2000 RENAULT SCENIC charging

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Air-air exchanger
12
12-7
Air-air exchanger
REMOVAL
It is necessary to remove the bumper to access the air-
air exchanger.
To do this, remove:
– the two upper side mounting bolts (A) (torx 20) and
the lower side mounting bolt (B) (torx 20) from the
front section of the front wing inner protector,
– the three mounting clips (C),
– the mounting clip (D) and separate the front section
of the right and left wing protector.If the vehicle is fitted with fog lights.
Disconnect:
– the battery,
– the fog light wiring harness connector (E) located in
the front section of the left-hand front wheel arch.
Remove:
– the upper side mounting bolt (F) on the bumper (on
each side),
– the two front engine underbody mounting bolts,
98710R2
99184R
99147R

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Air-air exchanger
12
12-8
– the central mounting bolt (torx 40).
Remove the two side positioning centring fittings on
the bumper in relation to the wing.
Remove:
– the bumper by pulling forwards,– the flexible air inlet and outlet ducts on the
exchanger (1),
– three mounting bolts,
– the air-air exchanger.
REFITTING
Refit the unit proceeding in the reverse order to
removal.
98836-1R1
99301R94965R
10320R

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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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Specifications
13
113
DIESEL EQUIPMENT
Specifications
Vehicle GearboxEngine
Depollution
standard
Type IndexBore
(mm) Stroke
(mm) Cubic
capacity
(cm
3)Compres-
sion ratioCatalytic
converter
XA05 JC5 F9Q 732 80 93 1 870 19/1◊ C103 Euro 2000
ENGINE SPEED (rpm) SMOKE DENSITY
IDLING SPEED Max. - no loadMax. - under
loadHomologation value Max. - Max
835 ± 50 4,700 ± 150 4,500 ± 100
1.5 m
-1 (46 %) 3 m-1 (70 %)
DESCRIPTION BRAND/TYPE SPECIAL NOTES
High pressure pumpBOSCH
CR/CP153/R65/10-15Pressure from 250 to 1350 bars
Supercharging pump (low
pressure)BOSCHPressure from 2.5 to 4 bars
Flow: 80 to 100 litres/hour minimum
Diesel pressure sensor BOSCHFitted to the injection rail
Resistance: tracks 1,2 and 1,3 = 4.3 MΩ
tracks 2,3 = 1050 Ω
Injectors BOSCHSolenoid injector
Resistance: < 2 Ω
Maximum pressure 1525 bars
Pressure regulator - Integrated with the high pressure pump
Resistance: ≈ 5 Ω at 20˚ C
Injection computer BOSCH128 track computer
Pre-postheating unit NAGARES BED/7With pre-postheating function controlled by the
injection computer
Heater plugsBERU
or
CHAMPIONResistance: 0.6 Ω connector removed
Accelerator potentiometer CTSDouble track potentiometer
Track resistance ≈ 1.7 Ω
Air intake temperature sensor SIEMENSintegrated in the flow meter
Resistance between 100 Ω and 40 Ω
13-1

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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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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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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

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Checking diesel pressure and flow
13
13-37
Checking diesel pressure and flow
It is possible to check the pressure and flow in the low pressure fuel circuit.
The low pressure is delivered by the supercharging pump (electric pump located under the diesel filter designed to
feed the high pressure pump).
SPECIAL TOOLING REQUIRED
Mot. 1311-01
Pressure gauge or
Mot. 1328
Mot. 1311-08 Pressure measuring connector
ESSENTIAL SPECIAL TOOLING
Graduated 2000 ml test tube
CHECK LOW PRESSURE
(SUPERCHARGING PUMP)
Place a "T" connector Mot. 1311-08, to position the
pressure gauge Mot. 1311-01 or Mot. 1328 at the
outlet (S) of the fuel filter or at the HP pump inlet.
Turn the fuel pump using the diagnostic tool or by
directly feeding the pump (each time the ignition is
switched on the low pressure pump is supplied for
30 seconds).
Measure the pressure which should be between
2.5 and 4 bars.CHECK THE FLOW (SUPERCHARGING PUMP)
Make the pump flow into a 2000 ml graduated test
tube. Turn on the ignition to run the pump. The pump is
supplied for 30 seconds if the engine is not started.
The flow read should be 80 to 100 litres/hour
minimum.
IMPORTANT: it is forbidden to measure the
pressure and the flow of the high pressure pump.
15773R1