Overrun Mode Fuel Shutoff, Basic Function - GF07.10-S-1049A

Engine All (Light transporter)

Overview

This document contains information on:

General
Function requirements
Function

General

In order to reduce fuel consumption, increase the braking effect of the combustion engine and improve the exhaust characteristics, the overrun mode fuel shutoff interrupts the fuel supply to the combustion engine under certain driving conditions. The combustion produces no further output so that the vehicle is only rolling.

Function requirements

Engine management ON (circuit 87M)
Engine in operation
Accelerator not operated
Transmission position "D" or "R" engaged (automatic or dual-clutch transmission)
Transmission position "N" (when the vehicle is at a standstill or rolling)
Speed control or distance control not active
Not too high an exhaust temperatures

Function

If the accelerator pedal is not operated, the overrun mode fuel shutoff automatically comes into operation.

The combustion engine control unit no longer actuates the fuel injectors, depending on the input signals of the coolant temperature, transmission position and engine speed. With a diesel engine, the combustion engine control unit reduces the fuel quantity and accordingly the fuel pressure in the fuel distributor, also via the quantity control valve.

When the accelerator pedal is operated, the combustion engine control unit actuates the fuel injectors again. With a diesel engine, the combustion engine control unit also increases the fuel quantity and the fuel pressure in the fuel distributor via the quantity control valve.

Function schematics
Function schematic for overrun mode fuel shutoff	Engine 654 in model 447.8 with code MO6 (Emissions class Euro 6d M/N1 Gr. II) with code MT6 (Emissions class Euro 6d N1 Gr.III/N2) with code XM0 (Facelift)	PE07.10-S-2508TRA
	Engine 654 in model 447.6/7 with code MO6 (Emissions class Euro 6d M/N1 Gr. II) with code MT6 (Emissions class Euro 6d N1 Gr.III/N2) with code XM0 (Facelift)	PE07.10-S-2508TRB
	Engine 654 in model 447.6/7 with code XM0 (Facelift) except code MO6 (Emissions class Euro 6d M/N1 Gr. II) except code MT6 (Emissions class Euro 6d N1 Gr.III/N2)	PE07.10-S-2508TRK
	Engine 654 in model 447.8 with code XM0 (Facelift) except code MO6 (Emissions class Euro 6d M/N1 Gr. II) except code MT6 (Emissions class Euro 6d N1 Gr.III/N2)	PE07.10-S-2508TRL
	Engine 200 in model 420	PE07.10-S-2508VRA
	Engine 608 in model 420	PE07.10-S-2508VRB
Control units
Combustion engine control unit, basic function		GF07.08-S-9890A