audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Leak Detection Pump, Evaporative System|Locations|Page 3257 > < Leak Detection Pump, Evaporative System|Locations|Page 3255
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Connect multimeter for resistance measurement as follows.

Leak Detective Pump (LDP)

Specified value

-V144- terminals

1+3

640 - 720 Ohms

2+3

15 - 17 Ohms

If specified values are not obtained:

-

Replace Leak Detection Pump (LDP) -V144-. See: Service and Repair  

If specified values are obtained: 

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Check voltage supply at harness connector of Leak Detection Pump (LDP). 

Checking voltage supply

NOTE:  Voltage supply for the Leak Detection Pump (LDP) runs via the Fuel Pump (FP) relay.

Test requirement

-

Fuse for Leak Detection Pump (LDP) OK

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Disconnect connector at Leak Detection Pump (LDP).

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Connect VAG1527B voltage tester as follows:

Electrical harness connector

Measure to

terminal

3

Engine Ground (GND)

-

Operate starter briefly.

-

LED must light.

If LED does not light:

-

Check electrical wire connection from terminal 3 via fuse to Fuel Pump (FP) relay for open circuit.

-

Repair open circuit if necessary.

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