GF07.61-P-4019MLK ME-SFI Overrun Fuel Shutoff, Function

GF07.61-P-4019MLK ME-SFI Overrun Fuel Shutoff, Function
- refinement package
- as of model year 09


Function requirements for deceleration fuel shutoff, general points
^ Circuit 87M ON (engine control ON)
^ Engine running
^ Vehicle rolling
^ Accelerator not operated
^ Selector lever position "D" or "R"
^ Vehicle is not cruise control mode

Deceleration fuel shutoff, general points
Deceleration fuel shutoff in deceleration mode of the engine has the following tasks:
- Increasing the braking effect of the engine
- Reducing fuel consumption
- Improving exhaust characteristics

The ME-SFI (N3/10) control unit performs a deceleration fuel shutoff according to the following sensors and signals:
- Coolant temperature sensor (B11/4)
- Accelerator pedal sensor (B37), accelerator pedal position
- Crankshaft position sensor (L5), motor speed
- Electric controller unit (VGS) (Y3/8), shift stage over the engine compartment CAN (CAN C)

Deceleration fuel shutoff function sequence
In deceleration mode, the ME-SFI control unit shuts off the fuel injection valves (Y62) depending on coolant temperature, engaged gear and engine speed, if the accelerator pedal is not operated. The fuel injection valves are switched on again when the accelerator pedal is operated.
After deceleration fuel shutoff, the fuel-air mixture is briefly enriched by lengthening the injection time, in order to clear enriched oxygen from the catalytic converters.