SsangYong Korando III (2010 year). Manual - part 44

04-11

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Load

Engine speed

Swirl 

valve

Amount of 

swirl

Remarks

Low speed,

Low load

below 3,000 rpm

Closed

Heavy

Increased EGR ratio, better air-fuel 
mixture (reduce exhaust gas)

High speed,

High load

over 3,000 rpm

Open

Light

Increase charge efficiency, higher 
engine power

The variable swirl valve actuator operates when 

turning the ignition switch ON/OFF position to 

open/close the swirl valve. In this period, the soot 

will be removed and the learning for swirl valve 

position is performed.

Swirl valve

Swirl: This is the twisted (radial) air flow along the cylinder wall during the intake stroke. This 

stabilizes the combustion even in lean air-fuel mixture condition.

3) Features

Swirl and air intake efficiency

To generate the swirl, the intake port should be serpentine design. This makes the resistance in air 

flow. The resistance in air flow in engine high speed decreases the intake efficiency. Eventually, the 

engine power is also decreased, Thus, the swirl operation is deactivated in high speed range to 

increase the intake efficiency.

Relationship between swirl and EGR

To reduce Nox, it is essential to increase EGR ratio. However, if EGR ratio is too high, the PM also 

could be very higher. And, the exhaust gas should be evenly mixed with newly aspired air. Otherwise, 

PM and CO are dramatically increased in highly concentrated exhaust gas range and EGR ratio 

could not be increased beyond a certain limit. If the swirl valve operates in this moment, the limit of 

EGR ratio will be higher.

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4) Relationship between swirl and fuel injection pressure

The injector for DI engine uses the multi hole design. For this vehicle, there are 8 holes in injector. If the 

swirl is too strong, the injection angles might be overlapped and may cause the increased PM and 

insufficient engine power. Also, if the injection pressure is too high during strong swirl, the injection angles 

might be overlapped. Therefore, the system may decreases the fuel injection pressure when the swirl is 

too strong.

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5. CIRCUIT DIAGRAM

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1. TROUBLESHOOTING

1) Work Flow

05-4

2. CAUTIONS

Do not park the vehicle on flammable materials, such as grass, leaves and carpet.

Do not touch the catalyst or the exhaust gas ignition system when the engine is running.

If a misfire occurs in the combustion chamber or the emission of pollutant exceeds the specified 

level, the catalyst can be damaged.

When servicing or replacing components of the exhaust system, makes sure that the components 

are positioned at regular intervals from all other parts of the under body.

Be careful not to damage the exhaust system when lifting the vehicle from its side.

All components and body parts of the engine exhaust system should be inspected for crack, 

damage, air hole, part loss and incorrect mounting location. Also check for any deformation which 

can result in exhaust gas drawn into the vehicle.

Make sure that the exhaust pipe is cooled down sufficiently before working on it because it is still hot 

right after the engine is stopped.

Wear protective gloves when removing the exhaust pipe.

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