Audi A8 2019 Service Training page 42

Start-stop system
The start-stop system is activated automatically whenever
the ignition is switched on. It helps to save fuel and
reduce C0 emissions. If the requirements for start-stop
2
operation have been met, the engine is shut off automati-
cally when the brake is applied as the vehicle rolls to a
stop. One of these conditions is that the selector lever is
not in position R. The engine is automatically restarted
when required. The requirements for this are a very short
start time and quick readíness for drive-away. In the Audi
A8 with MHEV equipment, quick readiness for drive-away
is ensured by Transmission Fluid Auxiliary Hydraulic Pump
1 V475. If the auxiliary hydraulic pump is unable to circu-
late ATF because the overload cut-out has actuated or a
fault has occurred, the start-stop function is deactivated
and is no longer available.
System inactive (switched off) conditions:
› Uphill or downhill gradient: > 10%
› Max. speed:
› 105.6 mph (170 km/h)
› ESC is deactivated.
› Selector position S is selected.
› tiptronic mode is activated via the tiptronic gate or by
selecting Tip- with the tiptronic paddle on the steering
wheel.
› No ATF circulation by Transmission Fluid Auxiliary
Hydraulic Pump 1 V475 due to overload protection
function or fault.
Reference
The shift schematic of the 0D5 transmission is identical to that of the 0BK and 0BL transmissions, refer to eSelf-Study Program
950103, The 2011 Audi A8 Driver
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Assistance.