After-Run Coolant Pump V51 , checking

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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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All fuses must be OK.

Test sequence

Pull off 2-pin connector from After-Run Coolant Pump V51.

Fig 4: 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 V51 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 ignition off and then on again.

Fig 5: After-Run Coolant Pump V51 Connector

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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 5 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