Determination Of The Fuel Temperature, Function - Mercedes-Benz OM 471 Introduction Into Service Manual

GF07.04>W>3001H
ENGINE 471.9 in MODEL 963
Shown code (M5Z) Engine version Euro VI
A4 Engine management control unit (MCM)
B602 Fuel temperature sensor
CAN 4 Drive train CAN
General
The properties of the fuel (volume, viscosity) change significantly
with increases or decreases in temperature so it is essential to
determine the fuel temperature, particularly for calculating the
injection period.
Component description for engine
management (MCM) control unit
Component description for fuel
temperature sensor
i Introduction of engine OM 471 and exhaust aftertreatment > 09/2011 >

Determination of the fuel temperature, function

– This printout will not be recorded by the update service. Status: 09 / 2011 –
Function
The fuel temperature is determined by the engine management
(MCM) control unit (A4) using measurement values provided by
the fuel temperature sensor (B602).
There is a temperature>dependent resistance with a negative
temperature coefficient (NTC) in the fuel temperature sensor
(B602), an electrical resistance which reduces as the temperature
increases. The voltage applied to the engine management (MCM)
control unit (A4) changes according to the temperature of the
fuel; the level of this voltage is what determines the fuel
temperature.
i If the fuel temperature sensor (B602) malfunctions, the engine
management continues to operate with substitute values.
A4
B602
Functions
2.8.11
W07.16-1063-81
Page 103
Page 147
57