2.4 Vis (Variable Intake System)

This VIS consist of 2 control vlaves and make optimum condition according to the engine rpm, throttle andgle, and VSS(Vehicle Speed Sensor) - (3 stage – Low, Middle, High)

Engine RPM -Low		- LH(Left Head) BANK and RH(Right Head) BANK are divided. - Volume efficiency is improved by preventing from interfering in cylinders at low speed
Engine RPM –Middle		- In order to connecting LH/RH BANK, open the interference valve - Volume efficiency is improved by using pressure pulsation of cylinder
Engine RPM -High		- In order to reducing length of manifold, open the manifold valve - As minimizing the intake air resistance and coming from stored air and throttle body, power can be increased

Vacuum line

One way valve

From I/valve

From M/valve

To intake manifold

Manifold Valve

3.D Engine (2.0l)

3.1 Injector

There are Graded type of injector using for TUCSON CRDI engine system, The purpose which injectors are divided with three different types is mainly forced on reducing emission deviation by variation in injected fuel quantity by injector.

This injector has been used from March 2003 year production. The best way to check injector type is investigating the head of injector as shown following picture.

Fig. Graded Injector

It has 3 different types identification letter X, Y and Z.

When you make any replacing job, simply choose the same injector grade type like previous one. For example if the previous one installed in No. 2 cylinder is X grade type then choose X grade injector first and then install it to No. 2 cylinder.

□ Combination Chart for Graded Injector

Combination	Graded Injector Unit			Remarks
	X	Y	Z
Case 1	0	4	0	Cylinder No. is not regulated when installs Y graded injector should be more than 2 cylinder.
Case 2	1	3	0
Case 3	0	3	1
Case 4	2	2	0
Case 5	0	2	2

Above combination chart should be kept when you re-install or replace any injectors. Of course all injectors from the factory side using graded injector system follows the combination installation system as shown above chart.

It doesn’t matter of cylinder No. but you should keep the chart. In case when you replace all 4 general type injector with graded injector, also you should meet the mentioned chart combination.

For example, if you have 5 injectors which shows X grade –1, Y grade – 2 and Z grade-2, possible installation cases are,

Case 1 : Y grade – 2, X grade –2 (Case No. 4 in the Chart)

Case 2 : Y grade – 2, Z-Grade – 2 ( Case No. 5 in the Chart)