2009 LAMBORGHINI MURCIÉLAGO Service Repair Manual

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The aim is to maintain the engine rpm at around the memorised value, depending on the start-up temperature andthe start-up time itself. A throttle value and an ideal advance value are associated with each target rpm (which forms
a set point around which the system works to maintain the pre-established rpm).
• Start-up with cold engine
During the ignition transient with cold engine an offset on throttle bodies opening is managed according to
engine coolant temperature/ignition seconds.
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When starting with a warm engine, a throttle bodies opening offset is applied based on the engine coolant temperature / ignition seconds and engine oil temperature in order to bring the engine to at least 1,000 rpm
and prevent vapor-lock. Following these operations the system goes to idle conditions where the control unit
automatically maintains the target rpm by carrying out the necessary corrections on the advance and air.


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Fuel Manifold
Each cylinder bank is equipped with a fuel manifold that distributes the fuel to the injectors.
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A. Cylinder bank 7-12 fuel manifold
% Cylinder bank 7-12 pressure regulator
C. Injector
' Cylinder bank 1-6 fuel manifold
( Cylinder bank 1-6 pressure regulator
In the throttle body pcodes, the positioning of the body depending on the cylinder bank and its position is
displayed: FrontandRear IURQWLVWKHWKURWWOHERG\RQWKHÀ\ZKHHOVLGHDQGUHDULVWKHWKURWWOHERG\RQWKH
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This is a differential device with a diaphragm, located in the front part of each fuel manifold and set by the manufacturerto a pressure of 4.00 ± 0.05 bars.
The fuel under pressure coming from the pump pushes onto the diaphragm ( C-Fig.3 RI WKH GRZQÀRZ YDOYH  '
Fig.3 ), opposed by the calibrated spring ( %)LJ).
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Furthermore, through the pressure tap ( A-Fig.3), the vacuum in the intake manifold (where the injector shutter is
also located), operating on the regulator diaphragm, proportionally reduces the load from the calibrated spring.
In this way the pressure difference is kept constant between the fuel and the environment in which the injector is located (intake manifold) under all engine operating conditions.
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A. Vacuum signal tap
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C. Diaphragm
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F. Fuel inlet

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Injectors
The task of the injector is to deliver the amount of fuel required for the engine operation: The fuel is injected into theintake duct, immediately upstream of the intake valves.
As the pressure differential is constant between inside and outside the injector (due to the regulator), the quantity of
fuel delivered, with the same electric power depends only on the opening time, established by the control unit.
The injector is the “top-feed” type with the fuel supplied from the rear of the body ( H-Fig.4), where the electric
winding ( ')LJ) is also located, connected to connector ( ()LJ). The needle ( %)LJ), integral with the anchor
( C-Fig.4 ), is thrust against the seal seat by a spring ( I-Fig.4).
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consequence the needle ( %)LJRSHQVWKHLQMHFWRUDQGWKHIXHOÀRZVWKURXJK
When the current ceases, the shutter is called back into position by the spring ( I-Fig.4).
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1. Snug
2. Needle
3. Magnetic anchor
4. Winding
5. Connector
6. Filter
7. Spring thruster
8. Body
9. Return spring

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3UHOLPLQDU\FKHFNV Start the engine and: • Check pipe and clamp condition;
• Check for pipe and regulator leakage;
• Replace any component that presents visible leakage.
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To check the operation of the pressure regulator proceed as follows: • Connect a precision pressure gauge to the shut off tap, inserting it between the injector holder manifold and the
delivery coupling; check that the tap is open;
• Start up the engine and check that pressure p is within the prescribed values:
3.5 < p < 4.2 bar
If the pressure is above 4.2 bar: replace the pressure regulator.
If the pressure is below 3.5 bar: Check the fuel pump delivery pressure: If the delivery pressure is correct replace the pressure regulator (5 bars).
• Check that the pressure inside the system does not fall below 1 bar for at least 1 hour. If there are no visible
leakages, check the regulator and injectors.
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Close the tool tap to cut off the fuel pump delivery. Check that the pressure is above 4.5 bars. If the pressure is lower:• Check the MED valve condition;
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• Check the pump delivery pressure upstream of the MED valve.

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Injection rail disassembly 3UHOLPLQDU\RSHUDWLRQV •
Remove the carbon bulkhead above the manifold (081303).
Injection rail disassembly
1. Unscrew the three screws ( A-Fig.1) that secure the injection rail to the engine.
2. Disconnect the injection rail from the front pipe ( B-Fig.2).
3. Disconnect the pressure regulator’s pipe ( C-Fig.1).
4. Disconnect the regulator’s fuel delivery pipe ( D-Fig.1).
5. Extract the injection rail.
:KHQ IUHHLQJ WKH YDULRXV SLSHV EH YHU\ FDUHIXO RI DQ\ IXHO UHVLGXHV VWLOO LQVLGH WKHP ZKLFK FRXOG spill onto parts that are still hot inside the engine hood.
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Injection system cleaning Safety precautions
To decrease the risk of personal injury and/or injection and ignition system damage, take the following precautions:
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• :UDSDFOHDQFORWKDURXQGWKHSRLQWRIFRQQHFWLRQDQGORZHUWKHUHVLGXDOSUHVVXUHE\FDUHIXOO\ loosening the connection.
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• The engine must always be off when connecting and disconnecting the battery so that the HQJLQHFRQWUROPRGXOHGRHVQRWEHFRPHGDPDJHG/,(
Use the battery disconnect in the engine compartment to disconnect the battery.
 &$87,21 Always turn the engine off before cleaning it.

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Cleaning
The fuel injection system could become damaged due to even slight contamination. During injection/fuel delivery system maintenance, pay attention to the following cleaning rules: •Thoroughly clean each point of connection and the areas near the engine before disconnecting the parts.
• Immediately close open connections and pipes with protection caps.
• Place the removed components on a clean surface and cover them. Use intact cloths.
• Install the clean components: Remove the spare parts immediately before installation. Do not use components
stored without their packaging (for example, in toolboxes, etc.).
• When the system is open: Do not use compressed air. Do not move the vehicle (unless absolutely necessary).
• Separated electrical connectors: Protect them from dirt and humidity. Make sure they are dry before reconnecting
them.