2011 RENAULT SCENIC sensor

13B - 9
DIESEL INJECTION
Fault finding - System operation13B
V10 MR-372-J84-13B150$094.mif
EDC16 INJECTION
Program No.: C1
Vdiag No: 44, 48 and 4CDIESEL INJECTION
Fault finding - System operation
The high pressure injection system is designed to deliver a precise quantity of diesel fuel to the engine at a set
moment.
It is fitted with a 112-track BOSCH EDC16C3 type computer.
The system comprises:
– a diesel filter,
– a high pressure pump with an integrated low pressure pump (transfer pump),
– a high pressure regulator mounted on the pump,
– an injection rail,
– a diesel fuel pressure sensor integrated into the rail,
– four solenoid injectors,
– a diesel fuel temperature sensor,
– a coolant temperature sensor,
– an upstream air temperature sensor,
– a cylinder reference sensor,
– an engine speed sensor,
– a turbocharging pressure sensor,
– an accelerator pedal potentiometer,
– an EGR solenoid valve,
– an atmospheric pressure sensor integrated into the injection computer,
– an air flow sensor,
– a turbocharging pressure limitation solenoid valve,
– a damper flap solenoid valve.
The common rail direct high pressure injection system works sequentially (based on the petrol engine multipoint
injection function).
This injection system reduces operating noise, reduces the volume of pollutant gases and particles and produces
high engine torque at low engine speeds thanks to a pre-injection procedure.
The high pressure pump generates the high pressure and transmits it to the injection rail. The actuator located on
the pump controls the quantity of diesel fuel supplied, according to the requirement determined by the computer.
The rail supplies each injector through a steel pipe.
MR-372-J84-13B150$094.mif

13B - 10
DIESEL INJECTION
Fault finding - System operation13B
V10 MR-372-J84-13B150$094.mif
EDC16 INJECTION
Program No.: C1
Vdiag No: 44, 48 and 4C
a) The computer
– Determines the value of injection pressure necessary for the engine to operate correctly 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.
– It determines the injection timing required to deliver the right quantity of diesel fuel and the moment when injection
should start.
– Controls each injector electrically and individually after determining these two values.
The flow injected into the engine is determined by:
– the duration of injector control,
– the rail pressure (regulated by the computer),
– the injector opening and closing speed,
– the needle stroke (determined by a constant for the type of injector),
– the nominal hydraulic flow of the injector (specific to each injector).
The computer manages:
– idling regulation,
– exhaust gas flow reinjection to the inlet,
– fuel supply check (advance, flow and rail pressure),
– the fan assembly via the Protection and Switching Unit (centralised coolant temperature management
function),
– the air conditioning (cold loop function),
– the cruise control/speed limiter function,
– the pre-postheating control.
– the fault warning lights via the multiplex network.
The high pressure pump is supplied at low pressure by an integrated low-pressure pump (transfer pump).
It supplies the rail, the pressure of which is controlled by the fuel flow actuator for charging, and for discharging by
the injector valves. This compensates for pressure drops.
The fuel flow actuator enables the high pressure pump to supply the exact quantity of diesel fuel required to maintain
the rail pressure. This component minimises the heat generated and improves engine output.
In order to discharge the rail using the injector valves, the valves are controlled by brief electrical pulses which are:
– short enough not to open the injector (passing through the feedback circuit from the injectors),
– long enough to open the valves and discharge the rail.

13B - 11
DIESEL INJECTION
Fault finding - System operation13B
V10 MR-372-J84-13B150$094.mif
EDC16 INJECTION
Program No.: C1
Vdiag No: 44, 48 and 4C
Multiplex connection between the vehicle's various computers
The Mégane II electronic system is a multiplex network. This enables dialogue between the various vehicle
computers. As a result:
– the activation of the fault warning lights on the instrument panel is performed by the multiplex network, with the
vehicle speed sensor on the gearbox deactivated,
– the vehicle speed signal is transmitted by the ABS-ESP computer via the multiplex network.
The system can inject diesel fuel into the engine at a pressure of up to 1350 bar. Before each operation, check that
the injection rail is depressurised and that the fuel temperature is not too high.
When working on the high pressure injection system, you must follow the cleanliness guidelines and safety advice
specified in this document.
Removal of the internal parts of the pump and injectors is prohibited. Only the fuel flow actuator, the diesel fuel
temperature sensor and the air vent unit can be replaced.
For safety reasons, it is strictly prohibited to undo a high pressure pipe union when the engine is running.
It is not possible to remove the pressure sensor from the fuel rail because this may cause circuit contamination
faults. If the pressure sensor fails, the pressure sensor, the rail and the five high pressure pipes must be replaced.
It is strictly prohibited to remove any injection pump pulley bearing the number 070 575. If the pump needs to be
replaced, replace the pulley.
Supplying + 12 V directly to any component in the system is prohibited.
Ultrasonic decoking and cleaning are prohibited.
Never start the engine unless the battery is connected correctly.
Disconnect the injection computer when carrying out any welding work on the vehicle. IMPORTANT
The engine must not operate with:
– Diesel fuel containing more than 10 % diester,
– Petrol, even in tiny quantities.

13B - 15
DIESEL INJECTION
Fault finding - System operation13B
V10 MR-372-J84-13B150$094.mif
EDC16 INJECTION
Program No.: C1
Vdiag No: 44, 48 and 4C
d) OBD management
The OBD (On Board Diagnostic) system enables detection of any faults relating to the vehicle emission control
system (OBD EURO IV emission control standards exceeded).
This system should be active for the entire life of the vehicle.
1. Conditions causing an OBD fault
An OBD fault will be detected after 3 operating cycles, and the following parameters will be saved in the calculator:
– engine load,
– vehicle speed,
– air temperature,
– coolant temperature,
– turbocharging pressure,
– rail pressure,
–air flow,
– vehicle mileage.
It allows the driver to know whether their vehicle has a fault directly linked to the emission control system.
2. System faults indicated by the OBD
Only a few faults are indicated by the OBD system:
–DF012 Sensor supply voltage no. 2.
–DF038 Computer.
–DF040 Cylinder 1 injector circuit.
–DF041 Cylinder 2 injector circuit.
–DF042 Cylinder 3 injector circuit.
–DF043 Cylinder 4 injector circuit.
–DF209 EGR valve position sensor circuit.
–DF272 EGR valve control circuit.
–DF621 EGR valve jammed open.
Some repair operations require programming to ensure that certain engine components function correctly.
Follow the programming procedures (described in the component replacement section), if replacing an
exhaust gas recirculation valve or an injector.

13B - 18
DIESEL INJECTION
Fault finding - Allocation of computer tracks13B
V10 MR-372-J84-13B150$141.mif
EDC16 INJECTION
Program No.: C1
Vdiag No: 44, 48 and 4C
2 - Brown connector B, 48-track 2 - Brown connector B, 48-track (continued)
Track Description
A1 Camshaft sensor earth
A2 Not used
A3 Not used
A4 Fuel rail pressure sensor supply
B1 TDC sensor supply signal
B2 Not used
B3 Not used
B4 Air flow sensor supply
C1 TDC sensor earth signal
C2 Not used
C3 Not used
C4 Fuel rail pressure sensor earth
D1 Camshaft sensor signal
D2 Not used
D3 Not used
D4 Turbocharging pressure sensor earth
E1 Injection locking relay coil earth control
E2 Air flow sensor earth signal
E3 Not used
E4 Not used
F1 Refrigerant pressure sensor signal
F2 Coolant temperature sensor supply signal
F3 Refrigerant pressure sensor supply
F4 EGR valve position sensor supply
G1 Air flow sensor supply signal
G2 Air temperature signal
G3 Fuel rail pressure sensor signal
G4 Turbocharging pressure sensor supply
Track Description
H1 Injection coolant temperature sensor earth
H2 Fuel temperature signal
H3 Not used
H4 Not used
J1 Not used
J2 Gas recirculation potentiometer signal
J3 Not used
J4 Inlet flap solenoid valve control
K1 Not used
K2 Turbocharging pressure sensor signal
K3 Not used
K4 Not used
L1 Not used
L2 Gas recirculation solenoid valve control
L3 Not used
L4 Flow sensor earth
M1 Not used
M2 UPC supply
M3 Not used
M4 Fuel pressure regulation solenoid valve
control

13B - 19
DIESEL INJECTION
Fault finding - Allocation of computer tracks13B
V10 MR-372-J84-13B150$141.mif
EDC16 INJECTION
Program No.: C1
Vdiag No: 44, 48 and 4C
3 - Grey connector C, 32-track
Track Description
A1 Not used
A2 Water in diesel detection sensor signal
A3 Not used
A4 Preheating relay fault finding signal
B1 Not used
B2 Not used
B3 Not used
B4 Not used
C1 Not used
C2 EGR solenoid valve earth
C3 Refrigerant pressure sensor earth
C4 Not used
D1 Not used
D2 Not used
D3 Not used
D4 Not used
E1 Turbocharging pressure solenoid valve
control
E2 Preheating relay control
E3 Not used
E4 Not used
F1 Fuel temperature earth
F2 Not used
F3 Not used
F4 Not used
G1 Injector 4 control
G2 Injector 2 control
G3 Injector 1 earth
G4 Injector 2 earth
H1 Injector 1 control
H2 Injector 3 control
H3 Injector 4 earth
H4 Injector 3 earth

13B - 23
DIESEL INJECTION
Fault finding - Fault summary table13B
V10 MR-372-J84-13B150$235.mif
EDC16 INJECTION
Program No.: C1
Vdiag No.: 44, 48 and 4CDIESEL INJECTION
Fault finding - Fault summary table
WARNING LIGHT MANAGEMENT
Management of instrument panel warning lights according to the faults notified.
Tool
fault
Associated
DTCDiagnostic tool titleLevel 1 fault
warning light
(Orange heater
plugs “on”
indicator light)Level 2 fault
warning light (Red
overheating
warning light)No fault
warning
light litOBD
warning
light lit
DF001 115Coolant temperature sensor
circuitCO.1/CC.0 ... ... ...
DF003 105Atmospheric pressure sensor
circuit1.DEF / 2.DEF /
3.DEF... ... ...
DF004 235Turbocharging pressure sensor
circuitCO.0 / CC.1 ... 1.DEF ...
DF005 335Engine speed sensor circuit ... ... 1.DEF/2.DEF ...
DF007 190Rail pressure sensor circuit CO.1 / 1.DEF /
2.DEFCC.0 ...
DF008 225Pedal potentiometer circuit
gang 1CO.0/CC.1/
1.DEF/2.DEF... ... ...
DF009 2120Pedal potentiometer circuit
gang 2CO.0/CC.1/
1.DEF... ... ...
DF011 641Sensor feed voltage no. 1 1.DEF/2.DEF ... ... ...
DF012 651Sensor feed voltage no. 2 1.DEF/2.DEF ... ... 1.DEF/
2.DEF
DF013 697Sensor feed voltage no. 3 ... 1.DEF/2.DEF ... ...
DF015 685Main relay control circuit ... ... 1.DEF/2.DEF ...
DF017 380Pre-postheating unit control
circuitCC.0 ... CC.1/CO/
1.DEF...
DF025 670Preheating unit diagnostic line ... X ...
DF037 C167Engine immobiliser ... X ...
DF038 606Computer 5.DEF / 13.DEF 1.DEF / 2.DEF /
3.DEF / 4.DEF /
6.DEF / 7.DEF /
8.DEF / 9.DEF /
10.DEF / 11.DEF /
12.DEF... 5.DEF
DF039 110Inlet air temperature sensor
circuit... ... CC.0/CO.1/
1.DEF...
MR-372-J84-13B150$235.mif

13B - 24
DIESEL INJECTION
Fault finding - Fault summary table13B
V10 MR-372-J84-13B150$235.mif
EDC16 INJECTION
Program No.: C1
Vdiag No.: 44, 48 and 4C
Tool
faultAssociated
DTCDiagnostic tool titleLevel 1
fault warning
light (Orange
heater plugs
“on” indicator
light)Level 2 fault
warning light
(Red overheating
warning light)No fault
warning
light litOBD
warning
light lit
DF040 201Cylinder 1 injector circuit CO CC.1 / CC / 1.DEF ... CO
DF041 202Cylinder 2 injector circuit CO CC.1 / CC / 1.DEF ... CO
DF042 203Cylinder 3 injector circuit CO CC.1 / CC / 1.DEF ... CO
DF043 204Cylinder 4 injector circuit CO CC.1 / CC / 1.DEF ... CO
DF046 560Battery voltage ... ... 1.DEF/2.DEF ...
DF047 615Computer feed voltage ... ... X ...
DF049 530Refrigerant sensor circuit ... ... CC.1/CO.0 ...
DF050 571Brake switch circuit ... ... 1.DEF/2.DEF ...
DF051 575Cruise control/speed limiter
function... ... 1.DEF /
2.DEF /
3.DEF...
DF053 89Rail pressure regulation function 3.DEF / 8.DEF CC.0 / CC.1 / CO /
1.DEF / 2.DEF /
5.DEF / 6.DEF / 7.DEF4.DEF ...
DF054 33Turbocharging solenoid valve
control circuitCO/CC.0/CC.1/
1.DEF... ... ...
DF055 243Turbocharging pressure
regulation circuit1.DEF/2.DEF ... ... ...
DF056 100Air flow sensor circuit 3.DEF/4.DEF ... CC.0/CC.1/
1.DEF/2.DEF
DF057 2264Water in diesel fuel detector
circuit... ... X ...
DF067 638Damper control circuit ...
CC.0OC / CC.1 /
1.DEF...
DF069 1620Impact detected signal X
DF070 830Clutch switch circuit ... ... 1.DEF/2.DEF ...