841175 - DESCRIPTION OF COMPONENTS

ENGINE MANAGEMENT NODE (COMMON RAIL EDC-16C8)

Specifications

This is fitted on the left front side beneath the wheelarch. The Engine Control Node is 'flash e.p.r.o.m.' type, i.e. it can be reprogrammed externally without altering the hardware.The Engine Control Node contains a built-in absolute pressure sensor.Pin outCONNECTOR A

1, Cylinder 3 injector positive
2, Cylinder 2 injector positive
3, Not connected
4, Fuel pressure regulator positive
5, Not connected
6, Not connected
7, Not connected
8, Fuel pressure sensor negative
9, Not connected
10, Not connected
11, Timing sensor positive
12, Engine rpm sensor negative
13, Supercharging sensor positive
14, Not connected
15, Turbo pressure electro-pneumatic management valve positive
16, Cylinder 1 injector positive
17, Cylinder 4 injector positive
18, Cylinder 5 injector positive
19, Not connected
20, Timing sensor negative
21, Not connected
22, Not connected
23, Supercharging pressure and intake air temperature sensor negative
24, Not connected
25, Not connected
26, Not connected
27, Engine rpm sensor positive
28, Fuel pressure sensor positive
29, Flow meter positive
30, Not connected
31, Cylinder 2 injector negative
32, Not connected
33, Cylinder 4 injector negative
34, Fuel pressure regulator negative
35, Insufficient engine oil pressure sensor signal
36, Not connected
37, Air temperature sensor signal on flow meter
38, Not connected
39, Not connected
40, Supercharging sensor signal
41, Engine coolant temperature sensor negative
42 - Flow meter air flow rate signal
43, Fuel pressure sensor signal
44, Flow meter negative
45, Not connected
46, Cylinder 3 injector negative
47, Cylinder 1 injector negative
48, Cylinder 5 injector negative
49, Not connected
50, Timing sensor signal
51, Not connected
52, Not connected
53, Intake air temperature sensor signal
54, Not connected
55, Not connected
56, Not connected
57, Not connected
58, Engine coolant temperature sensor signal
59, Switching off throttle solenoid valve control actuator negative
60, EGR solenoid valve negative

CONNECTOR K

1, Supply from main relay
2, Control unit earth
3, Not connected
4, Control unit earth
5, Main relay supply
6, Control unit earth
7, Not connected
8, Accelerator pedal potentiometer track 2 negative
9, Accelerator pedal potentiometer track 1 signal
10, Fuel temperature signal negative
11, Fuel temperature sensor signal
12, Air conditioning linear pressure sensor negative
13, Air conditioning linear pressure sensor signal
14, Not connected
15, Not connected
16, Not connected
17, Brake pedal normally open switch signal
18, Not connected
19, Not connected
20, Not connected
21, Not connected
22, Air conditioning linear pressure sensor positive
23, Not connected
24, Not connected
25, Body computer K line
26, Not connected
27, Not connected
28, Key ON signal
29, Air conditioning compressor relay
30, Accelerator pedal potentiometer track 1 negative
31, Accelerator pedal potentiometer track 2 signal
32, Not connected
33, Not connected
34, Not connected
35, Not connected
36, Not connected
37, Not connected
38, Resume Cruise Control
39, Not connected
40, Not connected
41, Not connected
42, Not connected
43, Not connected
44, Not connected
45, Accelerator pedal potentiometer track 1 positive
46, Accelerator pedal potentiometer track 2 positive
47, Body computer W line
48, Engine rpm output signal to robotized gearbox
49, Not connected
50, Not connected
51, Not connected
52, Feedback signal from heater plugs control unit
53, Not connected
54, Climate control engagement request from control button
55, Not connected
56, Cruise Control positive
57, Not connected
58, Not connected
59, Not connected
60, Not connected
61, C-CAN low from ABS control unit
62, C-CAN high from ABS control unit
63, Not connected
64, Not connected
65, Not connected
66, Not connected
67, Not connected
68, Fuel filter heater relay feed
69, Engine cooling fan 2nd speed engagement relay feed
70, Not connected
71, MIL warning light
72, Main relay activation
73, Not connected
74, Water in fuel filter signal
75, Not connected
76, Not connected
77, On/Off cruise control
78, Cruise Control speed decrease signal
79, Clutch switch signal
80, Brake pedal switch 2nd signal (for versions with Cruise Control only)
81, Not connected
82, Not connected
83, C CAN low to Body Computer
84, C CAN high to Body Computer
85, Not connected
86, Not connected
87, Not connected
88, Not connected
89, Not connected
90, Engine cooling fan 1st speed engagement relay feed
91, Fuel pump relay feed
92, Not connected
93, Heater plugs engagement control

RPM SENSOR

Specifications

Type

This is fitted on the crankcase and faces the phonic wheel postioned on the crankshaft.It is inductive type, i.e. its operation is determined by magnetic field changes generated by the teeth passing in front of the phonic wheel (60-2 teeth).The Engine Control Node uses the rpm sensor signal to:

determine speed of rotation
determine angular crankshaft position.

Operation

General remarks

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 directed to the Engine Control Node supplies the node with an engine angular speed measurement.

The recommended distance (gap) between the end of the sensor and the flywheel for obtaining correct signals should be 0.8 - 1.5 mmThis distance is not adjustable. If the gap is found to be outside the tolerance limits, check the condition of the sensor and phonic wheel.

CAM ANGLE SENSOR

Specifications

Type

This Hall effect sensor is fitted to the cylinder head and faces the camshaft drive pulley.A tooth on the pulley allows the timing sensor to indicate engine timing position.The Engine Control Node uses the timing sensor signal to identify T.D.C. at the end of compression.

Operation

General remarks

If current intensity 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 with frequency proportional to the speed of magnetic field change.This change is achieved by making a magnetic ring (internal part of pulley) with an opening pass the sensor.

EXCESS PRESSURE SENSOR

Specifications

The excess pressure and intake air temperature sensor is an integral component which is designed to measure the pressure and the temperature of the air inside the intake manifold.It is fitted on the intake manifold and has the task of informing the injection control unit in order to:

regulate the pressure of the variable geometry turbine in order to ensure optimum engine performance in all operating conditions.
regulate fuel injection duration.

ENGINE COOLANT TEMPERATURE SENSOR

Specifications

Type

This is fitted to the thermostat cup and detects coolant temperature by means of a dual NTC thermistor with negative resistance coefficient.the NTC thermistor sends a signal to the Engine Control Node, which sends a signal to the injector and instrument panel warning light.

The sensor is designed using semiconductor technology. In other words, the resistance level drops if sensor element temperature increases with increasing coolant temperature.Because the resistance does not change in linear fashion as temperature increases, it is relatively higher at low temperatures than at high temperatures.

AIR FLOW METER WITH BUILT IN AIR TEMPERATURE SENSOR

Specifications

Type

The debimeter is located on the air intake sleeve and is hot film type.

The intake air temperature sensor is built into the debimeter.

The air flow meter cannot be disassembled.

Operation

The principle of operation is based on a heated membrane positioned within a measurement channel that carries air into the engine.The hot film membrane is maintained at 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. Current must therefore flow through the coil to maintain the membrane at a constant temperature.This current is measured by a special Wheatstone bridge.The current is therefore proportional to the flowing air mass.

The flow meter measures the air mass directly (not the volume) to eliminate problems of temperature, altitude, pressure etc.

FUEL TEMPERATURE SENSOR

Specifications

It is incorporated in the fuel heater assembly and measures the temperature of the fuel by means of a dual NTC thermistor with negative resistance coefficient.

The sensor is designed using semiconductor technology. In other words, the resistance level drops if sensor element temperature increases with increasing fuel emperature.Because the resistance does not change in linear fashion as temperature increases, it is relatively higher at low temperatures than at high temperatures.

FUEL PRESSURE SENSOR

Specifications

It is fitted at the end of the of the single fuel manifold rail and its function is to provide the injection control unit with a feedback signal to enable it to:

modulate injection pressure;
regulate fuel injection duration.

ACCELERATOR PEDAL POTENTIOMETER

Specifications

Type

The accelerator pedal is equipped with two built-in potentiometers:

a main potentiometer
a safety potentiometer.

The Engine Control Node implements the following recovery strategies.

if one of the two potentiometers fails, this allows the throttle to be opened to a maximum of 40° over a long time period;
if both potentiometers fail completely, it prevents throttle opening.

Operation

General remarks

The sensor consists of a case secured to the pedal unit by bolts. The case contains an axially-located shaft connected to two potetiometers.A coil spring on the shaft ensures the correct amount of resistance to pressure while a second spring ensures return following release.Operating field from 0° to 70°; mechanical stop at 88°.

if one or both potentiometers fail, the whole accelerator pedal must be replaced becaus

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