Mixture Formation (Coupe): Overview Smart Fortwo II

Component description for fuel injection valves - GF07.03-P-6010MCC

ENGINE 132.9 in MODEL 451.3 /4

Scheme 1

Location

The fuel injection valves are located in the cylinder head upstream of the intake valves.

Task

The injection valves inject the fuel in the required amount before the intake valve.

Design

Scheme 2

Function

When the solenoid coil is energized, the nozzle needle is raised about 0.1 mm by the solenoid armature against the force of the coil spring.

Fuel escapes through the outlet hole and is sprayed into the intake port in a finely atomized spray.

Fuel injection valves are actuated by mass impulses from the ME-SFI [ME] control unit (N3/10).

Component description for crankshaft position sensor - GF07.04-P-6010MCC

ENGINE 132.9 in MODEL 451.3 /4

Scheme 3

Location

The crankshaft position sensor is located at the bottom right on the cylinder crankcase.

Task

The crankshaft position sensor detects the crankshaft position and motor speed.

Scheme 4

Function

The front edge of a tooth on the clutch plate generates a positive voltage pulse and the rear edge generates a negative one.

The distance from the positive to the negative voltage peak corresponds to the length of a tooth.

The gap produced by 2 missing teeth results in no voltage being generated in the crankshaft position sensor. This gap is used for detecting the TDC position of cylinder 1.

The distance between the crankshaft position sensor and the teeth of the drive plate is specified by the installation position

Component description for camshaft Hall sensor - GF07.04-P-6020MCC

ENGINE 132.9 in MODEL 451.3 /4

Scheme 5

Location

The camshaft Hall sensor is located on the left on the cylinder head in the area of the intake camshaft.

Task

The camshaft Hall sensor transmits the respective position of the intake camshaft as a square wave signal to the ME-SFI [ME] control unit (N3/10).

Function

Detection of the positions of the camshafts takes place through recognition of the positions of the quadrants mounted on the intake camshaft

Signals are generated according to the camshaft revolution. Here the signals switch between about 5 V (high) and about 0 V (low). If there is a Hall sensor opposite the "cutout in the pulse wheel" the signal is about 5 V.

Signal failure is compensated for by the ME-SFI [ME] control unit by the signal from the crankshaft position sensor (L5). However, a precise calculation of the injection timing point is no longer possible

Component description for the knock sensor - GF07.04-P-6030MCC

ENGINE 132.9 in MODEL 451.3 /4

Scheme 6

Location

The knock sensor is located on the engine crankcase under the exhaust manifold.

Task

The knock detects vibrations which are emitted by the cylinders and transmits these in the form of an electrical signal to the ME-SFI [ME] control unit (N3/10).

In the event of failure of the knock sensor, the ignition performance map for low quality fuels or fuels with a low octane rating is used by the ME control unit

Design

The knock sensor consists of

1. A seismic mass
2. Piezoceramic perforated disc
3. Thrust sleeve
4. Housing

Function

The knock sensor is screwed through the thrust sleeve to the crankcase. The vibrations which are coming from the individual combustion chambers are transmitted by the seismic ground to the piezoceramic perforated disc. The piezoceramic generates an electrical voltage signal and passes this on to the ME-SFI [ME] control unit.

The piezoceramic consists of crystals on whose surface an electrical voltage is generated through deformation

Coolant temperature sensor, component description - GF07.04-P-6040MCC

ENGINE 132.9 in MODEL 451.3 /4

Scheme 7

Location

The coolant temperature sensor is screwed onto the left side on the cylinder head.

Task

The coolant temperature sensor detects the coolant temperature and transmits a corresponding voltage signal to the ME-SFI [ME] control unit (N3/10).

Function

The NTC resistor integrated within the coolant temperature sensor changes its electrical resistance according to the coolant temperature. The ME-SFI [ME] control unit applies a sensor voltage of 5 V to pin 1 (1) and evaluates signal voltage at pin 2 (2) according to the coolant temperature.

Scheme 8

Component description for the intake manifold pressure sensor - GF07.04-P-6062MCC

ENGINE 132.9 in MODEL 451.3 /4

Shown on engine 132.910

Scheme 9

Location

The intake manifold pressure sensor is located on the intake manifold.

Task

The intake manifold pressure sensor detects the pressure and the air temperature in the intake manifold downstream of the throttle valve and passes this information on in the form of voltage signals to the ME-SFI [ME] control unit (N3/10).

Function pressure measurement

The pressure applied to the pressure gauge connection distorts a membrane which acts on a piezoresistor. In this way the piezoresistor changes its resistance value and transmits an appropriate voltage signal to the ME-SFI [ME] control unit.

Function temperature measurement

There is an additional NTC resistor integrated in the intake manifold pressure sensor. This alters its electrical Resistor according to the air temperature in the intake manifold.

The ME control unit applies a sensor voltage and evaluates the air temperature in accordance with the signal voltage.

Component description for O2 sensor - GF07.04-P-6100MCU

ENGINES 132.9 in MODEL 451.3 /4

Scheme 10

Location

The O2 sensor upstream of TWC is located in the exhaust system upstream of the three-way catalytic converter. The O2 sensor downstream of TWC is located in the exhaust system downstream of the three-way catalytic converter.

Task

The O2 sensors detect the residual oxygen content in the exhaust and transmit this as a voltage signal to the ME-SFI [ME] control unit (N3/10).

Body

Installed O2 sensors are voltage planar sensors. The sensor tip consists of a gas-tight ceramic (zirconium dioxide) which is coated on both sides with a porous platinum layer. Both platinum layer are connected together and act as electrodes.

Function

The outer sides of the O2 sensors lie in the exhaust flow while the inner sides aerated with oxygen in the air. For a rich mixture the oxygen concentration in the exhaust drops a lot and generates a sensor voltage of about 0.8 V. The ME-SFI [ME] control unit (N3/10) regulates the fuel quantity until the value jumps back again.

For a lean mixture the process operates in reverse, the voltage drops to about 0.2 V. This process is repeated once a second.

In order to reach the operating temperature of about 300°C as quickly as possible the O2 sensors have an integral heater which is controlled by the ME-SFI [ME] control unit.

Table of contents for function description of motor electronics (ME-SFI) fuel injection and ignition system - GF07.61-P-0999MCU

ENGINES 132.9 in MODEL 451.3 /4

Motor electronics (ME-SFI) fuel injection and ignition system, function GF07.61-P-0001MCU (ME-SFI) motor electronics fuel injection and ignition system, location of components GF07.61-P-0001-01MCU Motor electronics (ME-SFI) fuel injection and ignition system control unit, input signals GF07.61-P-0001-06MCU Motor electronics (ME-SFI) fuel injection and ignition system control unit, output signals GF07.61-P-0001-07MCU Electrical function diagram for engine control ME-SFI [ME] PE07.61-P-2050MCU Wiring diagram, fuel injection and ignition system ME-SFI PE07.61-P-2000MCU Start procedure, function GF07.15-P-2001MCU ME-SFI driving mode, function GF07.61-P-2005MCU On-Board Diagnosis (OBD) ME function GF07.61-P-1001MCC Overview of system components motor electronics (ME-SFI) fuel injection and ignition system GF07.61-P-9997MCU

Component description for the ME-SFI [ME] control unit - GF07.61-P-6000MCU

ENGINE 132.9 in MODEL 451.3 /4

Scheme 11

Location

The ME-SFI [ME] control unit is located in the trunk, behind the right side paneling.

Task

The ME-SFI [ME] control unit controls, monitors and coordinates the entire engine control.

Function

The ME-SFI [ME] control unit is a subscriber on the Control Area Network (data bus/CAN bus) (CAN) and controls the following systems

1. Fuel supply
2. Injection control
3. Secondary air injection
4. Lambda control
5. Ignition system
6. Immobilizer

Communication with the following components takes place via the CAN

1. Instrument cluster (A1)
2. Restraint systems control unit (N2/7)
3. SAM control unit (N10/10)
4. Automated manual transmission control unit (N15/6)
5. Heater/air conditioning operating unit (N23) (for code (I01) Air conditioning Plus)
6. ESP control unit (N47-5)
7. Steering assist control unit (N68) (with code (V26) Power steering, EPS (FFO))

The following components are read in directly by the ME-SFI [ME] control unit

1. Knock sensor (A16)
2. Tank pressure sensor (B4/3)
3. Camshaft Hall sensor (B6/1)
4. Coolant temperature sensor (B11/4)
5. Intake manifold pressure sensor (B28)
6. Accelerator pedal sensor (B37)
7. Alternator (G2)
8. O2 sensor downstream of TWC (G3/1)
9. O2 sensor upstream of TWC (G3/2)
10. Crankshaft position sensor (L5)
11. Throttle valve actuator (M16/6)
12. Oil pressure switch (S41/1)
13. Fuel level sensor (M3/3b1)

The following components are actuated directly by the ME-SFI [ME] control unit

1. Generator
2. Heating O2 sensor downstream of TWC
3. Heating O2 sensor upstream of TWC
4. Secondary air injection pump relay (K64)
5. Throttle valve actuator
6. Cylinder 1 ignition coil (T1/1)
7. Cylinder 2 ignition coil (T1/2)
8. Cylinder 3 ignition coil (T1/3)
9. Secondary air injection pump switchover valve (Y32)
10. Adjustable camshaft timing solenoid (Y49)
11. External air shut-off valve (Y50)
12. Tank vent valve (Y58)
13. Cylinder 1 fuel injection valve (Y62/1)
14. Cylinder 2 fuel injection valve (Y62/2)
15. Cylinder 3 fuel injection valve (Y62/3)

Overview of system components motor electronics (ME-SFI) fuel injection and ignition system - GF07.61-P-9997MCU

ENGINES 132.9 in MODEL 451.3 /4

Overview of wiring diagrams for mixture formation - PE07.00-P-1100MCU

ENGINE 132 in MODEL 451