Transmission Overload Protection Function

Transmission Overload Protection Function




Shown on Engine 119
B2/5 Hot film MAFsensor
L5 Crankshaft position sensor
N3/10 ME-SFI control unit
N15/3 ETC control unit
T1/1-T1/8 Ignition coils, cylinder 1 to 8
CAN Data bus

Task
Protecting the shift elements of the automatic transmission from excessive thermal stresses during power shifts in the upper engine speed range.

Design/function
Engine torque is reduced by briefly retarding the ignition during the gearshifts. The ME-SFI control unit is supplied with a signal over the CAN databus by the ETC control unit (N15/3) for this purpose.