3232879 - 1060G pressure pump electric control
VIEW OF ASSEMBLY
1, Auxiliary electric fuel pump
2, Heater plugs control unit
3, Speedometer
4, Rev counter
5, Heater plugs waring light
6, Engine Check warning light
7, E.G.R. modulating valve
8, Pressure regulator
9, Excess pressure sensor
10, Fuel temperature sensor
11, Fuel pressure sensor
12, Relay
13, Injection control unit
14, Fuel injectors (4 for 1.9 JTD; 5 for 2.4 JTD)
15, Heater plugs (4 for 1.9 JTD; 5 for 2.4 JTD)
16, Rpm sensor
17, Water temperature sensor
18, Climate control connector
19, Diagnostic connector
20, Alfa Romeo CODE connector
21, Flow meter
22, Timing sensor
23, Accelerator pedal potentiometer
24, Clutch pedal switch
25, Brake pedal switch
EDC-15C Common Rail injection control unit
It is fitted in the passenger compartment
on the passenger side panel. The control unit is the 'flash EPROM' type,
i.e. reprogrammable from the outside without intervening on the
hardware.The injection control unit integrates the
absolute pressure sensor.PINS
RPM sensor
It is fitted on the engine block, where
it faces the phonic wheel located on the crankshaft.It is of the inductive type, i.e. it functions
by means of the variation in the magnetic field generated by the passage
of the teeth of the phonic wheel (60-2 teeth).The fuel injection control unit uses
the rpm sensor to:
- determine the speed of rotation
- determine the angle of the crankshaft.
Operation
The passage from full to empty, due to the
presence or absence of the tooth, causes a variation in the magnetic flow
which is sufficient to generate an induced alternating voltage,
resulting from the count of teeth located on a ring (or phonic wheel).The frequency and range of the voltage sent
to the electronic control unit provides it with the angular speed of
the crankshaft.
1, Brass bush
2, Permanent magnet
3, Plastic sensor casing
4, Coil winding
5, Polar core
6, Toothed or phonic wheel
7, Coaxial two-wire cable or electrical connection
The specified gap for obtaining correct
signals, between the end of the sensor and the phonic wheel, must be
between 0.8 and 1.5 mm.This gap is not adjustable, so if a value
outside the tolerance range is measured, check the condition of
the sensor and the phonic wheel.
1, Maximum magnetic flow
2, Minimum magnetic flow
3, Trend of induced alternating voltage
For operating checks, see test
See Test 1056B Check altitude corrector efficiency
.
Timing sensor.
Hall effect; it is mounted on the cylinder
head and 'facing' the exhaust camshaft pulley.This pulley comprises a gap which enables
the timing sensor to indicate the engine's timing position.The fuel injection control unit uses the
timing sensor's signal to find out the TDC at the end of compression.Operation
A semiconducting layer, through which current
passes, immersed in a perpendicular magnetic field (force lines perpendicular
to the current direction), generates at its ends a difference in
potential known as Hall voltage.If the intensity of the current remains
constant, the voltage generated only depends on the intensity of
the magnetic field; the intensity of the field simply has to vary
periodically to produce a modulated electrical signal, whose frequency
is proportional to the speed with which it changes magnetic field.To obtain this change, a metal ring (the
inside of the pulley) with a gap passes through the sensor.As it moves, the metal part of the ring
covers the sensor, blocking the magnetic field, resulting in a low
output signal; viceversa, level with the gap and so when the magnetic
field is present, the sensor generate a high signal.This signal, together with the rpm and TDC
signal, allows the control unit to recognize the cylinders and determine
the injection point.
1, Pulley ring
2, Magnetic material
Pressure relief sensor
It is fitted at the centre of the
inlet chamber and has the task of notifying the injection control
unit to:
- regulating the injection pressure
- regulating the injection duration.
Pins
1, 5 V (from ECU)
2, Earth
3, Output signal
For operating checks, see test
See Test 1060G Excess pressure sensor operation check
.
Coolant temperature sensor
It is fitted on the thermostatic cup and
measures the temperature of the coolant by means of an NTC thermistor which
has a negative resistance coefficient.The sensor is produced using semiconductor
technology, so if the temperature of the sensor increases as the temperature
of the coolant increases, the resistance decreases.As the variation in resistance is not linear,
for the same temperature increment, it is higher for low temperatures than
for high temperatures.
1, NTC resistor
2, Sensor body
3, Supply connector
For operating checks, see test
See Test 1056B Check on operation of engine coolant temperature
sensor
.
Air flow meter
The flow meter is located on the air inlet
duct and is of the 'hot film' type.The intake air temperature sensor is built
into the flow meter.
1, Covers
2, Electronic card
3, Sensor
4, Support plate
5, Support
6, O-ring
7, Temperature sensor
 | The air flow meter cannot be dismantled. |
Operation
The operating principle is based on a heated
diaphragm located in a measuring duct through which the intake air
entering the engine flows.The hot film diaphragm is kept at a constant
temperature (about 120° C above the incoming air temperature) by
the heating resistor.The air mass passing through the measuring
duct tends to draw heat from the diaphragm, so to keep the latter at
a constant temperature, some current must flow through the resistor.This current is measured by a suitable Wheatstone
bridge.The current is therefore proportional to
the mass of flowing air.The flow meter directly measures the
air mass (not volume), thus eliminating problems of temperature,
altitude, pressure, etc.
For operating checks, see test
See Test 1056B Check efficiency of hot film air flow meter
.
Accelerator pedal potentiometer
The accelerator pedal is fitted with
two integrated potentiometers:
- one main potentiometer
- one safety potentiometer
The injection control unit implements
the following 'recovery' strategies
- if there is a fault with one of the two potentiometers,
a butterfly opening of up to 40° is allowed for a long period
- if both of the potentiometers fail completely, the butterfly
opening is excluded.
The accelerator pedal is adjusted by excluding
the end of travel (this position should not be exceeded).Operation
The sensor consists of a casing (1), fixed
to the pedals by a flange, which contains a shaft (2), in an axial position,
connected to the two potentiometers (3).There is a coil spring on the shaft which
guarantees the correct resistance to the pressure whilst a second spring
ensures the return on release.Operating range from 0° to 70°; mechanical
stop at 88°.| ... DATA ERROR - CROPPED TEXT | Ошибка данных - Текст обрезан ... |
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Fuel temperature sensor
It is fitted on the return manifold and
measures the temperature of the fuel by means of an NTC thermistor with
a negative resistance coefficient.For operation, refer to 'Engine coolant
temperature sensor'Fuel pressure sensor
It is fitted in the centre of the
'rail' fuel distribution manifold and has the task of supplying
the injection control unit with a 'feedback' signal for:
- regulating the injection pressure
- regulating the injection duration.
