Hydraulic Control Unit: Removing

WARNING: This page does not describe the selected car, but rather 19 other vehicles, including the 2017 Audi S5, 2016 Audi S5, 2015 Audi S5, 2015 Audi RS 5, and 2014 Audi S5. However, it is still accessible from the selected car via links, so may be relevant.

Turn off the ignition.

-- Place the vehicle on a hoist.

-- Slightly lower the rear section of the exhaust system and secure it, or if necessary, remove it. Refer to the appropriate service information .

NOTE:

A second technician will be needed to help remove the rear section of the exhaust system.

Remove the bolts -arrows- and remove the wiring harness bracket -1- from the rear final drive.

Fig 1: Identifying Rear Final Drive Wiring Harness Bracket

Courtesy of AUDI OF AMERICA, LLC

NOTE:

Mark the connectors -2- for the oil pressure/temperature sensor -- and on the clutch valves --.

-- Mark the connectors -2- on the oil pressure/temperature sensors -- and on the clutch valves --.

-- Disconnect the connector -4- from the all wheel drive (AWD) pump -V415-.

-- Unclip the wiring harness -3- from the final drive and the subframe -5 through 7- and tie it up.

-- Place the drip tray under the rear final drive.

-- Drain the ATF. Refer to ATF IN REAR FINAL DRIVE 0BF AND 0BE, DRAINING .

-- Drain the gear oil. Refer to GEAR OIL IN REAR FINAL DRIVE 0BF AND 0BE, DRAINING .

-- Remove the AWD pump. Refer to PUMP .

NOTE:

Remove the AWD pump in order to loosen and tighten the nut for the right pipe on the hydraulic control unit. See Fig 2.

Loosen the left -6- and right -7- pipes on the hydraulic control unit -1- one turn -arrows A- and then remove them from the chambers -arrows B-

Fig 2: Identifying Hydraulic Control Unit

Courtesy of AUDI OF AMERICA, LLC

-- Remove the bolts -2 through 5- and remove the hydraulic control unit -1- with the seal.