Kia Sportage: Automatic Transaxle Control System / Underdrive Brake Control Solenoid Valve (UD/B_VFS) Description and operation
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Underdrive brake control solenoid valve is a Variable Force Solenoid
(VFS) type.
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When TCM supplies variable current to solenoid valve, hydraulic pressure
of underdrive brake is controlled by solenoid valve.

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Underdrive brake control solenoid valve operation table
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UD/B_VFS
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N/H
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N, P
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●
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1
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2
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3
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4
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5
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●
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6
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●
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R
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●
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● : Connected status
Component Location
1. 26 Brake Control Solenoid
Valve (26/B)
2. 35R Clutch Control Solenoid Valve (35R/C)
3. Underdrive Brake Control Solenoid Valve (UD/B)
...
Other information:
Inspection
To inspect and diagnose the sensor, refer to Self-Diagnosis procedure and DTC
guide.
Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the auto defogging sensor cover (A).
...
Removal and Installation
1.
Drain the coolant.
(Refer to Cooling System - "Coolant")
2.
Remove the drive belt after turning the drive belt tensioner counterclockwise.
(Refer to Timing System - "Drive ...