Audi A4: ATF Circuit

Overview - ATF Circuit

  Caution

Risk of damaging the transmission.

• Remove all the plugs on the ATF lines and on the transmission that were installed during removal.
• The ATF cooling function will not work and the transmission will be damaged if the plugs are forgotten.

  WARNING

The system is under pressure.

• Deactivate the ATF pump and drain the hydraulic pressure reservoir before opening the ATF circuit!
• Refer to → Chapter "ATF Pump, Deactivating and Draining the Hydraulic Pump Reservoir".

ATF cooler, ATF line

1 - O-Rings

• Replace after removing

2 - ATF Pipe

• Replace after removing

3 - O-Rings

• Replace after removing

4 - ATF Cooler

• Removing and installing. Refer to → Chapter "ATF Cooler, Removing and Installing".

5 - Guard Plate

• Depending on the version

6 - Bolt

• 8 Nm

7 - Bracket

8 - Bolt

• Tightening specification and sequence. Refer to → Fig. "ATF Cooler - Tightening Specification and Sequence".

9 - Bolt

• Tightening specification and sequence. Refer to → Fig. "ATF Cooler - Tightening Specification and Sequence".

10 - Coolant Hoses

11 - Bolt

• Tightening specification and sequence. Refer to → Fig. "ATF Cooler - Tightening Specification and Sequence".

ATF Cooler - Tightening Specification and Sequence

- Tighten the bolts in steps according to the specified sequence:

Drain and Plug

1 - Plug/Plugs

• Aluminum plug for the oil pan

• 8 Nm +30º
• Replace after removing

• Plastic plugs for the oil pan

• Tighten all the way

• For the ATF check and fill hole

2 - Plug

• For the transmission fluid inspection and fill hole
• Tightening Specification -item 2-

3 - Transmission Fluid Pump (MTF Pump)

• Must be removed for draining the transmission fluid (MTF). Refer to → Chapter "Transmission Fluid Pump, Removing and Installing".

4 - Bolt

• Tightening Specification -item 4-

5 - Plug/Plugs

• Aluminum plug for the oil pan

• 35 Nm
• Replace after removing

• Plastic plugs for the oil pan

• Tighten all the way
• For the ATF

ATF Cooler, Removing and Installing

Special tools and workshop equipment required

• Hose Clamps - Up To 25 mm -3094-
• Engine Bung Set -VAS6122-
• Hose Clip Pliers -VAS6362-
• Used Oil Collection and Extraction Unit -SMN372500-

Removing

  WARNING

The system is under pressure.

Deactivate the ATF pump and drain the hydraulic pressure reservoir before removing the ATF cooler!

- Using the Vehicle Diagnostic Tester in the Transmission Control Module -J217- empty the ATF pressure reservoir and disable the Transmission Fluid Auxiliary Hydraulic Pump -V552-. Refer to → Chapter "ATF Pump, Deactivating and Draining the Hydraulic Pump Reservoir".

- Drain the ATF. Refer to → Chapter "ATF, Draining and Filling".

  Note

To catch escaping coolant, place a cloth underneath.

- Loosen the hose clamps -1 and 2- and then disconnect and remove the coolant hoses with Hose Clamps - Up To 25mm -3094-.

- Place the Used Oil Collection and Extraction Unit -SMN372500- underneath.

- Remove the bolts -1, 2 and 3- and the bracket.

- Remove the ATF cooler -2- from the ATF pipe -1-.

- Seal the open lines and connections with clean plugs from the Engine Bung Set -VAS6122-.

- Remove the ATF pipe.

Installing

Install in the reverse order of removal while noting the following:

  Note

• Replace the ATF line with seals after removing.
• Clean the ATF cooler before installing.

  Caution

ATF cooler leak!

• Pay attention to the ATF pipe installation position.
• The side of the pipe with three seals faces the ATF cooler.

- Install the bolts all the way in by hand and tighten in the previously specified tightening sequence.

- Check the ATF level. Refer to → Chapter "ATF Level, Checking".

Tightening Specifications

• Refer to → Fig. "ATF Cooler - Tightening Specification and Sequence"

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