ME-SFI transmission shift delay, function - GF07.61-P-4023G

ENGINE 273 in MODEL 463.202/222/236/237 up to 31.5.12 as of model year 2009/YoM 08 

Fig 1: Identifying ME-SFI Transmission Shift Delay Function Chart

Courtesy of MERCEDES-BENZ USA

Function requirements for transmission shift delay for the ME-SFI gasoline injection and ignition system (engine electronics) (ME), general points 

• Circuit 87M ON (engine control ON)
• Engine running
• Coolant temperature at start T < 35°C
• Vehicle speed v < 40 km/h

ME-SFI transmission shift delay, general points 

Transmission shift delay brings the firewall catalytic converter more quickly up to operating temperature after engine start. The ME-SFI [ME] control unit controls the transmission shift delay according to the following sensor and signal:

• Coolant temperature sensor
• ESP control unit, vehicle speed via the drive train CAN

ME-SFI transmission shift delay, function sequence 

Transmission shift delay is active for a maximum of t = 60 s and is entirely electronic.

The ME-SFI [ME] control unit asks the electric controller unit (VGS) via the drive train CAN, to adjust the shift characteristics.

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