Self-Study Program

44
Note
Due to torque converter slip, the gearbox
input speed (turbine speed) is not equivalent
to the engine speed (except when the torque
converter lockup clutch is fully closed).
367_116
367_059
367_046
Gearbox control unit
Gearbox input speed sender G182
G182 is integrated in the ATF pump housing and
measures the direct gearbox input speed (turbine
speed) by means of a ring gear on the gearbox
input shaft.
The electronic gearbox control requires the exact
turbine speed for the following functions:
– Control, adaption and monitoring of gearshifts
and gear selection
– Regulation and monitoring of the converter
lockup clutch
– Diagnosis of the shift elements and plausibility
checking of engine RPM and gearbox output
speed
Bottom view of gearbox
Protective/substitute function in case of failure:
– Engine RPM is used
as a substitute value
– No adaption of gearshifts
– No controlled operation of converter lockup
clutch (open or closed only)
– No pressure regulation when selecting gear
(e.g. N-D or N-R), -clunky- shift action
Gearbox input speed sender G182
Gearbox input shaft
(turbine shaft)
ATF pump
Stator shaft
Gearbox input speed sender G182
Connector for gearbox input speed
sender G182
Gearbox input shaft
(turbine shaft)
Milled recesses for
engine speed sensing