2009 LAMBORGHINI MURCIÉLAGO Service Repair Manual

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The catalytic converter is a device that simultaneously reduces the three main pollution components in the exhaust: Unburnt hydrocarbons (HC), carbonmonoxide (CO) and nitrogen oxides (NOx). Inside the catalytic converter two chemical reactions take place: •Oxidizing of the CO and HC, converted into carbon dioxide (CO2) and water (H2O);
• Reduction of the NOx converted into nitrogen (N2).
These reactions are possible in a very short time due to the presence inside the structure (metal block) of the
catalyst, of a layer of active substances (platinum and rhodium) that considerably speed up the conversion of the harmful substances.
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Moreover the conversion processes take place with temperatures over 300 to 350°C: Therefore it is essential that
the catalytic converter reaches this temperature as soon as possible so as to operate correctly.
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A. Metal block
B. Metal support
C External steel wrapping

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The causes of destruction of the catalyst inner part are mainly two: •Lead in the fuel, that lowers the conversion level to practically nothing (“lead poisoning”) and irreparably
damages the lambda sensor too;
•  &RPSOHWHO\XQEXUQWIXHOLQWKHH[KDXVWJDVGXHWRPLV¿ULQJ7KLVFDXVHVDQLQFUHDVHLQWHPSHUDWXUHVXFKDV
to cause the melting of the metal support. As a consequence the connector must never, in any circumstances, be disconnected from the coils when the engine is running.

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The exhaust pipe coming out from the catalytic converter features a thermocouple to read the temperature. This
thermocouple generates a signal in proportion to the exhaust gas temperature and sends it to a special electronic
control unit that switches on the “CATALYST RIGHT” or “CATALYST LEFT” warning light to which it is connected.
If there is an abnormal temperature increase in one of the catalytic converters the control unit intervenes as follows:•For temperatures ranging between 945 and 960 °C the “CATALYST” warning light switches on intermittently:
,QWKLVFDVHLWLVQHFHVVDU\WRVORZGRZQWKHFDUXQWLOWKHZDUQLQJOLJKWVZLWFKHVRIIWKHQ¿QGWKHFDXVHRIWKHexhaust system overheating.
• For temperatures over 960 °C the “CATALYST” warning light stays on permanently and the fuel is cut off to
WKHLQMHFWRUVRIWKHUHOHYDQWF\OLQGHUEDQN,QWKLVFDVHLWLVQHFHVVDU\WRVWRSWKHFDUDQG¿QGWKHFDXVHRIWKHexhaust system overheating.
When temperature drops below 800°C, normal functions are reset.
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Engine speed
< 4000 > 4000 < 4000 > 4000
Engine Temperature
t 60°
t  60°
t  60°
t  60°
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close close close
open
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energized energized energized
not energized
The values stated may vary
throttle position
< 40% < 40% > 40% > 40%
(1&6system strategy
Engine speed
< 4600 > 4600 < 4600 > 4600
Engine Temperature
t ! 60°
t ! 60°
t ! 60°
t ! 60°
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close close close
open
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energized energized energized
not energized
The values stated may vary
throttle position
< 40% < 40% > 40% > 40%

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Secondary air supply system strategy When the car is turned, if the following conditions occur: •Water temperature between -11°C and +40°C;
• Air temperature <40°C;
• Catalytic converter temperature <250°C;
the pump is controlled: its maximum time is 65 sec.
The pump will stop if any one of these conditions occurs.
To deactivate the system (and disable the pump), one of the following conditions must occur: • Catalytic converter temperature >680°C;
• Air temperature >40°C;
• H2o temperature >40°C;
• Any condition related to the temperature but with a PA1024 >99%.
This system is used when the car started with a cold engine, to increase combustion and allow the catalytic converter
to reach its operating range quickly, reducing emissions.
Secondary air assembly )LJ
A.Auxiliary air valves
B. Pump

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7KLVVHFWLRQH[SODLQVKRZWRGLVDVVHPEOH A) Silencer safety grid %6LOHQFHUJXDUGC) Silencer'([KDXVWWHUPLQDOV(ZD\SLSHV)([KDXVWPDQLIROGV
G)Secondary air assembly

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1.
Unscrew the 4 upper screws ( $)LJ) and the 4 lower screws ( %)LJ) securing the silencer safety grid to
the car.
2. Remove the silencer safety grid.

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Remove the silencer safety grid 3RLQW$.
• Remove the spoiler above the silencer (082703).
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1. Unscrew the 2 screws ( $)LJ) on the guard above the silencer.
2. Unscrew the 4 screws ( %)LJ) securing the 2 side brackets ( &)LJ) on the guard (2 screws for each
bracket).
3. Remove the silencer guard ( ')LJ).