Hyundai Santa Cruz Owners & Service Manuals

Hyundai Santa Cruz: Cylinder Head Assembly / CVVT & Camshaft

- Description [Electric E-CVVT] Electric E-CVVT system is electric continuous variable valve timing system. It is located on the intake camshaft of the engine and uses motor rotation to control the rotation angle of camshaft relative to the rotation of crankshaft regardless of engine pressure. E-CVVT controls the DC motor current (duty signal) to more closely control the system compared to the previous pressure type, to increase reaction speed of cam, to improve startability, and to reduce the emission of exhaust gas. Also, operation range of intake valve (valve opening angle) is expanded. So, the output and fuel efficiency are improved. - Operation [Electric E-CVVT]

[Center OCV TYPE CVVT] The CVVT has the mechanism rotating the rotor vane with hydraulic pressure generated by the engine oil supplied to the advancing or retarding chamber through the CVVT Oil Control valve (OCV).

   

• The variable force solenoid (VFS) changes its force depending on the PWM duty to control the stroke of the OCV.

• It also controls the lock, unlock, advanced, retarded, and holding functions.

[CVVT System Mode]

(1) Low Speed / Low Load(2) Part Load

(3) Low Speed / High Load (4) High Speed / High Load


Driving ConditionExhaust ValveIntake Valve
Valve TimingEffectValve TimingEffect
(1) Low Speed
/Low Load
Completely Advance* Valve Under-lap
* Improvement of combustion stability
Neutral* Valve Under-lap
* Improvement of combustion stability
(2) Part LoadRetard* Reduction of HCRetard * Reduction of pumping loss by retarding the intake valve closing timing
(3) Low Speed
/High Load
Completely Advance* Reduction of pumping lossAdvance * Improvement of volumetric efficiency
(4) High Speed
/High Load
Completely Advance* Reduction of pumping loss Advance * Improvement of volumetric efficiency

    Cylinder Head Cover
    - Removal     • Use fender covers to avoid damaging painted surfaces. • To avoid damage, unplug the wiring connectors carefully while holding the connector portion.   ...

    Cylinder Head
    - Removal     • In case of removing the high pressure fuel pump, high pressure fuel pipe, delivery pipe, and injector, there may be injury caused by leakage of the high pressu ...

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