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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 49 and 50 of connector B of M10. Pin 10 of connector B sends power to both potentiometers, while pin 13 sends an earth signal to the potentiometers; pins 42 and 22 of the same connector receive signals that reach 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 loaded via a signal from pin 3 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 through a signal from pin 19 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 5 of connector B of M10.
The control unit M10 is connected through the CAN - pins 88 and 89 of connector A - to the Body Computer M1 and to the other network nodes; through this connection it sends information on the following
- 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
Lpg injection
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.
The main injection relay switch T9 of B1 also controls the LPG control unit and consequently sends a supply to pins 1 and 44 of connector A of M18, through the line protected by fuse F11 of B1.
The LPG injection relay switch T20 of B1 controls LPG injection: it is energised by a control signal (earth) from pin 73 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 62 of connector A of M010, while pin 71 manages the corresponding switching on of the LED.
The LPG pressure and temperature sensor K215 receives a reference earth from pin 14 of connector B of M10; it sends a signal corresponding to the LPG temperature to pin 32 of the control unit itself. Pin 9 of connector B of M10 sends a supply to sensor K215, which returns a signal proportional to the pressure to pin 58.
The LPG level sensor K33 is connected to pin 80 and 7 - connector A - of control unit M18 (reference earth).
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 31 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 7, 20, 8 and 6 of connector B - from pins 70, 77, 71 and 78 of connector B of M18.
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