312000299 - 1060G DIESEL INJECTION PRESSURE PUMP ELECTRONIC CONTROL

Injection control unit (common rail MJD - 6F3 Magneti Marelli)

RPM SENSOR - SPECIFICATIONS

The injection control unit uses the rpm sensor signal to:

• determine the engine rotation speed
• determine the crankshaft angular position.

COMPOSITION - SPECIFICATIONS

TECHNICAL SPECIFICATIONS

The graph shows the sensor output signal in relation to the horizontal development of the flywheel.

1. Toothed wheel profile2. Rpm sensor signal3. Reference tooth4. TDC detection point

OPERATION

The changeover from full to empty determined by the presence or absence of a gap brings about a magnetic flux change sufficient to generate an induced alternating voltage proportional to the number of teeth on the ring (or phonic wheel).The frequency and amplitude of the voltage sent to the electronic control unit provides it with details of crankshaft angular speed.

TIMING SENSOR - SPECIFICATIONS

This Hall effect sensor is fitted on the camshaft housing facing the camshafts.A tooth on the pulley allows the timing sensor to indicate the engine timing position.The injection control unit uses the timing sensor signal to recognize T.D.C. at the end of the compression and during starting to synchronize the engine management control unit with the engine.The sensor is fitted by the exhaust side camshaft.

OPERATION

A current-carrying semiconductor layer submerged in a normal magnetic field (with force lines at right angles to the direction of the current) generates a potential difference known as a Hall voltage at the terminals of the semiconductor.If the intensity of the current remains constant, the generated voltage depends on magnetic field intensity alone. Periodic changes in magnetic field intensity are sufficient to generate a modulated electrical signal whose frequency is proportional to the speed at which the magnetic field changes. To produce this change, a tooth on the inner part of the pulley periodically moves close to the sensor.

PIN OUT

Pin	Description	Signal type
1	Earth	Earth
2	Timing signal	Frequency output
3	Power supply	12 V input

In the specific case of the timing sensor it receives a 5 Volt power supply from the engine management control unit.All the times the rotor passes in front of the sensor a variation in the actual sensor output voltage is produced through the Hall effect; this variation takes place for the entire duration that the rotor passes in front of the sensor after which the signal returns to the original value (5 V).

SUPERCHARGING PRESSURE SENSOR - SPECIFICATIONS

The supercharging pressure sensor is fitted on the intake manifold and allows intake pressures up to 1.5 bar to be measured (corresponding to 2.5 bar absolute).The sensitive element comprises a piezoresistive element whose signal is amplified by an electronic circuit built into the sensor. The sensor receives a direct 5 V supply from the electronic control unit and provides an output voltage directly proportional to the supercharging pressure.

SPECIFICATIONS

Excess pressure sensor pin out

Pin	Description	Signal type
1	Power supply	5V input
2	Earth	Earth
3	Sensor output	Analogue output

COOLANT TEMPERATURE SENSOR - SPECIFICATIONS

This is fitted to the thermostat cup and detects coolant temperature by means of an NTC thermistor with negative resistance coefficient.

SPECIFICATIONS

Engine coolant temperature sensor specifications

Temperature (°C)	Resistance (Kohm)
- 40	48,80
- 30	27,41
-20	15,97
- 10	9,62
0	5,97
10	3,81
20	2,5
30	1,68
40	1,15
50	0,81
60	0,58
70	0,42
80	0,31
90	0,23
100	0,18
110	0,14
120	0,11
130	0,08

FLOW METER - SPECIFICATIONS

The air flow meter is located on the air intake sleeve and is a hot film type meter.There is an arrow on the outer casing showing the direction of the air flow.

Air flow meter pin out

Pin	Description	Signal type
1	Power supply	12V power supply
2	Earth	Earth
3	Temperature sensor	Analogue output
4	Air flow sensor	Analogue output

The air flow meter cannot be disassembled.

OPERATION

This component works on the basis of a membrane positioned within a measurement channel that carries air into the engine.The hot film membrane is maintained at a constant temperature (about 120°C higher than the incoming air temperature) by the heating coil.The air mass that flows through the measurement channel tends to remove heat from the membrane. A certain amount of current must therefore flow through the heater coil in order to maintain the membrane at a constant temperature.The main diagram for the flow meter sensitive element is illustrated.

The platinum hot film sensor is a PTC (positive temperature coefficient) type thermal resistance, in other words a resistance whose value increases as the tempera

... DATA ERROR - CROPPED TEXT | Ошибка данных - Текст обрезан ...