Kia Stinger: Engine Control System / E-CVVT motor

Kia Stinger CK 2018-2021 Service Manual / Engine Control / Fuel System / Engine Control System / E-CVVT motor

Components and components location
Components

Appearance of E-CVVT is similar to that of hydraulic CVVT. Connector that drives DC motor and protection cover that protects the motor are mounted on the upper part. DC motor that drives the CVVT is mounted inside and covering part is sealed in order to protect oil from flowing inside.

Description and operation
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 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

Schematic diagrams
Circuit diagram

Harness Connector

Repair procedures
Removal
1.

Remove the E-CVVT.

(Refer to Engine Mechanical system - "CVVT & Camshaft")

Installation
1.

Mount the E-CVVT.

(Refer to Engine Mechanical system - "CVVT & Camshaft")

Adjustment
  

After replacing or remounting the E-CVVT assembly, be sure to reset the learned value from the additional feature menu on the KDS diagnostic device.

When the learned value for electronic cam position is erased, start learning the cam position while cranking. The engine can start once this is completed.

Cranking should be repeated for up to 2-3 times to complete learning.

Troubleshooting
Signal Waveform

There is no separate sensor inside E-CVVT. Valve timing is calculated by applying 4-flank type target wheel on the exhaust side and comparing CKPS and CMPS.

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