Requirements for test

The vehicle must be equipped with the approved wheels and tire sizes, which must be the same on all four wheels. Check inflation pressures all round.
Brake system mechanical and hydraulic parts must be in order: No leaks in hydraulic lines or connections (visual inspection of hydraulic unit, brake calipers, wheel cylinders, tandem master brake cylinder).
Wheel bearings and wheel bearing play OK.
Wheel speed sensors must be installed correctly.
Supply voltage must be OK (not less than 10.0 V).
Connector on ABS control module (w/EDL) -J104- must be properly attached, with retainer catch engaged.
The diagnostic procedure can only be started with the vehicle stationary and the ignition switched on (or with engine running). The diagnosis cannot be started if wheel speed exceeds 2.75 km/h, and will be terminated if the speed exceeds 20 km/h.
When testing the ABS/EDL and ASR systems, ensure that the vehicle's electronics are not subjected to electromagnetic interference: keep the vehicle away from equipment with a high current draw, such as electric welding units.