This function measures the speed relationship between alternator and crankshaft which is used to learn terminal W ratio again.
Test conditions:
Ignition on, engine off.
Parking brake applied.
Gear selector in position N.
Battery voltage above 20V.
Procedure:
Start the function.
A dialogue shows the test conditions, check these.
A dialogue with "Start engine" is shown. Start engine and press "OK".
A dialogue box shows "Turn off ignition". Turn off ignition, press "OK".
A dialogue box shows "Turn on ignition". Turn on the ignition, press "OK".
A dialogue shows "Function done". Press "OK".
The function is done.
If the function fails, check the test conditions and repair any faults.