Gasoline injection and ignition system
Engine M132
35
Introduction of the smart fortwo, Model Series 451
Injection control
Engine M132 features an ME (motor electronics)
gasoline injection and ignition system. The central
control unit of this system is the ME-SFI [ME] control
unit. It is networked over CAN with the following
components:
• Instrument cluster
• SAM control unit
• Automated manual transmission control unit
• Heater/AC operating unit
• ESP control unit
• Steering assist control unit
• Data link connector
The ME-SFI [ME] control unit puts its information on
the CAN, making it accessible to all the other
networked components on the CAN. The information
from other components reaches the ME-SFI [ME]
control unit in the same way. For example, the signal
from the clutch motor, which is read directly by the
automated manual transmission control unit, reaches
the ME-SFI [ME] control unit in this way.
Direct input signals come from:
• Knock sensor
• Fuel tank pressure sensor
• Camshaft Hall sensor
• Coolant temperature sensor
• Accelerator pedal sensor
• O2 sensor downstream of TWC [KAT]
• O2 sensor upstream of TWC [KAT]
• Crankshaft position sensor
• Throttle valve actuator
• Oil pressure switch
Direct output signals go to:
• Fuel pump relay
• Fuel pump with fuel level sensor
• Secondary air injection pump relay
• Secondary air injection pump
• Secondary air injection pump switchover valve
• Throttle valve actuator
• Cylinder 1 ignition coil
• Cylinder 2 ignition coil
• Cylinder 3 ignition coil
• Outside air shutoff valve
• Adjustable camshaft timing solenoid
• Cylinder 1 fuel injection valve
• Cylinder 2 fuel injection valve
• Cylinder 3 fuel injection valve
• Fuel tank vent valve
There are also the following inputs on the ME-SFI [ME]
control unit:
• Circuit 15
• Circuit 30
• Circuit 31
Function
The engine is controlled according to load by the
performance map based on the signals arriving either
directly or over CAN. The actuators are actuated via
direct lines in accordance with the values computed
by the ME-SFI [ME] control unit. Information intended
for other components is put on the CAN.
The ME-SFI [ME] control unit has an integral fault
memory and can exchange information with STAR
DIAGNOSIS via a data link connector that is connected
to the CAN.
SN_Typ 451_us.book Seite 35 Freitag, 30. November 2007 1:56 13
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