Hyundai Tucson: Engine Control System / 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, calculated by the engine speed and the
load. The CVVT control causes a valve over-lap or under-lap between the
intake valve and the exhaust valve. This improves fuel efficiency,
reduces exhaust gases (NOx, HC) and enhances the engine performance,
thanks to reduced pumping loss, internal EGR (Exhaust Gas Recirculation)
release, improved combustion stability, and increased volumetric
efficiency.The system consists of the CVVT Oil Control Valve (OCV),
which receives the ECM PWM (Pulse With Modulation) control signal to
change the path of the engine oil to supply to or discharge from the cam
phaser, the CVVT Oil Temperature Sensor (OTS), which measures the
temperatures of the engine oil, and the cam phaser, which varies the cam
phasing by using the hydraulic force of the engine oil.The oil
delivered from the CVVT oil control valve varies the phase angle of the
cam, by rotating the rotor connected to the camshaft of the cam phaser
and causing the camshaft to rotate in the direction of its engine
running rotation (intake advanced / exhaust retarded) or the opposite
direction (intake retarded/ exhaust advanced).

- Specification
Item | Specification |
Coil Resistance (Ω) | 6.0 - 7.0 [20°C (68°F)] |
- Circuit Diagram

Harness Connector

- Inspection
1.Turn the ignition switch OFF.
2.Disconnect the VFS connector.
3.Measure resistance between the VFS terminals 1 and 2.
4.Check that the resistance is within the specification.
Specification : Refer to "Specification"
- Removal
1.Turn the ignition switch OFF and disconnect the battery negative (-) terminal.
2.Disconnect the variable force solenoid connector (A).
3.Remove the installation bolt (B), and then remove the variable force solenoid(VFS) from the engine.
Tightening Torque :9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)

- Installation
1.Install in the reverse order of removal.
• Do not reuse the O-ring (A).

• Apply the engine oil on new O-ring (A).
- Description
Purge Control Solenoid Valve (PCSV) is a solenoid valve and is
installed on the surge tank and controls the passage between the
canister and the intake manifold.The evaporative ga ...
- 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 ...
Other information:
Hyundai Tucson (NX4) 2022-2025 Service Manual: C Pillar Garnish
- Replacement
• When removing with a flat-tip screwdriver or remover, wrap protective tape around the tools to prevent damage to components.
• Put on gloves to prevent hand injuries.
1.Using a screwdriver or remover, remove the C pillar garnish (A).
2.To install, ...
Hyundai Tucson (NX4) 2022-2025 Service Manual: Description and Operation
- Description
Idle Stop & Go (ISG) system switches off the ignition when vehicle
is stopped, and then restarts the ignition and starts the vehicle when
accelerator is pushed. It temporarily stops the engine while waiting for
signal or idling to improve fuel efficiency and reduce exhaust ...