Self-Study Program

48
G93 is integrated inside the valve assembly and
is swept by ATF. It generates an ATF temperature
signal for the automatic gearbox control unit J217.
Gearbox control unit
Gearbox oil temperature sensor G93
G93 is an NTC resistor and an integral part of the
wiring harness.
(NTC - Negative Temperature Coefficient)
The ATF temperature is required for the following
functions:
– To adapt the shift pressures (system pressure)
and to increase and reduce pressure during
gearshifts.
– To activate and deactivate temperature-
dependent functions (warm-up program,
converter lockup clutch, etc.).
– To activate gearbox protection measures if the
ATF temperature is too high (Hotmode).
– To activate the gearbox adaption functions
(EPCV control current).
O-ring
Gearbox oil temperature sensor G93
367_059
367_058
As protection against overheating, counter-
measures (Hotmode) are taken when defined
temperature threshold values are exceeded:
Hotmode stage 1 (approx. 150 °C): The shift
characteristics are adjusted towards higher
engine speeds using the DSP function.
The operating range within which the torque
converter lockup clutch is closed is extended.
Hotmode stage 2 (approx. 170 °C): Engine torque
is reduced.