In this version the engine is already equipped for LPG operation: valve and valve seat setup, special intake manifold, special LPG injectors, wiring built in the car's wiring.

The petrol supply system is managed by a control unit that also controls both LPG ignition and injection.

Another control unit manages the LPG and petrol injectors.

The switching logic for the LPG/petrol fuel system takes place through the special switching button in the dashboard.

The LPG system is BUILT INTO the petrol system and does not affect its functionality in any operating condition.

The two control units manage the timed, sequential petrol or LPG injection and the activation of the LPG cut out solenoid valves as well as the LPG supply valve and the deactivation of the petrol pump during switching to LPG.

For more details,

  See descriptions 1057 GPL INJECTION SYSTEM 

In addition to the dedicated control unit, the LPG system is controlled by two relay switches in the engine compartment junction unit; the control unit supply line is protected by a dedicated fuse also located in the engine compartment junction unit; a dedicated fuse outside the control unit protects the supply line of the LPG control unit.

The M10 Powertrain Control Module controls and regulates the entire ignition and electronic injection system.

The ignition-operated power supply arrives via a line protected by fuse F16 of the engine compartment junction unit B1 at pin 49 of connector A of M10.

Pins 50, 53 and 54 of connector A of M10 are earthed.

The main injection relay switch T09 of B1 controls the entire system: it is energised by a control signal (earth) from pin 30 of connector A of control unit M10 and then sends power supply:

- to pins 46, 55 and 56 of connector A of the control unit itself, through the line protected by fuse F17 of B1;

- to fuel vapour recovery solenoid valves L10, wastegate L37 and turbocharger by-pass L102, as well as oxygen sensors K15 and K17 (all these lines are protected by fuse F11 of B1);

- to coils A30 and injectors N70 via a line protected by fuse F22 of B1.

The fuel pump relay switch T17 of B1 is energised by a control signal from pin 40 of connector A of control unit M10 and provides a power supply, through the line for fuse F21 of B1, for the fuel pump N40.

Powertrain Control Module M10 receives signals from the various different sensors, in this way it keeps all the engine operating parameters under control.

The rpm sensor K46 provides information about the engine speed, via a frequency signal sent to pins 1 and 13 of connector B of the control unit M10.

The timing sensor K47 is supplied by pin 8 of connector B of control unit M10; it receives a reference earth from pin 6 of connector B, and sends a frequency signal corresponding to the timing to pin 36 of connector B of the control unit.

The air temperature/pressure sensor K44 receives a reference earth from pin 27 of connector B; it sends a signal corresponding to intake air temperature to pin 18 of the control unit. Pin 28 of connector B of M010 sends a power supply to sensor K44, which returns a signal proportional to intake air pressure to pin 12.

Supercharging sensor K82 receives a reference earth from pin 23 of connector B and a power supply from pin 28 of connector B of M10 and returns a signal proportional to supercharging pressure to pin 2.

Engine temperature sender unit K36 receives a reference earth from pin 19 of connector B of control unit M10 and provides a signal proportional to the temperature of the engine coolant at pin 7 of connector B of the control unit.

The oxygen sensor on pre-catalytic converter K15 and the one on catalytic converter K17 provide control unit M10 with information concerning the correct composition of the air-fuel mixture

The sensor K15 sends a signal to pin 22 of connector B of the control unit, while pin 4 provides a reference earth: these two signals are very low intensity and are therefore appropriately shielded. Sensor K15 is heated by a coil to ensure correct operation even when cold; the coil is supplied by the main relay switch T9; pin 35 of connector B of M10 provides the reference earth.

The sensor K17 sends a signal to pin 21 of connector B of the control unit, while pin 5 provides a reference earth: these two signals are very low intensity and are therefore appropriately shielded. Sensor K17 is heated by a coil to ensure correct operation even when cold; the coil is supplied by the main relay switch T9; pin 47 of connector B of M10 provides the reference earth.

The knock sensor K50 provides information, by means of frequency signals, concerning the onset of knock in the combustion chamber: it sends two signals to pins 37 and 25 of connector B of M10; these signals are also appropriately shielded.

Accelerator pedal K55 has two built-in potentiometers (a main one and a safety one). The former receives power supply and earth respectively from pins 19 and 37 of connector A of M10 and sends a corresponding signal to pin 24 of the same connector. The latter receives power and earth from pins 25 and 51 of connector A of M10 and sends a corresponding signal to pin 22 of the same connector.

Control unit M10 receives the minimum engine oil pressure sensor K30 signal at pin 32 of connector B.

Pin 48 of connector A of M10 receives a signal from brake light switch I30 - N.O. contact - with an ignition-operated power supply from fuse F37 of Body Computer M1. Through the CAN, it receives a signal - N.C. contact - from brake light switch I30 with an ignition-operated power supply from fuse F51 of Body Computer M1

The clutch sensor I31 receives a 5 V power supply and a reference earth from pins 2 and 52 of connector A of M10, and sends information on the gear to pin 21 of the same. .

Pin 35 of connector A of M10 receives the signal coming from the reversing switch I20.

The control unit M10 directly controls the opening of the - petrol - injectors N70, from pins 46, 50, 39 and 49 of connector B of M10. The injectors N70 receive a power supply to enable the opening of the main relay switch T9 of B1.

The control unit M10 also controls the coils A30 through control signals for the coil's primary winding, while the secondary winding sends an impulse to the glow plugs: from pins 56, 54, 53 and 55 of connector B of M10. The primary windings of coils A30 receive power supply to enable opening of main relay switch T9 of B1.

Throttle body actuator N75 has two built-in potentiometers connected in parallel: this controls the throttle opening by means of a step motor.

The motor receives a power supply from pins 51 and 52 of connector B of M10. Pin 9 of connector B sends the power supply to the two potentiometers, pin 11 provides the earth signal for them, whilst pins 24 and 20 of the same connector receive signals that come from the throttle body actuator N75.

Fuel vapour recovery solenoid L10 allows the flow of fuel vapours to the engine intake, where they are added to the mixture entering the combustion chamber. Valve L10 is supplied from main relay switch T9 of B1; it is opened by the control unit when the engine is under load through a signal from pin 45 of connector B of M10.

The turbo pressure solenoid valve regulates the turbocharger wastegate mechanical valve; solenoid valve L37 is supplied by main relay switch T9 of B1 and is controlled by the control unit via a signal from pin 13 of connector A of M10.

The turbocharger by-pass solenoid L102, connected to the intake pipe near the throttle body, allows the excess pressure to be discharged during the release stage in order to prevent excessive increases in pressure which could damage the inlet pipes and upset the operation of the turbine.

It is supplied by main relay switch T9 of B1 and is controlled by the control unit via a signal from pin 40 of connector B of M10.

The control unit M10 is then connected through the CAN - pins 32 and 44 of connector A - to the Body Computer M1 and to the other network nodes, information on the following is sent through this connection:

- self-diagnosis of the system that also produces a signal for the EOBD warning light, located on the instrument panel E0050 and that is connected to the connector R010;

- engine coolant temperature, which is sent to the instrument panel E050 which manages the gauge and the warning light;

- engine rpm, which is sent to the instrument panel E050 rev counter;

- minimum engine oil pressure, which is sent to the instrument panel E050 that controls the warning light;

It receives the speedometer signal, through the CAN, produced by the ABS control unit M050

The LPG injection control unit M18 processes the information from - via CAN - the basic system sensors, and the information from the additional sensors for LPG operation in order to recognise the system operating conditions and produce suitable commands for the LPG injectors.

The control unit M18 is connected through the CAN - pins 13-24 and 39-50 of connector A - to the Body Computer M1 and to the other network nodes.

Shunt fuse B34 - outside of B1 - protects the ignition-operated power supply line, at pins 1 and 44 of connector A of M18.

The LPG injection relay switch T20 of B1 controls LPG injection: it is energised by a control signal (earth) from pin 26 of connector A of control unit M10 and sends, via the line protected by fuse F84 of B1, a supply to pins 14 and 27 of connector A of M18.

Pins 2, 26 and 28 of connector A of control unit M18 are earthed.

The switching button H94 receives a 5 V supply from control unit M18 from pin 20 of connector A, while pin 9 provides the reference earth; pin 33 on the other hand sends the gas level signal for display.

The switching button located in H94 sends a switching signal to pin 18 of connector A of M010, while pin 28 manages the corresponding switching on of the LED.

The LPG pressure and temperature sensor K215 receives a reference earth from pin 23 of connector B of M10; it sends a signal corresponding to the LPG temperature to pin 3 of the control unit itself. Pin 28 of connector B of M10 sends a supply to sensor K215, which returns a signal proportional to the pressure to pin 15.

LPG level sensor K33 receives power supply and reference earth from Powertrain Control Module M010, pins 1 and 3 of connector A, and sends the level signal to pin 11.

The LPG relay switch T10 of B1 is supplied by the line protected by fuse F15 of B1.

It is energised by a control signal from pin 16 of connector A of control unit M10 and provides the power supply to the LPG cut out solenoid valve L63 and the LPG supply solenoid valve L95.

Control unit M18 controls - in the event of LPG operation - the opening of injectors N73 through special signals sent from pins 72-79, 73-80, 66-59 and 58-65 of connector B.

The petrol injector closing request is sent to the Powertrain Control Module M10 - pins 43, 42, 44 and 41 of connector B - respectively from pins 70, 77, 71 and 78 of connector B of M18.