How to replace Generation 4 Filter and/or Pump

How to Replace the Filter (VW / Audi Group)

• Remove cover from filter housing via the 2 Allen bolts, pull cover off with slip joint pliers.
• Clean any salt around the edge of the white nylon retainer using pointed item such as Stanley blade, do not damage the aluminium housing.
• Put oil drain tray underneath the filter/pump assembly.
• Connect laptop with VAGCOM/VCDS to car, turn on ignition, select “AWD Unit 22” from the “Select Control Module” page. (or use screw method in video)
• Select “Output Tests – 03”, then keep clicking “Start / Next” until you see “Haldex Clutch Pump (V181) Activate”, then click again. (or use screw method in video)

Screw Method for Gen 4 Filter Removal

• The pump should run, you will see a current value in amps in the measure block increase from 0.00 to maybe 2.00. (or use screw method in video). Watch the youtube video of driving the filter out below:

• When you can hear the oil drizzling into the drain tray, then turn off the ignition.
• Now go back under the car, the filter retainer will be sticking out by approximately 10mm.
• You can now pull the white nylon filter retaining spindle out with some pliers/grips.
• Now fish out the freely moving filter cartridge from the hole, maybe use some long nose pliers if your fingers cannot grab it.
• Clean out any debris from the housing with blue roll etc.

• • Drain Haldex oil from drain point as per diagram “labelled B”

• *******(If pump is being replaced follow instructions here for pump)********
• Insert the new filter cartridge/retainer and plate assembly in one piece, ensure you lubricate the rubber O rings first.
• Some force is required to overcome the friction of the O Rings. If this force is getting excessive, clean the aluminium housing of any corrosion using a blade or abrasive, but ensure you plug the housing with blue roll or rags to stop any debris from entering the chamber and clean out afterwards as required.
• Overcoming the friction of the first O ring requires force, but to overcome the second O rings friction use the 2 bolts for the filter cover. Gently pull in the filter using both Allen bolts a little at a time.
• Ensure drain bolt “labelled B” has been refitted.
• Remove fill point bolt “labelled A” – before removing clean out any corrosion from Allen head, ensure Allen key/socket fits correctly with good penetration.
• Fill with Haldex high performance coupling oil until fluid is level/over flowing from fill point.
• THEN CARRY ON WITH PURGING/BLEEDING THE SYSTEM AT BOTTOM OF PAGE

How to Replace the Pump (VW / Audi Group)

Firstly follow the instructions for filter change, until you reach:-
“*******(If pump is being removed follow instructions here for pump)******** Then.…”

• Disconnect both electrical connectors on top of haldex ECU
• Remove Haldex ECU via 2 Allen bolts
• Remove 2 Allen bolts from pump.
• Twist pump to break the friction fit of internal rubber O rings.
• Withdraw the pump using twisting action while using a thin scraper in the gap as a lever to help withdraw pump from the housing.
• Once pump is removed, cut the cable above the pump.
• Pull pump cable/connector out from ECU side.
• Unlock/unlatch plastic cable clips (x3) on the top/side of haldex coupling.
• Clean out any debris from the pump housing.
• Lubricate rubber O rings on the new pump assembly.
• Fit new pump into housing ensuring the strainer gauze is at the bottom. (correctly rotated)
• Feed cable over the top of haldex coupling, clipping cable into existing 3 x cable clips.
• Refit haldex ECU, and reconnect both electrical connectors on the ECU.
• Continue Filter instructions + Bleed/Purge Instructions

How to Bleed / Purge the Haldex System (VW / Audi Group)

• Connect laptop with VAGCOM/VCDS to car, turn on ignition
• Select “AWD Unit 22” from the “Select Control Module” page.
• Select “Output Tests – 03”, then keep clicking “Start / Next” until you see “Haldex Clutch Pump (V181) Activate”, then click again.
• Run the Haldex pump for 1 minute, then press next to engage “All wheel drive (AWD) Clutch Engaged” – this opens the valve. Keep this running for 3 minutes.
• You will hear the air locks being pumped from the system, the pumps tone will fluctuate.
• Press next to disengage the Clutch valve, then next to disengage the pump. Keep pressing next to close the window. Close “22 – AWD” window and turn off ignition.
• Now repeat this process further twice until the pump makes a consistent sound indicating air locks have been purged.
• Now top up the oil until fluid is level/over flowing from fill point.
• Replace fill point bolt “labelled A”
• Expect to insert approximately 700ml of oil in total.
• Connect laptop with VAGCOM/VCDS to car, turn on ignition, select “AWD Unit 22” from the “Select Control Module” page.
• Click on “Fault Codes – 02”, clear any remaining fault codes on the unit.

THEN CONTINUE WITH TESTING THE SYSTEM

Test drive the car, find a safe and legal place to launch the car on slippery ground multiple times, ensure the 4wd system is working.
On low performance vehicles you may have to find a grass or other low friction surface to test 4wd system.

After multiple tests of the 4wd system, connect laptop with VAGCOM/VCDS to car, turn on ignition, select “AWD Unit 22” from the “Select Control Module” page. Click on “Fault Codes – 02”, ensure no fault codes have been triggered.