Hydraulic Control Unit, Removing And Installing, 0BE, 0BF: Installing

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Fig 1: Identifying Hydraulic Control Unit

Courtesy of AUDI OF AMERICA, LLC

NOTE:

Follow all safety precautions exactly when replacing the hydraulic control unit. Install the "old" sensors again if possible. Refer to SAFETY PRECAUTIONS AND TEST PROCEDURES .

Conditions:

Replace the seal between the hydraulic control unit -1- and the final drive housing.
The centering pins must be installed inside the housing for the hydraulic control unit. Refer to -item 18- Hydraulic Control Unit Housing (See Figure).
The left -6- and right -7- lines must be installed loosely when attaching the hydraulic control unit -1-.

Attach the hydraulic control unit -1- to the rear final drive as follows:

First install the lines -6 and 7- into the chambers hand-tight -arrows B-.

Then install the bolts -2 through 5- hand-tight. One bolt -2- has a permanent seal on the head. Coat the thread with Sealing Compound D 176 501 A1.

Tighten the M8 x 30 bolts -2 through 5- to the tightening specification in the sequence: -4-, -2-, -5- and -3-.

Tighten the nuts -A arrows- and -B arrows- on the left -6- and right -7- lines to the tightening specification.

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

-- Install the wiring harness -3- to the final drive and subframe -items 5 through 7-.

Fig 2: Identifying Rear Final Drive Wiring Harness Bracket

Courtesy of AUDI OF AMERICA, LLC

-- Connect the connectors -4 and 2-. Pay attention to the marks made during the removal, that identify the allocation to the Oil Pressure/Temperature Sensor -- and which connectors go to the Clutch Valves --.

-- If equipped, position the wiring harness bracket -1- on the rear final drive and tighten the bolts -arrows- to the tightening specification. Make sure the wiring harness -3- does not get pinched.

NOTE:

Allocation for the Oil Pressure/Temperature Sensor -- and Clutch Valves -- connectors:

Fig 3: Identifying Oil Pressure/Temperature Sensor Connectors

Courtesy of AUDI OF AMERICA, LLC

-1- = Oil Pressure/Temperature Sensor 2 -G640- Connector

-2- = Oil Pressure/Temperature Sensor -G437- Connector

-3- = All Wheel Drive Clutch Valve 2 -N446- Connector

-4- = All Wheel Drive Clutch Valve -N445- Connector

-- Fill the rear final drive with gear oil and then check the level. Refer to GEAR OIL, CHECKING LEVEL, 0BE, 0BF .

-- Fill with ATF in the rear final drive and check the ATF level. Refer to ATF LEVEL, CHECKING, 0BE, 0BF .

-- Install the rear section of the exhaust system and align it so it is free of tension. Refer to EXHAUST PIPES/MUFFLERS for engine code CALA, EXHAUST PIPES/MUFFLERS for engine codes CAED, CAEB, CPMB, CPMA, or EXHAUST PIPES/MUFFLERS for engines CCBA, CGXC, CTUB .