OEM Haldex Information

The OEM and Aftermarket Haldex Controllers have a tendency to deactivate themselves from time to time due to one of many reasons. It could be as simple as a loose plug or oil change or something more sinister.

 I have had many problems with the 4WD on my car and have come across many other people with similar problems. It's a real shame having a 4Motion or R32 and not being able to use the 4WD on them.

This page is full of information I have picked up while trying to fix the never-ending problem of the 4WD. I hope it helps you guys out as much as it's helped me... good luck!

The Haldex Oil & Filter

To check the oil temperature use VAG COM Group 050, the temperature should be 20oC - 40oC

Change Haldex Oil every 20,000
Change Haldex Filter every 40,000
- Click Here for Haldex Servicing Information -

The Haldex Sensors

The Haldex System uses 6 main sensors to make sure everything's ok. If any of these sensors are faulty or give a reading outside the correct range; the 4WD will de-activate and you'll only be running a 2WD car.

 

 Sensor Is the error Shown on VAG COM 'Auto-Scan' ?
1) Engine Speed Sensor Yes
2) Acceleration / Throttle  Position Sensor Yes
3) Wheel Speed Sensors (x4) Yes
4) Longitudinal Acceleration Sensor Yes
5) Brake Light Switch Yes
6) Handbrake Switch No

Click on the link on the right for more details

Diagram & Info on sensors attached to Haldex Controller

Information on OEM Haldex System (pdf) - 1.98MB

(most of the information on this page is on the pdf file above)
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