Hyundai Tucson (NX4) 2022-2025 Service Manual / Engine Control / Fuel System / Engine Control System / Variable Intake Solenoid (VIS) Valve

Hyundai Tucson: Engine Control System / Variable Intake Solenoid (VIS) Valve

- Description Variable Intake manifold Solenoid (VIS) valve is installed on the intake manifold. The 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

- Specification

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

- Circuit Diagram

Harness Connector

- Inspection

1.Turn the ignition switch OFF.

2.Disconnect the VIS valve connector.

3.Measure resistance between VIS valve terminals 1 and 2.

Specification : Refer to "Specification"

- Removal

1.Turn the ignition switch OFF and disconnect the battery negative (-) cable.

2.Disconnect the VIS valve connector (A).

3.Disconnect the hose (A) and then remove the VIS valve (B).

Tightening Torque :9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)

- Installation

• Install the component with the specified torques.

• Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.

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

1.Install in the reverse order of removal.

Variable Force Solenoid (VFS)

- Description CVVT (Continuous Variable Valve Timing) system advances or retards the valve opening and closing timing of the intake or the exhaust valve in accordance with the ECM control, calc ...

E-CVVT Motor

- Description E- CVVT (Electric Continuous Variable Valve Timing) system, located on the intake camshaft of the engine, uses motor rotation to control the rotation angle of camshaft relative to ...

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