Test Procedure

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK

Start diagnosis

-- Remove the right rear wheel housing liner. Refer to the Repair Information.

-- Disconnect the Leak Detection Pump (LDP) -V144- electrical harness connector -2-.

Fig 1: Disconnecting Leak Detection Pump (LDP) V144 Electrical Harness Connector

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Checking internal resistance

-- Using a multimeter, check the Leak Detection Pump (LDP) -V144- for resistance as follows:

Leak Detection Pump (LDP) -V144- electrical connector terminals:	Specified values:
1 to 2	134 to 153 Ω
1 to 3	134 to 153 Ω
1 to 4	99 to 118 Ω

If any of the specified values were Not obtained:

-- Replace the Leak Detection Pump (LDP) --V144--. Refer to the Repair Information.

If the specified values were obtained:

Checking voltage supply

NOTE: The voltage for the Leak Detection Pump (LDP) --V144-- is supplied via fuse 5 in Fuse Panel B.

-- Switch the ignition ON.

-- Using a multimeter, check the Leak Detection Pump (LDP) --V144-- electrical harness connector terminal 4 to engine ground for voltage.

Specified value: Battery voltage.

-- Switch the ignition Off.

If the specified value was Not obtained:

-- Using a multimeter, check the Leak Detection Pump (LDP) --V144-- wiring from terminal 4 to fuse.

Specified value: 1.5 Ω max.

If the specified value was Not obtained:

-- Check the wiring for high resistance, short to ground or an open circuit.

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-- If necessary, repair the faulty wiring connection and replace any open fuses.

If the specified voltage was obtained: