Diesel Emissions Fluid Pump: Service and Repair

Reducing Agent Pump V437

• The "NOx reducing agent AUS 32" (AdBlue(R)) is simply called reducing agent in the following information.

• The reducing agent can irritate skin, eyes and the respiratory system.

• If the fluid comes into contact with skin, rinse the affected area immediately with plenty of water.

• If necessary, consult a physician.

Special tools, testers and auxiliary items required

• Torque Wrench (40-200 Nm) (V.A.G 1332)

Removing

- Remove the reducing agent tank. Refer to => [ Reducing Agent (AdBlue(R)) Tank ] Reducing Agent (AdBlue(R)) Tank.

Protect the connectors, for example with a plastic bag or cable ties, before they become coated with reducing agent. The connectors could be damaged because the reducing agent has a tendency to seep and it crystallizes.

Make sure the reducing agent does not come into contact with clothing or the vehicle body.

If this occurs, wash immediately with clean water and then dry with a lint-free cotton cloth.

If the reducing agent has already crystallized, use warm water and a sponge.

Reducing agent that is not removed will crystallize and can damage the affected surface.

- Release and disconnect the connector - arrows - on the reducing agent pump.






- Remove the bolts - A -.

- Unlatch and disconnect the connectors - 2 and 3 -.

Seal the openings on the line and the connections immediately with plugs to prevent contaminants from entering. Even tiny particles can cause serious damage to the system.

- In order to perform the following, disconnect the delivery agent line - 1 -.






- First, press the wire connection circlip in the - direction of the arrow 1 - as shown and then remove the delivery line in the - direction of the arrow 2 - without using special tools or pulling too sharply.






- Remove the reducing agent pump upward.

Installing

Install in reverse order of removal. When doing this note the following:

- Wash any leaking reducing agent off with water.

- Position the reducing agent pump and connect the connectors - 2 and 3 -.

- Tighten the bolts - A -.

- Connect the connectors - arrows - to the reducing agent pump and connect the delivery line - 1 -.






- Install the reducing agent tank. Refer to => [ Reducing Agent (AdBlue(R)) Tank ] Reducing Agent (AdBlue(R)) Tank.

- Check for leaks. Refer to "Guided Functions" in the vehicle diagnostic tester.

Tightening Specifications