Hyundai i-30: Engine Control System / Variable Force Solenoid (VFS)

Hyundai i30 (PD) 2018-2024 Service Manual / Engine Control / Fuel System / Engine Control System / Variable Force Solenoid (VFS)

Description and operation
Description
Continuous Variable Valve Timing (CVVT) system advances or retards the valve timing of the intake and exhaust valve in accordance with the ECM control signal which is calculated by the engine speed and load.
By controlling CVVT, the valve over-lap or under-lap occurs, which makes better fuel economy and reduces exhaust gases (NOx, HC) and improves engine performance through reduction of pumping loss, internal EGR effect, improvement of combustion stability, improvement of volumetric efficiency, and increase of expansion work.
This system consist of the CVVT Oil Control Valve (OCV) which supplies the engine oil to the cam phaser or cuts the engine oil from the cam phaser in accordance with the ECM PWM (Pulse With Modulation) control signal, the CVVT Oil Temperature Sensor (OTS) which measures the engine oil temperature, and the Cam Phaser which varies the cam phase by using the hydraulic force of the engine oil.
The engine oil getting out of the CVVT oil control valve varies the cam phase in the direction (Intake Advance/Exhaust Retard) or opposite direction (Intake Retard/Exhaust Advance) of the engine rotation by rotating the rotor connected with the camshaft inside the cam phaser.

Specifications
Specification
[Bank 1 / Intake, Exhaust]
Item
Specification
Coil Resistance (Ω)
5.12 - 6.12 [20°C (68°F)]
Output Voltage (V)
10 - 16

Schematic diagrams
Circuit Diagram

Harness Connector

Repair procedures
Removal
Variable force solenoid (VFS) [Bank 1 / Intake]
1.
Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2.
Disconnect the variable force solenoid connector (A).

3.
Remove the engine mounting support bracket.
(Refer to Engine Mechanical System - "Engine Mounting")
4.
Remove the variable force solenoid from the engine after loosening mounting bolt (A).
Tightening Torque :
9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb.ft)

Variable force solenoid (VFS) [Bank 1 / Exhaust]
1.
Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2.
Disconnect the variable force solenoid connector (A).
3.
Remove the variable force solenoid from the engine after loosening mounting bolt (B).
Tightening Torque :
9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb.ft)

Installation
  
Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.
Note that install the variable force solenoid (VFS) as below.
1)
After replacing the variable force solenoi valve (VFS) O-ring (A), apply the engine oil on the new O-ring.

2)
Tighten the variable force solenoid valve (VFS) all the way to the timing chain cover mounting surface, and then temporary tighten the bolts.
3)
Install the variable force solenoid with the specified torques.
1.
Install in the reverse order of removal.

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