Valve Body: Service and Repair
WM 387719 Removing and installing electrohydraulic control unit
Tools
Technical values
Information
Overview of tightening sequence for hydraulic control unit
Always observe tightening sequence. The screw heads of the Torx screws used to secure the electrohydraulic control unit to the Porsche Doppelkupplung housing are slightly bigger (Torx T40) than the screws for the flange blocks of the electrohydraulic control unit.
Preliminary work
1. Move selector lever to position "P".
2. Raise the vehicle at the prescribed jacking points.
-> 4X00IN01 Lifting the vehicle Service and Repair
3. Remove underbody panelling.
-> 519419 Removing and installing rear cover - section on "Removing" 519419 Removing and Installing Cover for Rear Underbody
4. Drain ATF.
-> 370255 Changing ATF - section on "Draining" 370255 Changing ATF
5. Remove ATF oil pan.
-> 375519 Removing and installing ATF pan - section on "Removing" Service and Repair
Removing electrohydraulic control unit
Overview of tightening sequence for hydraulic control unit
1. Unscrew screws 16 and 18.
1.1. Pull off cable plugs on solenoid valves.
Disconnecting and connecting solenoid valves
Release cable plugs -arrow- and pull them off the solenoid valves -1, 2-.
Ensure absolute cleanliness.
1.2. Unscrew long screws and remove electrohydraulic control unit.
2. Screw two M6 x 95 mm screws => TORX SCREW approx. 10 mm into screw holes 18 and 16.
3. Unscrew the remaining screws in reverse tightening sequence and carefully set the electrohydraulic control unit down on the long screws.
4. Unscrew screw -2- (Torx T27) on electrohydraulic control unit -1- and pull out the temperature sensor -3-.
Removing and installing temperature sensor on switch unit
5. Carefully release cable plugs -1- and -2- and pull them off the solenoid valves.
Releasing connectors on solenoid valves
6. Unscrew long screws and remove electrohydraulic control unit.
Installing electrohydraulic control unit
Information
Before installing the electrohydraulic control unit, check the sealing surfaces of the control unit and the sealing surfaces of the transmission for damage and soiling. Damaged or soiled parts must not be used. Ensure absolute cleanliness when installing the electrohydraulic control unit.
Information
If the connector housing is damaged during removal, always replace it.
Overview of tightening sequence for hydraulic control unit
Information
The wire harness for the solenoid valves -3- and the cable for the temperature sensor -4- must be routed in the recess between the transmission housing -2- and electrohydraulic control unit -1- because otherwise the cables can become squashed, resulting in damage and malfunctions.
Wire harness routing
Information
If a new hydraulic control unit is installed, the transmission must be calibrated using the PIWIS Tester 9718.
1. Install electrohydraulic control unit.
1.1. Secure the electrohydraulic control unit to screw holes 16 and 18 using two M6 x 150 mm screws. Screw the screws 10 mm into the screw holes.
1.2. Install the temperature sensor at the electrohydraulic control unit.
Removing and installing temperature sensor on switch unit
Fit the temperature sensor -3- and screw in and tighten screw -2- on the electrohydraulic control unit -1-.
=> Tightening torque: 6 Nm (4.5 ftlb.)
1.3. Connect cable plugs at the solenoid valves.
Disconnecting and connecting solenoid valves
Connect cable plugs -arrow- to the solenoid valves -1, 2- and check that the cable plugs -arrow- are engaged correctly.
1.4. Install electrohydraulic control unit.
1.4.1. Check that the wire harness is positioned correctly after installing the electrohydraulic control unit.
1.4.2. Make sure that the electrohydraulic control unit is flat on the Porsche Doppelkupplung housing.
1.4.3. Fit and tighten screws -1 to 15- in the specified sequence.
1.4.4. Unscrew the long screws.
1.4.5. Fit and tighten screws -16 to 20- in the specified sequence.
1.4.6. Tighten screws -1 to 20-.
Step 1
=> Tightening torque: 1.5 Nm (1 ftlb.)+1.5 Nm (+1 ftlb.)
Step 2
=> Tightening torque: 8 Nm (6 ftlb.)
Subsequent work
1. Install ATF oil pan.
-> 375519 Removing and installing ATF pan - section on "Installing" Service and Repair
2. Fill in ATF.
-> 370255 Changing ATF - section on "Filling" 370255 Changing ATF
3. Check and if necessary, top up ATF.
-> 370235 Checking and topping up ATF 370235 Checking and topping up ATF clutch fluid
4. Install underbody panelling.
-> 519419 Removing and installing rear cover - section on "Removing" 519419 Removing and Installing Cover for Rear Underbody