GF07.61-P-4023MFW ME-SFI Transmission Shift Delay, Function

GF07.61-P-4023MFW ME-SFI Transmission Shift Delay, Function
- ENGINES 271.910 in MODEL 204.044 /045 /245
- with CODE (423) Automatic five-speed transmission (NAG)
- ENGINES 271.950 in MODEL 204.041 /241
- with CODE (423) Automatic five-speed transmission (NAG)
- as of model year 2009 /AEJ 08
- ENGINES 271.952 in MODEL 204.046 /246
- with CODE (423) Automatic five-speed transmission (NAG) as of model year 2009 /AEJ 08

Function requirements for transmission shift delay, general points
- Circuit 87M ON (engine control ON)
- Engine running
- Coolant temperature at start less than 50°C
- Vehicle speed less than 53 km/h

Transmission shift delay, general points
The transmission shift delay warms up the firewall catalytic converter more rapidly to its operating temperature after engine start.

The ME-SFI control unit (N3/10) regulates the transmission shift delay according to the following sensors and signals:
- Coolant temperature sensor (B11/4)
- Electronic Stability Program control unit (N30/4), vehicle speed over the chassis CAN (CAN E)

Function sequence for transmission shift delay
Transmission shift delay is active for a maximum of 160 s and is entirely electronic.
The ME-SFI [ME] control unit makes a request to the electronic transmission-control control unit (N15/3) via the drive train CAN (CAN C) to shift the shift characteristic curves.

Partial load gear shifts (1-2-1, 2-3-2) thus take place at higher engine speeds or at higher vehicle speeds.