Audi Workshop Service and Repair Manuals

Wheel pulse test Speeds of left and right wheel are displayed during wheel pulse test. Detection of change in direction (forwards/backwards) is also checked. Test requirements: l  Driving straight ahead at a speed of > 20 km/h l  Reverse for about 3 metres for reverse gear detection –  Select menu item “WHEEL SENSOR” with Cursor keys. Indicated on display:

SYSTEM TEST
>	PARAMETERS WHEEL SENSOR COMPASS REAR VOLTAGE INTERNAL

–  Confirm selection by pressing ENTER key. Indicated on display:

DRIVE AT CONSTANT SPEED AND COMPARE
>	CONTINUE

–  Press ENTER key to continue. Indicated on display:

BOTH WHEEL SPEEDS
>	OK

–  Use ENTER key to confirm “OK” display. Indicated on display:

L: 0.0 R: 0.0
>	YES NO

–  Start engine and drive forwards in a straight line. Whilst doing so, compare displays for left (L) and right (R) wheel sensors.   Note! t  Difference between speed of left (L) and right (R) wheel in lower speed range must not exceed 5 km/h. t  If difference exceeds 5 km/h, check output signals of ABS control unit → Running gear; Rep. Gr.45. t  Wheel pulse test must be repeated → Chapter. –  Bring vehicle to a halt. –  If values are within permitted range, press ENTER key to confirm “YES” display. Indicated on display:

REVERSE SHORT DISTANCE
>	OK

–  Engage reverse gear. –  Reverse for about 3 metres and stop the vehicle. –  Use ENTER key to confirm “OK” display. If test is OK, process continues with compass test → Chapter. In the event of a reverse gear detection fault: Indicated on display:

REVERSE TRAVEL NOT DETECTED
>	OK

–  Use ENTER key to confirm “OK” display. –  Use current flow diagram to check reversing light switch signal and repeat wheel pulse test → Chapter.