System Components on Front Axle

ABS components on front axle, checking, removing and installing
(ABS/EDL and ABS/EDL/ASR ITT Mark 20 IE)

Special tools and equipment




VAG1331 torque wrench





VAS1978 wiring harness repair kit

Shutter wheel for wheel speed sensor, checking; and right front/left front ABS wheel speed sensor -G45-/-G47-, removing and installing

- Remove wheel






- Rotate wheel hub and check gap between shutter wheel and wheel speed sensor for uniformity (run-out tolerance). Incorporate wheel bearing play into this test.

Run-out tolerance of the shutter wheel is 0.3 mm.

Replace the shutter wheel together with the wheel hub if a mechanical wheel speed sensor malfunction is diagnosed by the ABS control module (w/EDL) -J104- that is influencing its signal without authorization, no damage can be found at the wheel speed sensor and the run-out tolerance is not being maintained.

- Check shutter wheel of wheel speed sensor for soiling.

- Clean shutter wheel if shutter wheel holes are plugged with dirt.






- Disconnect harness connector -1- from wheel speed sensor wire and wheel speed sensor.

- Unscrew socket head bolt -2- for right and left front wheel speed sensors -G45-/-G47-.

- Remove right and left front wheel speed sensors -G45-/-G47-.

- Before inserting sensor, clean inner surface of sensor mount and coat with securing grease G 000 650.

- Insert ABS wheel speed sensors.

- Tighten socket head bolt -2- to 8 Nm.

- Connect harness connector -1-.

Installing front wheel speed sensor wiring






- Disconnect Mass Air Flow (MAF) sensor connector -1- from air duct of air filter.

- Remove bolts -2- at air filter -3- and set these aside on left.






- Disengage multi-pin connector and disconnect from control module.






- Loosen and remove cap of multi-pin connector using a screwdriver.






- Disengage secondary engagement device (violet) in direction of arrow using small screwdriver.






Terminal assignment of harness connector wiring harness / ABS control module (w/EDL) -J104-











- Using an appropriate prodding tool from VAS1978 wiring harness repair set, poke out the relevant terminals.

- Disengage connector at wheel speed sensor and disconnect harness connector.

- Remove faulty wheel speed sensor wire and thread new wheel speed sensor wire.

- Connect wire to wheel speed sensor.






Be sure not to twist wheel speed sensor wire in wheel housing when installing wheel speed sensor.






- Guide terminal into connector housing and push the single wire seal in until impact using an appropriate pushing tool from VAS1978.

- Secure terminals with the secondary engagement device and place multi-pin connector cap on this.