2000 RENAULT SCENIC Pipe

Downloaded from www.Manualslib.com manuals search engine FUEL MIXTURE
Manifolds
12
12-9
FUEL MIXTURE
Manifolds
REMOVAL
NOTE: Removal of the manifolds requires that you
remove the turbocharger (see section 12
"Turbocharging"). The two manifolds cannot be
removed separately.
Disconnect:
– the battery,
– the air inlet pipe from the intake manifold (2),
– the pipe leading to the pressure sensor on the
manifold (1),
– the EGR (5) solenoid valve.Remove (for the Scénic):
– the windscreen wiper arms,
– the scuttle panel,
– the bulkhead panel,
– the air unit,
– the turbocharger. TIGHTENING TORQUES (in daN.m )
Manifold mounting stud 0.8
Manifold mounting stud 2.8
EGR valve mounting bolt 2.1
16869R2
12415R1

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Manifolds
12
12-10
Remove the EGR solenoid valve pipe and the lifting bracket (4).
16157R

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Priming catalytic converter
12
12-12
Priming catalytic converter
REMOVAL
Put the vehicle on a two post lift.
Disconnect the battery.
Remove the cover and the under body protection.
Disconnect the exhaust downpipe.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.
Remove:
– the priming catalytic converter mounting stay,
– the mounting nuts,
– the pre-catalytic converter. TIGHTENING TORQUES (in daN.m )
Priming catalytic converter mounting nuts
(pre-catalytic converter) 2.4
Lower mounting bolt 2.4
Priming catalytic converter stay bolt 6
16156S
11020R
11036R2

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Priming catalytic converter
12
12-13
REFITTING
Fit the priming catalytic converter (or pre-catalytic
converter) to the turbocharger.
Fit:
– the pre-catalytic converter stay,
– the mounting nuts.
Tighten all the nuts and mounting bolts.
Refit the exhaust downpipe.
Replace the seals.

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Special notes
13
13-4
OPERATION
The common rail direct high pressure injection system is a sequential diesel injection system (based on the
operation of multipoint injection for petrol engines).
This new injection system reduces operating noise, lowers the quantity of polluting gas and particles and produces
significant engine torque at low engine speeds thanks to a pre-injection procedure.
The low pressure pump (also called the supercharging pump) supplies the HP pump, through the filter with pressure
of between 2.5 and 4 bars.
The HP pump generates the high pressure sent to the injection rail. The pressure regulator located on the pump
modulates the value of the high pressure via the computer. The rail supplies each injector through a steel pipe.
The computer:
– determines the value of injection pressure necessary for the engine to operate well and then controls the pressure
regulator. It checks that the pressure value is correct by analysing the value transmitted by the pressure sensor
located on the rail,
– determines the injection time necessary to deliver the right quantity of diesel and the moment when injection should
be started,
– controls each injector electrically and individually after determining these two values.
The injected flow to the engine is determined depending on:
– the duration of injector control,
– the injector opening and closing speed,
– the needle stroke (determined by the type of injector),
– the nominal injector hydraulic flow (determined by the type of injector),
– the high pressure rail pressure controlled by the computer.
FOR ANY INTERVENTION IN THE HIGH PRESSURE INJECTION SYSTEM YOU MUST RESPECT THE
CLEANING AND SAFETY ADVICE SPECIFIED IN THIS DOCUMENT.

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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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Heater plugs
13
13-18
Heater plugs
The resistance of a heater plug is 0.6 Ω.
Plugs may be removed without having to open the
high pressure circuit.
REMOVAL
Unclip the plug connector.
Clean the plug exterior to avoid any dirt entering the
cylinder.
Undo and then remove the plugs.
To undo the plug on cylinder 4 use a 10 mm long radio
socket attached to a universal joint. Once the plug is
loosened use a pipe socket to unscrew it completely.
REFITTING
Proceed in the reverse order to removal.TIGHTENING TORQUES (in daN.m)
Heater plug 1.5
15762S

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Low pressure pump (supercharging pump)
13
13-21
Low pressure pump (supercharging pump)
The supercharging pump is an electric pump located in
the engine compartment.
REMOVAL
IMPORTANT: take note of the quantity of diesel and
the residual pressure in the pipes.IMPORTANT:
A fuel cock (R) is fitted to the fuel filter at the level of
the return pipe leading to the tank.
It should be in open position for normal operation.
To reprime the circuit after an intervention, a filter
change or a fuel fault you should:
– close the fuel cock (R),
– 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. YOU SHOULD FOLLOW THE CLEANNESS
INSTRUCTIONS CLOSELY.
16776S
16870R3