repair procedures   
•
Replace the gasket before reinstalling the drain plug.
7.
Loosen the bolts (A) and then removing the wiring bracket.
Tightening torque :
9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)

Hyundai Palisade. Repair procedures
8.
Loosen the bolts (A) and then removing the battery wiring bracket.
Tightening torque :
9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)

Hyundai Palisade. Repair procedures
9.
Remove the ATF cooling hose (A).

Hyundai Palisade. Repair procedures

Hyundai Palisade. Repair procedures   
•
Carefully install the clamp not to damage the hose.
•
Install the clamp in a correct direction not to be interfered with other parts.
•
After the installation, start the engine and then check if there are any leakages from the hose.
10.
Loosen the upper bolts (A) of the valve body cover.
Tightening torque :
11.8 - 13.7 N.m (1.2 - 1.4 kgf.m, 8.7 - 10.1 lb-ft)

Hyundai Palisade. Repair procedures
11.
Loosen the bolts and then removing the valve body cover (A).
Tightening torque :
11.8 - 13.7 N.m (1.2 - 1.4 kgf.m, 8.7 - 10.1 lb-ft)
Hyundai Palisade. Repair procedures   
•
Be careful when removing the valve body cover because the remaining ATF remains in the valve body cover.

Hyundai Palisade. Repair procedures

Hyundai Palisade. Repair procedures   
•
Replace the gasket (A) before reinstalling the valve body cover.
•
After the installation, start the engine and then check if there are any leakages from the valve body cover.

Hyundai Palisade. Repair procedures
12.
Loosen the bolts and then removing the main harness (A).
Tightening torque :
9.8 - 11.8 N.m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb-ft)

Hyundai Palisade. Repair procedures
13.
Remove the support bracket (A).
Tightening torque :
9.8 - 11.8 N.m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb-ft)

Hyundai Palisade. Repair procedures
14.
Loosen the bolt (A).
Tightening torque :
9.8 - 11.8 N.m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb-ft)

Hyundai Palisade. Repair procedures
15.
Remove the roller (A) using the magnet.

Hyundai Palisade. Repair procedures
16.
Remove the 28 Brake control solenoid valve (A).

Hyundai Palisade. Repair procedures
Installation
Hyundai Palisade. Repair procedures   
•
Note the value (A) carefully and check the value again before assembly.
•
Inputting an invalid value may cause the abnormal shifting shock while TCM learning.

Hyundai Palisade. Repair procedures
1.
To install, reverse the removal procedure.
2.
Inject the automatic transaxle oil and inspect the oil level.
(Refer to Automatic Transaxle System - "Automatic Transaxle Fluid")
3.
Clear the diagnostic trouble codes (DTC) using the diagnostic tool.
Hyundai Palisade. Repair procedures   
•
Even though disconnecting the battery negative terminal, the DTCs will not be cleared. So, be sure to clear the DTCs using the diagnostic tool.
4.
Reset the automatic transaxle adaptive values using the diagnostic tool.

Hyundai Palisade. Repair procedures
5.
Input the oil pressure characteristics using the diagnostic tool.

Hyundai Palisade. Repair procedures

Hyundai Palisade. Repair procedures
6.
In order to prevent start delay and gear shift shock during acceleration and start, perform TCM learning after replacing the solenoid valve.
(Refer to Automatic Transaxle Control System - "Repair Procedures")

    37R Clutch Control Solenoid Valve (37R/C_VFS)

    Description and operation Description • When TCM supplies variable current to solenoid valve, hydraulic pressure of 37R clutch is controlled directly by solenoid valve...

    UD Clutch Control Solenoid Valve (UD/C_VFS)

    Description and operation Description • When TCM supplies variable current to solenoid valve, hydraulic pressure of UD clutch is controlled directly by solenoid valve...

    Other information:

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