Water Pump: Testing and Inspection

Coolant feed pump (V51), checking

Special tools, equipment, test and inspection devices; required accessories





- VAG 1527 B Voltage tester





- VAG 1594 A auxiliary measuring tool set

Test conditions





- Fuse # 16 OK

Test sequence
- Disconnect two-way connector from coolant feed pump -V51-.





- Connect contacts on coolant feed pump -V51 - with battery using auxiliary cables from VAG 1594 A.
The pump should start.
If the pump does not start:
- Replace pump -V51-.
If the -V51- starts:
- Switch ignition off and on.





- Connect VAG 1527 B diode test lamp to disconnected attachment plug of coolant feed pump -V51- using auxiliary cables from VAG 1594 A.
The LED should illuminate.

Note: This test must be conducted within 10 minutes of the time that the ignition was turned off

If the LED does not illuminate:
- Using wiring diagram find and repair open circuit.