Kia Optima Hybrid: Automatic Transaxle Control System / Underdrive Brake Control Solenoid Valve (UD/B_VFS) Repair procedures

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual / Automatic Transaxle System / Automatic Transaxle Control System / Underdrive Brake Control Solenoid Valve (UD/B_VFS) Repair procedures

Inspection

1.	Turn ignition switch OFF.

Remove the air duct (A).

Tightening torque:

7.8 ~ 9.8 N.m (0.8 ~ 1.0 kgf.m, 5.8 ~ 7.2 lb-ft)

Remove the air cleaner assembly.

(1)	Disconnect the breather hose (A).

(2)	Disconnect the air intake hose (B) and then remove the air cleaner assembly (C).

Tightening torque:

Hose clamp bolt:

2.9 ~ 4.9 N.m (0.3 ~ 0.5 kgf.m, 2.2 ~ 3.6 lb-ft)

Air cleaner assembly bolts:

7.8 ~ 9.8 N.m (0.8 ~ 1.0 kgf.m, 5.8 ~ 7.2 lb-ft)

•	When installing the air intake hose, the plate of the hose clamp must be in line with the stopper of the hose.

•	When installing the air intake hose, the center of the mark of hose must be in line with the throttle body rib.

4.	Remove the solenoid valve connector (A).

5.	Measure resistance between signal terminal and ground terminal.

6.	Check that the resistance is within the specification.

Removal

Replacing an on/off solenoid valve (SS-A, SS-B) does not require additional hydraulic pressure adjustment; however, the hydraulic pressure will need to be adjusted after replacing the VFS solenoid valve. If replacing the VFS solenoid valve; also replace the valve body assembly.

(Refer to Hydraulic System - "Valve Body")

Underdrive Brake Control Solenoid Valve (UD/B_VFS) Schematic Diagrams

Circuit Diagram ...

Overdrive Clutch Control Solenoid Valve (OD/C_VFS) Description and Operation

Description Overdrive clutch control solenoid valve(OD/C_VFS) is attached to the valve body. This variable force solenoid valve directly controls the hydraulic pressure to the overdrive clutch. ...

Other information:

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Special Service Tools

Special Service Tools Tool Name / NumberIllustrationDescriptionRKE Battery Checker09954-2P100Measuring the RKE batteryvoltage Personal Protective Equipment NameIllustrationDescriptionInsulation gloveUsed when inspecting or working on the high voltage components[Insulation performance : 1000V / 300A or ...

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Trailing Arm Repair procedures

Replacement 1. Remove the rear wheel & tire. Tightening torque: 88.3 ~ 107.9N.m (9.0 ~ 11.0kgf.m, 65.1 ~ 79.6lb-ft) Be careful not to damage the hub bolts when removing the rear wheel & tire. 2. Loosen the bolt & nut and then remove the rear upper arm (A) from the rear axle. ...