Passat Sedan 4Motion V6-2.8L (ATQ) (2003)
Water Pump: Testing and Inspection
After-run coolant pump -V51-
The after-run coolant circulation pump -arrows- is generally activated for 10 - 12 minutes about 15 seconds after ignition is shut off. If the coolant
temperature is above 92 C, the radiator fan -V7- will also be turned on.
Special tools and equipment
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Hand multimeter VAG 1526 or multimeter VAG 1715
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Wiring diagram
Check conditions
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Fuse 34 must be OK.
Test sequence
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Start engine and idle briefly.
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Switch ignition off.
Continued coolant circulation pump (V51) must start after about 15 seconds.
If pump does not run:
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Pull 2-pin connector off pump.
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Attach multimeter for measuring voltage to contacts 1+2 of connector.
Specification: 11 - 15V
If the specification is obtained:
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Replace continued coolant circulation pump.
If no voltage is present:
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Check wiring from relay plate to continued coolant circulation pump.