WIRING DIAGRAM - DIESEL ENGINES ELECTRONIC MANAGEMENT - Fiat 500 1.3 Multijet
COMPONENTS - DIESEL ENGINES ELECTRONIC MANAGEMENT - Fiat 500 1.3 Multijet
| Component code | Description | Reference to the operation |
| A001 | BATTERY | |
| A040 | HEATER PLUGS | |
| B001 | JUNCTION UNIT | |
| C010 | LEFT FRONT EARTH | - |
| C015 | DASHBOARD EARTH, DRIVER'S SIDE | - |
| C030 | LEFT REAR EARTH | - |
| C060 | INJECTION CONTROL UNIT EARTH | - |
| D004 | FRONT/ENGINE COUPLING | - |
| D006 | FRONT/REAR COUPLING | - |
| E050 | INSTRUMENT PANEL | |
| H001 | IGNITION SWITCH | |
| I020 | REVERSING LIGHTS SWITCH | |
| I030 | BRAKE PEDAL SWITCH | |
| I031 | CLUTCH PEDAL SWITCH | |
| K030 | ENGINE OIL PRESSURE SENSOR (SWITCH) | |
| K036 | ENGINE COOLANT TEMPERATURE SENSOR/SENDER UNIT | |
| K040 | LAMBDA SENSOR | |
| K041 | AIR FLOW METER | |
| K046 | RPM SENSOR | |
| K047 | TIMING SENSOR | |
| K055 | ACCELERATOR PEDAL POTENTIOMETER | |
| K082 | SUPERCHARGING SENSOR | |
| K083 | FUEL PRESSURE SENSOR | |
| K101 | FUEL TEMPERATURE AND WATER IN FUEL FILTER SENSOR | |
| L030 | EGR SOLENOID VALVE | |
| M001 | BODY COMPUTER | |
| M010 | ENGINE MANAGEMENT ECU | |
| M015 | PLUG PREHEATING CONTROL UNIT | |
| N040 | FUEL PUMP AND LEVEL GAUGE | |
| N070 | INJECTOR | |
| N077 | FUEL PRESSURE REGULATOR | |
COMPONENT LOCATION - DIESEL ENGINES ELECTRONIC MANAGEMENT - Fiat 500 1.3 Multijet
| Component code | Description | Reference to the operation |
| A001 | BATTERY | |
| A040 | HEATER PLUGS | |
| B001 | JUNCTION UNIT | |
| C010 | LEFT FRONT EARTH | - |
| C015 | DASHBOARD EARTH, DRIVER'S SIDE | - |
| C030 | LEFT REAR EARTH | - |
| C060 | INJECTION CONTROL UNIT EARTH | - |
| D004 | FRONT/ENGINE COUPLING | - |
| D006 | FRONT/REAR COUPLING | - |
| E050 | INSTRUMENT PANEL | |
| H001 | IGNITION SWITCH | |
| I020 | REVERSING LIGHTS SWITCH | |
| I030 | BRAKE PEDAL SWITCH | |
| I031 | CLUTCH PEDAL SWITCH | |
| K030 | ENGINE OIL PRESSURE SENSOR (SWITCH) | |
| K036 | ENGINE COOLANT TEMPERATURE SENSOR/SENDER UNIT | |
| K040 | LAMBDA SENSOR | |
| K041 | AIR FLOW METER | |
| K046 | RPM SENSOR | |
| K047 | TIMING SENSOR | |
| K055 | ACCELERATOR PEDAL POTENTIOMETER | |
| K082 | SUPERCHARGING SENSOR | |
| K083 | FUEL PRESSURE SENSOR | |
| K101 | FUEL TEMPERATURE AND WATER IN FUEL FILTER SENSOR | |
| L030 | EGR SOLENOID VALVE | |
| M001 | BODY COMPUTER | |
| M010 | ENGINE MANAGEMENT ECU | |
| M015 | PLUG PREHEATING CONTROL UNIT | |
| N040 | FUEL PUMP AND LEVEL GAUGE | |
| N070 | INJECTOR | |
| N077 | FUEL PRESSURE REGULATOR | |
DESCRIPTION - DIESEL ENGINES ELECTRONIC MANAGEMENT - Fiat 500 1.3 Multijet
An electronic control system supervises and governs all engine parameters to optimise performance and fuel consumption by means of a real-time response to different operation conditions.Diesel engines are equipped with a COMMON RAIL type injection system.This features the use of an electronically controlled high injection pressure. The supply of fuel, known as the pilot injection, is optimized by the electronic control unit by means of the injector, rather than being managed by the pump.In this 4 valve per cylinder version, the common rail injection system uses Multijet technology: during each engine cycle, in addition to the two normal injections, it carries out two pre-injections (before the piston is at top dead centre), one main one and two post-injections.This solution improves fuel consumption, noise levels and performance because it allows better control of temperature in the combustion chamber by lowering the maximum value and extending the optimum combustion area.Depending on the signals received from numerous sensors, the control unit controls the injectors connected to it, managing the following systems:fuel supply;air supply;glow plugs;accelerator pedal;engine cooling;emission control (Lambda sensor).
To respect the latest emissions control regulation (EURO 4), the most recent electronic on-board management version is used, comprising new components (injectors, pressure regulator and high pressure pump, digital debimeter) and the adoption of a lambda sensor.For further details,The system is also controlled by dedicated relays in the engine compartment junction control unit. Lines supplying the control unit and various system components (sensors and actuators) are protected by dedicated fuses that are also located inside the engine compartment junction unit.
FUNCTIONAL DESCRIPTION - DIESEL ENGINES ELECTRONIC MANAGEMENT - Fiat 500 1.3 Multijet
Engine management control unit M010 controls and governs the entire electronic ignition and injection system.The control unit M010 is supplied directly by the battery at pin 50 of connector A via a line protected by fuse F18 of the engine compartment junction unit B001 (pin 5 of connector B).The ignition-operated power supply (15/54) arrives via a line protected by fuse F16 of the engine compartment junction unit B001(pin 12 of connector B) at pin 23 of connector A of M010 .Pins 1, 2 and 3 of connector A of M010 are connected to the negative battery terminal A001 (connector B). A further injection control unit earth C060 is connected to the actual control unit casing (connector C).The main injection relay T09 of junction unit B001 controls the entire system: the coil, supplied directly by the battery via the protected by fuse F18 of B001, is energized by an earth signal coming from pin 80 of connector A of control unit M010 and sends a power supply:to pin 5 of connector A of the control unit (primary charge power supply) via a line protected by fuse F17 of B001 (pin 61 of connector B);to pins 4 and 6 of connector A of the M010 (injector power supply) via a line protected by fuse F22 of B001 (pin 62 of connector B);to pin 5 of connector B of the same control unit, to the EGR solenoid valve and to the heater plugs control unit M015, via the line protected by fuse F11 of B001 (pin 60 of connector B).
The fuel pump relay T17 for B001 receives a direct battery supply via the line for fuse F21 of the actual junction unit B001.The coil, connected to the left front earth C010 via pin 50 of connector B of B001, is energized through a positive signal coming from pin 85 of connector A of control unit M010 and provides a power supply for the fuel pump N040.There is no inertia switch on this vehicle; instead, the fuel cut off function is managed by the air bag control unit which, after having detected an impact, sends the FPS signal (Fire Prevention System) to the network which interrupts the flow of fuel via the engine management control unit M010. This condition is also signalled at the instrument panel E050 via the general failure warning light and a dediacted message in the display.The engine management control unit M010 receives signals from the various sensors in order to control all engine service parameters.The engine rpm sensor K046 provides engine rpm information via a frequency signal sent to pins 43 and 59 of connector B of control unit M010.Timing sensor K047 is supplied from pin 25 of connector B of control unit M110; it receives a reference earth from pin 21 of connector B, and sends a frequency signal corresponding to the phase to pin 56 of connector B of the control unit.Engine coolant sensor/sender unit K036 receives a reference earth from pin 29 of connector B of control unit M010 and sends a signal proportional to engine coolant temperature to pin 54 of the control unit.The air flow meter K041, which receives an ignition-controlled supply (15/54) from fuse F87 of junction unit B001 (pin 14 of connector B), receives a reference earth from pin 27 of connector B of control unit M010 and sends a signal proportional to the air flow rate to pin 14 of connector B.An air temperature sensor inside K041 also sends an air temperature signal to pin 10 of connector B of M010 .Accelerator pedal K055 contains two integral potentiometers (a main one and a safety one). The former receives power and earth signals from pins 83 and 35 of connector A of M010 and sends a corresponding signal to pin 65 of the same connector. The latter receives power and earth signals from pins 15 and 32 of connector A of M010 and sends a corresponding signal to pin 41 of the same connector.The water presence in the diesel filter sensor, integrated in the diesel filter K101 (connector A), receives an ignition-controlled supply (15/54) from fuse F87 of junction unit B001 and is earthed via the negative battery terminal A001 (connector B) and sends the corresponding signal to pin 90 of connector A of control unit M010.The fuel temperature sensor, incorporated in the diesel filter K101 (connector B), detects the temperature of the incoming diesel fuel. It receives a reference earth from pin 61 of connector A of control unit M010 and sends a fuel temperature signal to pin 13.The turbocharging sensor K082 measures the pressure in the intake chamber, downstream of the turbocharger. It is supplied by pin 23 of connector B of control unit M010 and receives a reference earth from pin 24 of connector B. The signal corresponding to the pressure value is sent to pin 41 of connector B of control unit M010.Fuel pressure sensor K083 supplies the injection control unit with a feedback signal to modulate injection pressure and duration. It receives power and a reference earth from pins 8 and 6 of connector B of engine control unit M010 and then sends a pressure signal to pin 38 of connector B.Lambda sensor UEGO K040 - PRESENT ONLY IN THE VERSION WITHOUT A PARTICULATE FILTER - sends signals to pins 44, 46 and 47 of connector A of control unit M010 while pin 45 supplies a reference earth. Sensor K040 is heated by a coil to ensure efficient operation even when cold. The resistance receives an ignition-controlled supply (15/54) from fuse F87 of junction unit B001 and an earth signal from pin 12 of connector A of control unit M010.For further details,The fuel pressure regulator N077, located on the pump, controls the high pressure produced by the actual pump: the two control signals, suitably screened, come from pins 4 and 34 of connector B of control unit M010 .EGR solenoid L030 controls exhaust gas recirculation; it is supplied by a line protected by fuse F11 of B001 and is controlled by a signal from pin 15 connector B of control unit M010.The control unit M010 receives - at pin 9 of connector B - a signal for the minimum engine oil pressure sensor K030.Engine management unit M010 controls the opening of the individual injectors N070, via dedicated signals sent from pins 16-47 (cyl.1), 17-49 (cyl.2), 31-48 (cyl.3), 1-46 (cyl.4) of connector B.The heater plugs control unit M015 receives a power supply, at pin 1 of connector A, directly from the battery via the line protected by fuse F81 of the engine compartment junction unit B001 (pin 24 of connector B) and, at pin 3 of connector B, from the line protected by fuse F11 and operated by the main injection relay T09 both housed in B001. Pin 1 of connector B of M015 is connected to the negative battery terminal A001 (connector B).Control unit M015 exchanges command and control (feeback) signals from pins 2 and 5 of connector B with pins 74 and 70 respectively of connector A of M010 and controls the timed delay.Connector C of M015 is connected to the heater plugs A040.Pin 81 of connector A of control unit M010 receives an NA signal from the switch on brake pedal I030, provided by an ignition-controlled supply (INT) via a line protected by fuse F37 of the Body Computer M001. The latter receives the same signal at pin 27 of connector B.At pin 34 of connector B, the Body Computer M001 receives an NC signal from the switch on brake pedal I030, provided by an ignition-controlled supply (INT) via a line protected by fuse F51 of the Body Computer. The latter forwards this signal to the control unit M010 via the C-CAN.At pin 22 of connector A, the control unit M010 receives the signal coming from the clutch pedal switch I031; it also receives an ignition-controlled supply (INT) from fuse F51 of the Body Computer M001 (pin 25 of connector C).At pin 94 of connector A, the control unit M010 receives the signal coming from the reversing switch I020; the latter receives an ignition-controlled supply (15/54) via the line protected by fuse F87 of junction unit B001.The control unit M010 (pins 40 and 64 of connector A) is connected, via the C-CAN, to the Body Computer M001 (pins 45 and 44 of connector B) and to the other network nodes; information is sent, via this connection, for the management of the indicators and warning lights in the instrument panel E050, in particular for the management of:engine coolant overheating warning light and gauge;rev counter;water in diesel filter sensor;heater plugs warning light;minimum engine oil pressure warning light;EOBD failure warning light;"general failure" warning light valid for the failure of the engine oil pressure sensor or the intervention of the FPS (Fire Prevention System) function.
The control unit M010 receives a speedometer signal generated by the braking system control unit M051 via the C-CAN.It is also connected:from pins 7 and 8 of connector A for managing the engine cooling fan;
from pin 55 of connector B, with the alternator A010 for the management of the insufficient battery recharging/alternator failure (D+) signal;
from pins 10, 37, 79 and 87 of connector A for managing the compressor engagement function.
BATTERY
A001A
A001A
A001B
A001B
A001C
A001D
A001D
A001E
HEATER PLUGS
A040A
A040B
A040C
A040D
JUNCTION UNIT
B001A
B001B
B001B
B001B
B001B
B001B
B001B
B001B
B001B
B001B
LEFT FRONT EARTH
C010
C010
C010
DASHBOARD EARTH, DRIVER'S SIDE
C015
LEFT REAR EARTH
C030A
C030A
C030A
C030B
INJECTION CONTROL UNIT EARTH
C060
C060
FRONT/ENGINE COUPLING
D004
D004
D004
D004
D004
D004
D004
D004
FRONT/REAR COUPLING
D006
D006
D006
D006
D006
D006
D006
D006
D006
D006
D006
INSTRUMENT PANEL
E050
IGNITION SWITCH
H001A
H001A
H001B
REVERSING LIGHTS SWITCH
I020
I020
I020
BRAKE PEDAL SWITCH
I030
I030
I030
CLUTCH PEDAL SWITCH
I031
I031
I031
ENGINE OIL PRESSURE SENSOR (SWITCH)
K030
K030
K030
ENGINE COOLANT TEMPERATURE SENSOR/SENDER UNIT
K036
K036
K036
LAMBDA SENSOR
K040
AIR FLOW METER
K041
RPM SENSOR
K046
K046
K046
TIMING SENSOR
K047
K047
K047
ACCELERATOR PEDAL POTENTIOMETER
K055
K055
K055
K055
SUPERCHARGING SENSOR
K082
FUEL PRESSURE SENSOR
K083
FUEL TEMPERATURE AND WATER IN FUEL FILTER SENSOR
K101A
K101B
EGR SOLENOID VALVE
L030
L030
BODY COMPUTER
M001A
M001B
M001B
M001B
M001B
M001B
M001B
M001B
M001B
M001B
M001B
M001C
M001C
M001C
M001C
M001C
M001C
M001C
M001C
M001C
M001D
M001D
M001E
M001E
M001E
M001F
M001F
M001F
ENGINE MANAGEMENT ECU
M010A
M010A
M010A
M010A
M010A
M010A
M010A
M010A
M010B
M010B
M010B
M010B
M010C
M010C
PLUG PREHEATING CONTROL UNIT
M015A
M015B
M015C
FUEL PUMP AND LEVEL GAUGE
N040
INJECTOR
N070A
N070A
N070A
N070B
N070B
N070B
N070C
N070C
N070C
N070D
N070D
N070D
FUEL PRESSURE REGULATOR
N077
