After-run coolant pump, checking

WARNING: This page is about a different car, the 2004 Volkswagen R32. However, it is still accessible from the selected car via links, so may be relevant.

Special tools, testers and auxiliary items required

Fig 1: Voltage Tester V.A.G 1527B

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Voltage tester V.A.G 1527B

Fig 2: Connector Test Set V.A.G 1594C

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Connector test set V.A.G 1594C
Wiring diagram

Test conditions

Fig 3: Identifying Main Fuse Panel

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Fuse 16 must be OK.

Test sequence

Remove sound insulation pan, along with left and right sides: Refer to 50 BODY, FRONT

Fig 4: Locating After-Run Coolant Pump V51

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Disconnect the 2-pin connector from the After-Run Coolant Pump V51 - arrow -.

Fig 5: Contacts Of After-Run Coolant Pump V51 Connected To Battery

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Connect contacts of after-run coolant pump V51 to battery, using adapter cables from connector test set V.A.G 1594C. After-run coolant pump must start running.

If after-run coolant pump V51 does not start running:

Replace after-run coolant pump V51.

If after-run coolant pump V51 does starts running:

Turn the ignition off and then on again.

Fig 6: After-Run Coolant Pump V51 Connector

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Connect voltage tester V.A.G 1527B to disconnected connector of after-run coolant pump V51, using adapter cables from connector test set V.A.G 1594C. LED must light up.

NOTE:

This test must be performed inside of 10 min. after the ignition has been switched off.

If LED does not light up:

Determine and eliminate open circuit according to electrical schematics: Refer to Electrical Wiring Diagrams, Troubleshooting and Component Locations