volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Leak Detection Pump, Evaporative System|Testing and Inspection|Page 5886 > < Evaporative Emission Control Canister|Service and Repair|Page 5882
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Leak Detection Pump: Testing and Inspection

Diagnostic Procedures

Leak Detection Pump, Checking

Special tools, testers and auxiliary items required

‹› Multimeter.

‹› Wiring diagram.

Test requirements

‹› The Leak Detection Pump (LDP) (V144) fuse is OK.

‹› The engine must be completely cooled down. IAT must match ECT within 5 Degrees C in order for the LDP to operate. Let sit overnight if

possible when testing for voltage to the pump motor.

‹› The ignition switched OFF.

Test procedure

-

Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Computers and Control Systems/Testing
and Inspection/Scan Tool Testing and Procedures/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 -.

Checking internal resistance

-

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

Leak Detection Pump, Evaporative System|Testing and Inspection|Page 5886 > < Evaporative Emission Control Canister|Service and Repair|Page 5882