After-Run Coolant Pump: Testing and Inspection

After-Run Coolant pump -V51-, checking
Special tools and equipment





^ VAG1527 B Diode test lamp





^ VAG 1594 A Adapter set
^ Wiring diagram





Test conditions
^ All fuses must be OK.

Test sequence
- Remove center insulation tray
- Pull 2-pin connector off After-Run Coolant pump -V51- -arrow-.





Checking function
- Connect contacts of After-Run Coolant pump -V51- to battery using adapter cables from VAG 1594.
After-Run Coolant pump -V51- must start.

If the coolant pump does not start:
- Replace After-Run Coolant pump -V51-.
If the coolant pump starts:

Checking activation
- Switch ignition off and on again.





- Connect diode test lamp VAG 1527 B to disconnected connector for After-Run Coolant pump -V51- with adapter cables from VAG 1594 A LED must light up.

Note: This check must be performed within 10 minutes after switching ignition off.

If the LED does not light up:
- Locate and eliminate open circuit referring to wiring diagram:
=>Electrical Wiring Diagrams, Troubleshooting & Component Locations