audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

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Leak Detection Pump

Specified value

LDP) -V144- terminals
1 + 3

640-720 Ohms

2 + 3

15-17 Ohms

If specified values are not obtained:

-

Replace Leak Detection Pump (LDP) -V144-

If specified values are obtained:

-

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.

Requirement

-

Fuse for Leak Detection Pump (LDP) OK

-

Disconnect connector at Leak Detection Pump (LDP).

-

Connect VAG1527B voltage tester as follows:

Electrical harness

Measure to

connector 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.

Checking output wire

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