Kia Optima: Engine Control System / Variable Intake Solenoid (VIS) Valve

Kia Optima DL3 2019-2021 Service and Repair Manual / Engine Control / Fuel System / Engine Control System / Variable Intake Solenoid (VIS) Valve

Specifications

Specification

Item	Specification
Coil resistance (Ω)	30.0 - 35.0 [22°C (71.6°F)]

Description and operation

Description

•	The Variable Intake Solenoid (VIS) valve controls the vacuum modulator which activates a valve in the intake manifold.

•	The ECM opens or closes this valve according to engine condition (Refer to below table).

Engine condition	VIS valve	Operation
Medium speed	Closed	Increasing engine performance in low engine speed by reducing intake interference among cylinders
Low / High speed	Open	Minimizing intake resistance by shortening intake manifold length and increasing area of air entrance

Components and components location

Components Location

1. Variable Intake Solenoid (VIS) Valve

Schematic diagrams

Circuit Diagram

Harness Connector

Repair procedures

Inspection

The engine control system can be more quickly diagnosed for troubles by using the vehicle diagnostic system (KDS). (Refer to "DTC guide")

KDS provides the following information.

(1)	Self diagnosis : Inspects and displays diagnostic trouble code (DTC)

(2)	Sensor data : Checks the system input/output value status

(3)	Forced operation : Checks the system operating status

(4)	Additional function : Controls system options, zero point adjustment and other functions

Component Inspection

1.	Turn the ignition switch OFF.

2.	Disconnect the VIS valve connector.

Measure resistance between VIS valve terminals 1 and 2.

Specification : 30.0 - 35.0 [22°C (71.6°F)]

Removal

1.	Disconnect the negative battery terminal.

2.	Disconnect the variable intake solenoid valve connector (A) and vacuum hose (B).

Remove the VIS valve after loosening the mounting bolts (A).

Tightening torque :

9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)

4.	Remove the VIS valve (A) after loosening the rod.

Installation

•	Install the component to the specified torque.

•	Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing.

•	Be careful of foreign material not to flow into the valve.

1.	Install in the reverse order of removal.

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