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Home >> Volkswagen >> 2015 >> Passat TDI SE, Standard Trans >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> 2.0L - Generic Scan Tool - Engine Code: CVCA >> St Generic Scan Tool >> Diagnosis And Testing >> Diagnostic Procedures >> Radiator Shutter Motor - V544-, CHECKING >> Function
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Radiator Shutter Motor - V544-, CHECKING: Function

The Radiator Shutter Motor - V544- is used to control the mass air flow entering the lower air inlet. By closing the Radiator Shutter Motor - V544-, the head wind towards the radiator and into the engine compartment is reduced. This measure minimizes the warm-up cycle and, in addition, decreases the air resistance at the vehicle's radiator grille, thus reducing the drag coefficient (cd). At the beginning of the warm-up cycle, the Radiator Shutter Motor - V544- is closed and remains closed until the engine coolant temperature has reached a defined threshold value (80 °C). As soon as this temperature threshold has been exceeded, the Radiator Shutter Motor - V544- is opened to provide the required cooling. If the engine coolant temperature falls below the temperature threshold again during the driving cycle (e.g. due to engine stop phases during start/stop operation), the Radiator Shutter Motor - V544- is closed again. Outside of the warm-up cycle, the Engine Control Module -J623- determines the set point position of the Radiator Shutter Motor - V544- using the vehicle speed and the cooling requirement of single partial functions (e.g. engine, air conditioning, charge air).

Special tools and workshop equipment required 

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