Radiator Fan - VX57-, Checking

General Description

The Radiator Fan -VX57- is used to dissipate the waste heat produced during vehicle operation to the ambient air via the radiator. For this purpose, the Radiator Fan -VX57- produces a directed mass air flow, the flow rate of which is controlled with the radiator fan control module. The required mass air flow is adjusted to ambient conditions and the cooling power requirement of individual components of the cooling system (e.g. internal combustion engine). A malfunction of the electric radiator fan can have an impact on the temperature management of the internal combustion engine.

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 Fan - VX57-, CHECKING - 2 . -- NO: GATHER more information from customer about the complaint.
2	IGNITION: OFF. DISCONNECT: Radiator Fan -VX57- harness connectors. IGNITION: ON. CHECK: Radiator Fan -VX57- harness connector T4bo / 1 and 2 to 4 for voltage. CHECK: Radiator Fan -VX57- harness connector T4bp / 2 and 3 to 1 for voltage. IGNITION: OFF. SPECIFIED VALUE: Battery voltage. -- Were Values obtained?	-- YES: GO TO: Step 3 Radiator Fan - VX57-, 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 Fan - VX57-, CHECKING - 4 .
3	REMOVE: Engine Control Module - J623-. Refer to appropriate Service Information. CHECK: Radiator Fan -VX57- harness connectors T4bo / 3 and T4bp / 4 to the Engine Control Module - J623- harness connector T91a / 73 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	-- YES: REPLACE: Radiator Fan -VX57-. Refer to appropriate Service Information. GO TO: Step 4 Radiator Fan - VX57-, 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 Fan - VX57-, 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.