2000 RENAULT SCENIC Cool

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Cylinder head gasket
11
11-12
REFITTING (special notes)
Fit the cylinder head gasket. This is centred by two
dowels.
Bring the pistons to mid-stroke position to prevent
them from coming into contact with the valves as the
cylinder head is tightened.
Centre the cylinder head on the dowels.
Lubricate the threads and under the heads of the
mounting bolts.
Tighten the cylinder head using an angular tightening
wrench (see section '07 "Tightening the cylinder
head").
Tightening procedure for the automatic tensioner
mounting
Offer up the three touching bolts then apply a torque of
2.5 daN.m respecting the order shown below.
Refitting is the reverse of removal.
Refit the timing belt, (see procedure described in
section 11 "Timing belt").
Fill and bleed the cooling circuit, (see section 19
"Filling and Bleeding").
To reprime the diesel circuit, consult section 13, "Fuel
filter".
PRF1102

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Pressure regulating valve
12
12-2
TURBOCHARGING
Pressure regulating valve
The LDA (A) of the pressure regulation valve is controlled by a solenoid valve (B) which is controlled by the injection
computer. This solenoid valve varies the underpressure as a function of the engine operating ranges, which allows
the turbocharging pressure to be regulated.
The pressure regulation valve is open in rest position. The engine operates as normally aspirated.
The solenoid valve, closed in rest position, is supplied after starting the engine, after a delay dependent on the coolant
temperature.
Delay (s)
Temperature (˚C)

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Special notes
13
13-3
Special notes
The common rail direct high pressure injection system aims to deliver a certain quantity of diesel to the engine at a
specific time.
DESCRIPTION
The system consists of:
– a low pressure pump (1) (located between the induction unit and the fuel filter),
– a fuel filter (2),
– a high pressure pump (3),
– a high pressure regulator (4) attached to the pump,
– an injection rail (5) fitted with a diesel pressure sensor,
– a priming fuel cock (6) (open in normal mode) (depending on version),
– a fuel cooler (7),
– four solenoid injectors,
– various sensors,
– an injection computer.
Removal of the interior of the high pressure pump and the injectors is prohibited.
16311R

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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
13-15
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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Idle speed correction
13
13-16
Idle speed correction
IDLING SPEED CORRECTION ACCORDING TO COOLANT TEMPERATURE
CORRECTION OF THE IDLING SPEED WHEN THE POTENTIOMETER IS FAULTY
If the accelerator pedal potentiometer is faulty, idling speed is held at 1200 rpm.
If the information from the accelerator pedal position potentiometer and the brake switch information does not
correspond, the speed is changed to 1250 rpm.
CORRECTION OF THE IDLING SPEED ACCORDING TO THE GEAR RATIOS
The running idling speed is modified according to the gear engaged in the gearbox:
– in 1
st, 2nd and 3rd gears the speed is 835 rpm.,
– for other gears the speed is 925 rpm.

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Pre-postheating control
13
13-17
Pre-postheating control
The pre-postheating function is controlled by the preheating unit.
OPERATING PRINCIPLE FOR PRE-POST HEATING
1) "Preheating" on ignition
a) Variable preheating
The warning light lighting time and the
supply to heater plugs time depends on the
coolant temperature and the battery
voltage.
In all cases the injection warning light
lighting time cannot exceed 15 seconds.
b) Fixed preheating
After the warning light goes out the plugs
remain supplied for a fixed period of
10 seconds.2) Starting
The plugs remain supplied while the starter is
being activated.
3) "Postheating" while the engine is running
During this phase the plugs are supplied
continuously according to coolant temperature.
time (s)
Coolant
temperature °C For idling speed without
depression of the accelerator
pedal.

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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