2000 RENAULT SCENIC Air

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Special notes
13
13-5
POST-REPAIR CHECK
A fuel cock is fitted to the fuel filter at the level of the diesel return pipe leading to the tank. It should be in open
position for normal operation.
However, to carry out a circuit reignition after an intervention, a filter change or a fuel fault, you should:
– close the fuel cock,
– start the low pressure pump by switching on the ignition several times,
– start the engine,
– OPEN THE FUEL COCK (the valve is open when the two coloured lines are aligned).
NOTE: certain vehicles are not fitted with a fuel cock. In this case, ignore this operation.
IMPORTANT: the engine must not run with diesel containing more than 10 % diester.
The system can inject the diesel into the engine up to a pressure of 1350 bars. Before any intervention, check
that the injector rail is depressurised.
It is absolutely vital that you observe the tightening torque:
– of the high pressure pipes,
– of the injector on the cylinder head,
– of the pressure regulator,
– of the pressure sensor.
When the high pressure pump, injectors, supply, return and high pressure output unions are repaired or
removed, the bores should be fitted with new and appropriate core seals to avoid impurities.
When replacing a high pressure pipe, the following procedure should be observed:
– remove the high pressure pipe,
– fit the cleanliness plugs,
– loosen the high pressure rail and the pump/rail pipe,
– fit the high pressure pipe,
– tighten the injector side union to torque,
– tighten the connection on the high pressure pump side to torque,
– tighten the high pressure rail fastenings to torque.
– tighten the pump/rail pipe to torque (pump side first).
It is prohibited to remove the interior of the pump.
It is vital that you replace the fuel return pipe placed on the injectors during removal.
The diesel temperature sensor is not removable. It is part of the fuel return rail.
It is forbidden to loosen a high pressure pipe connection when the engine is running.After any operation, check that there are no diesel leaks. Start the engine at idling speed until the fan starts up,
then accelerate several times under no load.

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Cleanliness
13
13-6
Cleanliness
CLEANLINESS INSTRUCTIONS WHICH MUST BE FOLLOWED WHEN WORKING ON THE HIGH PRESSURE
DIRECT INJECTION SYSTEM
Risks relating to contamination
The system is very sensitive to contamination. The risks caused by the introduction of pollution are:
– damage to or destruction of the high pressure injection system,
– seizing of a component or a component which is not sealed.
All after-sales operations must be performed under very good cleanliness conditions. This means that no impurities
(particles a few microns in size) have penetrated into the system during removal or into the circuits via the fuel
unions.
The cleanliness principle must be applied from the filter to the injectors.
WHAT ARE THE POLLUTING ELEMENTS?
The elements which pollute are:
– metal or plastic splinters,
– paint,
– fibres:
!of cardboard,
!of brushes,
!of paper,
!of clothing,
!of cloths.
– foreign bodies such as hair,
– ambient air,
– etc.
WARNING: it is impossible to clean the engine using a high pressure washer at the risk of damaging connections.
Also the moisture may collect in the connectors and cause electrical connection problems.
INSTRUCTIONS TO BE FOLLOWED BEFORE
ANY WORK IS CARRIED OUT ON THE INJECTION SYSTEM
!Ensure that you have plugs for the unions to be opened (bag of plugs sold by the Parts Department).
Plugs are to be used once only. After use, they must be thrown away (once used they are soiled and cleaning is
not sufficient to make them reusable).
Unused plugs must be thrown away.
!Ensure that you have the resealable plastic bags for storing removed parts. There is less risk of parts stored in this
way being subjected to impurities. The bags can be used only once, and once used they must be thrown away.
!Ensure that lint-free cleaning wipes are available (cloths with SODICAM part numbers). The use of conventional
cloth or paper is prohibited. In fact, these create lint and may contaminate the system's fuel circuit. A lint-free
cloth should only be used once.

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Cleanliness
13
13-7
INSTRUCTIONS TO BE FOLLOWED BEFORE OPENING THE FUEL CIRCUIT
!For each operation, use new thinner (used thinner contains impurities). Pour it into a clean receptacle.
!For each operation, use a clean brush which is in good condition (the brush must not shed its bristles).
!Clean using the unions to be opened and the parts to be removed using thinner and tweezers.
!Blow compressed air over the cleaned parts (tools, set up the same way as the parts, connections and injection
system zone). Check that no bristles are left.
!Wash your hands before and during the operation if necessary.
!When using protective gloves, cover leather gloves with latex gloves (available from SODICAM).
INSTRUCTIONS TO BE FOLLOWED DURING THE OPERA
TION
!As soon as the circuit is open, all openings must be blanked to prevent pollution from penetrating the circuit. The
plugs to be used are available from the Parts Department. They must not be reused.
!Reseal the bag hermetically, even if it has to be reopened only a short time later. Ambient air carries pollution.
!All components of the injection system must, after having been blanked, be stored in a hermetically sealed plastic
bag.
!After opening the circuit, the use of a brush, thinner, bellows, sponge or normal cloth is strictly forbidden. In fact,
these elements are liable to cause the entry of impurities into the system.
!When replacing a component with a new one, do not remove it from its packaging until it is to be fitted to the vehicle.

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Location of components
13
13-9
Location of components
1
2
3
4
5
6
7
8
9
10
11
12
13
14Injection computer
Cylinder marking sensor
Solenoid injector
Rail pressure sensor
Flow meter with air temperature sensor
EGR valve
Turbocharger pressure sensor
Preheating unit
Turbocharging pressure regulator (solenoid)
Accelerator pedal potentiometer
Engine speed sensor and coolant temperature sensor
Fuel pressure regulator
Fuel temperature sensor (depending on version)
High pressure pump

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Injection/air conditioning programming
13
13-14
Injection/air conditioning programming
INJECTION COMPUTER/AC COMPUTER CONNECTION
The compressor is of the variable cubic capacity type.
The injection calculator and the air conditioning calculator are linked by two leads:
– The power absorbed information tells the injection computer the output absorbed by the compressor. It is possible
to see the output absorbed using the diagnostic tool. When air conditioning is engaged the reading should be
between 250 and 5000 Watts.
– The connection from the injection computer to the air conditioning computer. This lead carries information on
whether starting the compressor is authorized or forbidden.
When the air conditioning function is selected, idling speed is modified to reach a maximum of 875 rpm.
IMPORTANT: the absorbed output is never equal to 0, whatever the status of the compressor, engaged or not. The
minimum value read is approximately 250 Watts.

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Injection/air conditioning programming
13
13-15
COMPRESSOR OPERATION PROGRAMMING
During certain stages of operation, the diesel injection computer stops the compressor from functioning.
Engine start programming
The compressor is prevented from operating for 5 seconds after the engine has started.
Recovery of performance
When the position of the accelerator pedal is changed significantly and if the engine speed is less than 3000 rpm,
the compressor is prevented from operation for 5 seconds.
Recovery of output when the vehicle starts moving
If the position of the potentiometer is more than 50 % the engine speed is less than 2250 rpm and the vehicle speed
is below 20 km/h, the compressor is cut for 5 seconds.
Anti-stall protection
If the no load position is not detected, and the engine speed is less than 675 rpm. the compressor is disengaged. It
is engaged again after 5 seconds if the engine speed is increased.
Thermal protection programming
The compressor does not engage in cases where the coolant temperature is greater than + 112 °C.

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Thermal plunger
13
13-19
Thermal plunger
The three thermal plungers are located on a water unit
fixed under the manifold at the engine - gearbox joint.
The objective of the system is to reheat the coolant.
The thermal plungers are supplied with 12 volts by
two relays. One relay controls two thermal plungers,
and the other relay controls one thermal plunger. This
enables control of one, two or three thermal plungers
as required.
The resistance of the thermal plungers is:
0.45 ± 0.05 Ω at 20˚C. Control strategy
When the thermal plungers are operating the idling
speed is brought to 900 rpm.
Thermal plungers cannot operate in the case of:
– preheating,
– post heating,
– heated windscreen selected,
– engine speed below 700 rpm.,
If the conditions mentioned above apply, the thermal
plungers are controlled according to a characteristics
map linked to the air and coolant temperature.
Unshaded zone: Thermal plunger not supplied
Shaded zone: Thermal plunger supplied

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Injector rail
13
13-27
Injector rail
IMPORTANT: before any intervention, connect the
after-sales diagnostic tool, query the injection
computer and check that the injection rail is not under
pressure.
Take note of the fuel temperature.SPECIAL TOOLING REQUIRED
Mot. 1294 -01 Tool for removing windscreen
wiper arms
Mot. 1383 Tool for removing high pressure
pipes
ESSENTIAL SPECIAL TOOLING
"Low torque" torque wrench
TIGHTENING TORQUES (in daN.m)
High pressure pipe nut 2.5±0.2
Injection rail mounting bolt 2.2±0.2
REMOVAL
Remove (for the Scénic):
– the windscreen wiper arms using tool Elé. 1294-01,
– the scuttle panel,– the bulkhead panel.
Disconnect the flow meter and remove the air unit.
11020R
11036R2