BMW F97 Technical Training Manual page 42

F97/F98￿Complete￿Vehicle
4.￿Powertrain
Temperature￿monitoring
A￿total￿of￿3￿temperature￿sensors￿are￿installed.￿The￿temperature￿of￿the￿control￿unit￿(driver￿output￿stage),
the￿temperature￿of￿the￿electric￿motor￿and￿the￿transmission￿oil￿temperature￿are￿monitored.
The￿temperature￿thresholds￿are:
• Control￿unit￿85 °C￿(185 °F)
• Electric￿motor￿160￿°C￿(320￿ °F)
• Oil￿temperature￿190 °C￿(374￿°F)
4.3.8.￿Service￿information
• If￿the￿M￿GHAS￿control￿unit￿is￿replaced,￿coding￿(activation￿of￿a￿vehicle-related￿characteristic
curve)￿and￿then￿initial￿calibration￿are￿necessary,￿after￿which￿the￿fault￿memory￿must￿be￿erased.
• After￿the￿replacement￿of￿the￿entire￿M￿rear￿axle￿differential￿a￿calibration￿must￿be￿performed￿and
then￿the￿fault￿memory￿must￿be￿deleted.
• If￿the￿electric￿motor,￿the￿electric￿motor￿and￿intermediate￿gearing￿or￿the￿oil￿temperature￿sensor
is￿replaced,￿erasing￿the￿fault￿memory￿is￿all￿that￿is￿required.
The￿rear￿differential￿fluid￿is￿currently￿replaced￿at￿2000 km￿(1200￿mile￿running-in￿check)￿and￿every￿3rd
engine￿oil￿change.
Because￿of￿the￿change￿of￿clutch￿plate￿material￿to￿one￿with￿carbon￿content￿on￿the￿F90￿and￿F97/F98,
a￿new￿differential￿fluid￿is￿used.￿The￿initial￿filling￿is￿with￿Fuchs￿Titan￿5037B.
Current￿rear￿axle￿differential￿box￿oil￿recommendations￿and￿capacities￿can￿be￿found￿in￿the￿current
documentation￿of￿the￿BMW￿workshop￿information￿systems.
If,￿due￿to￿a￿fault,￿the￿M￿GHAS￿lock￿function￿is￿switched￿off￿or￿fails,￿a￿blocked￿differential￿is￿automatically
reopened￿as￿the￿lock￿function￿is￿not￿self-locking.￿The￿driver￿is￿warned/informed￿and￿the￿following
effects￿can￿be￿expected:
1.￿Deterioration￿of￿traction￿with￿dynamic￿driving￿style￿and￿low￿coefficients￿of￿friction,
particularly￿with￿different￿coefficients￿of￿friction,￿left/right.
2.￿Possible￿deterioration￿of￿stability￿in￿dynamic￿driving￿situations.
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