Page 50 of 118
Downloaded from www.Manualslib.com manuals search engine FUEL MIXTURE
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
Page 53 of 118

Downloaded from www.Manualslib.com manuals search engine DIESEL EQUIPMENT
Specifications
13
13-2
DESCRIPTION MAKE/MODEL SPECIAL NOTES
Diesel temperature sensorMAGNETTI
MARELIResistance: ≈ 2.050 Ω at 25 ˚C
Engine speed sensor MGI Resistance: 800 ± 80 Ω
Atmospheric pressure sensor - Integrated in the computer
Camshaft sensor ELECTRIFIL Hall effect sensor
Turbocharger pressure sensor DELCOResistance : 4 KΩ across tracks A and C
Resistance : 5 KΩ across tracks A and C
Resistance : 9 KΩ across tracks A and B
Turbocharger operating
solenoidBITRON Resistance 16.5±1 Ω at 25 ˚C
Air flow meter SIEMENSFlow meter with integrated air temperature sensor
track 1 : air temperature
track 2 : earth
track 3 : 5 V reference
track 4 : + battery feed
track 5 : air flow signal
track 6 : earth
EGR solenoid valve PIERBURGTrack resistance: 8±0.5 Ω to 20 ˚C (tracks 1 and 5)
Sensor resistance: 4 KΩ to 20 ˚C (tracks 2 and 4)
Turbocharger KKKCalibration :
120 mbars for rod travel between 1 and 4 mm
400 mbars for a stroke between 10 and 12 mm
Thermal plungers - Resistance: 0.45 ± 0.05 Ω at 20 ˚C
Page 68 of 118
Downloaded from www.Manualslib.com manuals search engine DIESEL EQUIPMENT
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.
Page 71 of 118
Downloaded from www.Manualslib.com manuals search engine DIESEL EQUIPMENT
Thermal plunger
13
13-20
If the battery voltage is > 13.5 volts
if not then
Thermal plungers
not suppliedOne thermal plunger
supplied
If after 20 seconds the battery
voltage is
> 13.5 volts
if not then
Thermal plungers
not suppliedTwo thermal plungers
supplied
If after 20 seconds
the battery voltage is
> 13.5 volts
if not then
Thermal plungers
not suppliedThree thermal plungers
supplied if the battery
voltage is
> 13.5 volts and if the
conditions mentioned above
are fulfilled
Page 75 of 118
Downloaded from www.Manualslib.com manuals search engine DIESEL EQUIPMENT
High pressure pump
13
13-24
REMOVAL
Disconnect the battery.
Set the engine to top dead centre using the pin
Mot. 1054.
Release from the fuel filter from its support.
Remove:
– the injection computer mounting,
– the high pressure pulley cover,
– the pump outlet/injection rail inlet pipe using
Mot.1383.
Insert the blanking plugs.
Disconnect the fuel return pipe from the pump and
insert the plugs to maintain cleanness.
Fit tool Mot. 1200-01 on the pulley.Remove the nut from the high pressure pump pulley.
Fit the extractor Mot. 1525 fitted with the adaptor
Mot. 1525-01 on the pulley pump then disassemble
the unit.
Remove the mounting nuts by holding the bolts (1). YOU SHOULD FOLLOW THE CLEANNESS
INSTRUCTIONS CLOSELY
16870S
15872R1
16183R
Page 79 of 118
Downloaded from www.Manualslib.com manuals search engine DIESEL EQUIPMENT
Injector rail
13
13-28
REMOVAL
Disconnect:
– the battery,
– the pressure sensor (1),
– the injectors,
– the cylinder marking sensor.
Undo and remove the diesel HP pipes.
Insert the plugs to maintain cleanness.
Gently remove the injection rail.YOU SHOULD FOLLOW THE CLEANNESS INSTRUCTIONS CLOSELY
16192-2R
Page 89 of 118
Downloaded from www.Manualslib.com manuals search engine DIESEL EQUIPMENT
Pressure sensor
13
13-38
Pressure sensor
TIGHTENING TORQUES (In daN.m or/and°)
Pressure sensor 3.5 ± 0.5
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.
PRESSURE SENSOR (1)
REMOVAL
Disconnect the battery.
Remove the sensor connector.
Unscrew the pressure sensor.REFITTING
Replace the seal.
Screw in the sensor then tighten it to torque.
Connect the connector. YOU SHOULD FOLLOW THE CLEANNESS
INSTRUCTIONS CLOSELY.
After any intervention, check that there are no leaks in the diesel circuit.
Start the engine at idling speed until the fan starts up, then accelerate
several times under no load.
16192R2
Page 90 of 118

Downloaded from www.Manualslib.com manuals search engine DIESEL EQUIPMENT
Pressure regulator
13
13-39
Pressure regulator
TIGHTENING TORQUES (In daN.m or/and °)
Regulator bolt 0.9 ± 0.1
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.
PRESSURE REGULATOR (2)
REMOVAL
Disconnect the battery.
Remove the regulator connector.
Remove the retaining bracket for the diesel
temperature sensor.
Unscrew the regulator mounting bolts.
Remove the regulator by turning in an anticlockwise
direction (do not use any tools as a lever when
removing the pump regulator).REFITTING
Change the seals.
Dampen the seals with clean diesel.
Replace the regulator in the pump by turning it in an
anticlockwise direction (do not use any tools as a lever
when replacing the pump regulator).
Fit the mounting bolts then tighten to torque.
Connect the connector. YOU SHOULD FOLLOW THE CLEANNESS
INSTRUCTIONS CLOSELY.
After any intervention, check that there are no leaks in the diesel circuit.
Start the engine at idling speed until the fan starts up, then accelerate
several times under no load.