Kia Optima: 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 consists of| - | the CVVT Oil Control Valve (OCV) which supplies the engine oil to the cam phaser or runs out 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, |
| - | the Cam Phaser which varies the cam phase by using the hydraulic force of the engine oil. |
Operation Principle
The CVVT has the mechanism rotating the rotor vane with hydraulic
force generated by the engine oil supplied to the advance or retard chamber
in accordance with the CVVT oil control valve contro ...
See also:
Description
According to driving environment and loading state of vehicle, head lamp lighting
direction is changed to keep the driver's visibility range and to protect the driver's
vision from glare, ...
Power Door Lock Relay Repair procedures
Inspection
Diagnosis With GDS
1.
It will be able to diagnose defects of power door lock with
GDS quickly. GDS can operates actuator forcefully, input/output value
monitoring and self diagnosi ...
Repair procedures
Removal
1.
Disconnect the negative (-) battery terminal.
2.
Remove the driver crash pad lower panel.
(Refer to the BD group - "Crash pad")
3.
Remove the steering column upper and lower sh ...