Radiator Shutter Motor - V544-, Checking

General Description

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

Multimeter.
Wiring Diagram.
Scan Tool.

Test requirements

Fuses OK.
Battery voltage OK.
Switch OFF all electrical and electronic accessories.
Vehicles with automatic transmission, ensure the selector lever position is in "P".
Vehicles with manual transmission, ensure the shifter lever position is in "N" with the parking brake applied.
Observe all safety precautions: SAFETY PRECAUTIONS .
View clean working conditions: CLEAN WORKING CONDITIONS .

Test Procedure

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers complaint. Refer to PRELIMINARY CHECK . -- Was Complaint verified?	-- YES: GO TO: Step 2 Radiator Shutter Motor - V544-, CHECKING - 2 . -- NO: GATHER more information from customer about the complaint.
2	IGNITION: OFF. DISCONNECT: Radiator Shutter Motor - V544- harness connector. IGNITION: ON. CHECK: Radiator Shutter Motor - V544- harness connector T4bv / 4 to T4bv / 1 for voltage. IGNITION: OFF. SPECIFIED VALUE: Battery voltage. -- Was Value obtained?	-- YES: GO TO: Step 3 Radiator Shutter Motor - V544-, CHECKING - 3 . -- NO: PERFORM: Visual Inspection of wiring and component. CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 4 Radiator Shutter Motor - V544-, CHECKING - 4 .
3	REMOVE: Engine Control Module - J623-. Refer to appropriate Service Information. CHECK: Radiator Shutter Motor - V544- harness connector T4bv / 2 to the Engine Control Module - J623- harness connector T91a / 12 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	-- YES: REPLACE: Radiator Shutter Motor - V544-. Refer to appropriate Service Information. GO TO: Step 4 Radiator Shutter Motor - V544-, CHECKING - 4 . -- NO: PERFORM: Visual Inspection of wiring and component. CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 4 Radiator Shutter Motor - V544-, CHECKING - 4 .
4	Final Procedure Perform a road test to verify repair. -- Does the original DTC return?	-- YES: CHECK: Engine Control Module -J623- harness connector for any damaged, pushed-out pins. REPAIR: As necessary. If all electrical connections are OK: REPLACE: Engine Control Module -J623-. Refer to appropriate Service Information. Clear the DTC's. Refer to DIAGNOSTIC MODE 04 -- ERASE DTC MEMORY -->. Repair is complete. Generate Readiness Code. Refer to READINESS CODE . Return vehicle to Customer. -- NO: Perform the diagnostic procedure for any DTC's. If no DTC's return, the repair is complete. Return vehicle to customer.