Hydraulic Control Unit, Removing And Installing: Removing

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2016 Audi S4, 2016 Audi A4 Quattro, 2015 Audi S4, 2015 Audi A4 Quattro, and 2014 Audi S4. However, it is still accessible from the selected car via links, so may be relevant.

The ignition is off.

-- Place the vehicle on a lift.

-- Lower the back section of the exhaust system just a little and secure it. If necessary remove the back section of the exhaust system. Refer to EXHAUST PIPES/MUFFLERS for engine code CALA, EXHAUST PIPES/MUFFLERS for engine codes CCBA, CGXC, CTUB, or EXHAUST PIPES/MUFFLERS for engine codes CAED, CAEB, CPMB, CPMA .

NOTE:

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

-- If equipped, 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 Oil Pressure/Temperature Sensor -- and the Clutch Valves -- connectors -2-.

-- Disconnect the connectors -2- from the Oil Pressure/Temperature Sensor -- and the Clutch Valves --.

-- Disconnect the connector -4- from the All Wheel Drive Pump -V415-.

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

-- Place the Drip Tray under the rear final drive.

-- Drain the ATF from the rear final drive. Refer to ATF ON REAR FINAL DRIVE 0BF AND 0BE, DRAINING .

-- Drain the gear oil from the rear final drive. Refer to GEAR OIL ON REAR FINAL DRIVE 0BF AND 0BE, DRAINING .

-- Remove the All Wheel Drive Pump -V415-. Refer to All Wheel Drive Pump -V415-, REMOVING AND INSTALLING .

NOTE:

The All Wheel Drive Pump -V415- must be removed in order to loosen and tighten the nut on the right line to the hydraulic control unit. Refer to "Loosen the left -6- and right -7- lines to the hydraulic control unit -1- one turn -arrows A- and remove them from the chambers -arrows B-" (See Fig 2).

-- Loosen the left -6- and right -7- lines to the hydraulic control unit -1- one turn -arrows A- and 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.