2011 RENAULT SCENIC fuel pump

13B - 8
DIESEL INJECTION
Fault finding - Introduction13B
V10 MR-372-J84-13B150$047.mif
EDC16 INJECTION
Program No.: C1
Vdiag No.: 44, 48 and 4C
Instructions to be followed before any work is carried out on the injection system:
Protect the accessories and timing belts, the electrical accessories (starter, alternator, electric power-assisted
steering pump) and the mating face to prevent diesel fuel spilling onto the clutch friction plate.
Check that you have plugs for the unions to be opened (set of plugs available from the Parts Department). The plugs
are single-use only. After use, they must be discarded (once used they are soiled and cleaning is not sufficient to
make them reusable). Unused plugs must be discarded.
Ensure that you have hermetically resealable plastic bags for storing removed parts. There is less risk of parts
stored in this way being exposed to contamination. These are single-use bags; after use they must be discarded.
Use lint-free cleaning cloths (part no. 77 11 211 707). Using normal cloth or paper is prohibited. They are not lint-free
and could contaminate the fuel circuit. Each cloth should only be used once.
Use fresh cleaning agent for each operation (used cleaning agent is contaminated). Pour it into an uncontaminated
container.
For each operation, use a clean brush in good condition (the brush must not shed its bristles).
Use a brush and cleaning agent to clean the unions to be opened.
Blast compressed air over the cleaned parts (tools, workbench, and the parts, unions and injection system area).
Check that no bristles remain.
Wash your hands before and during the operation if necessary.
When wearing leather protective gloves cover them with latex gloves to prevent contamination.
Instructions to be followed during the operation
As soon as the circuit is open, all openings must be plugged to prevent impurities from entering the system. The
plugs to be used are available from the Parts Department. They must not be reused under any circumstances.
Close the hermetically sealed bag, even if it has to be reopened shortly afterwards. Ambient air carries impurities.
All components removed from the injection system must be stored in a hermetically sealed plastic bag once they
have been plugged.
Using a brush, thinner, air gun, rifle-type brush or normal rag is strictly prohibited once the circuit has been opened.
These items are likely to allow impurities to enter the system.
If a component is being replaced with a new component, do not remove the packaging until it is ready to be fitted to
the vehicle.

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-66
DIESEL INJECTION
Fault finding - Interpretation of faults13B
V10 MR-372-J84-13B150$329.mif
EDC16 INJECTION
Program No.: C1
Vdiag No.: 44, 48 and 4C
DF053
PRESENT
OR
STORED
RAIL PRESSURE REGULATION FUNCTION
CC.1 : Short circuit to + 12 V
CC.0 : Short circuit to earth
CO : Open circuit
1.DEF : Internal electrical fault
2.DEF : Measured pressure too low
3.DEF : Measured pressure too high
4.DEF : Insufficient pressure
5.DEF : Pressure < minimum
6.DEF : Pressure > maximum
7.DEF : Extensive pump command
8.DEF : significant pump control at idle speed
NOTESConditions for applying the fault finding procedure to a stored fault:
The fault is declared present following a road test or after attempting to start the engine.
Special notes:
If the fault is present:
– It is not possible to start the engine.
– the level 2 warning light is lit.
Use bornier Ele. 1681 for all operations on the injection computer connectors.
CC.1
NOTESNone.
Check the rail pressure regulator connectors.
Check the injection computer connections.
Check the low pressure circuit.
Check the conformity of the fuel used, apply test 5 Diesel fuel conformity check.
Check the injector return flow, run test 1 Injector test.
Check the operation of the overpressure valve if fitted to the vehicle, run test 6 Incorrect operation of the
overpressure valve.
Repair if necessary.
Measure the resistance of the rail pressure regulator between tracks 1 and 2.
If the resistance is not 3Ω ±1 at 20°C, replace the injection pump.
Check the continuity and insulation from + 12 V on the following connection:
Injection computer brown 48-track connector B, track M4 Track 2 of the fuel flow actuator
If the fault is still present, replace the injection pump.
AFTER REPAIRDeal with any faults.
Carry out a road test followed by another check with the diagnostic tool.
EDC16_V08_DF053/EDC16_V10_DF053/EDC16_V14_DF053

13B-67
DIESEL INJECTION
Fault finding - Interpretation of faults13B
V10 MR-372-J84-13B150$329.mif
EDC16 INJECTION
Program No.: C1
Vdiag No.: 44, 48 and 4C
DF053
CONTINUED 1
CC.0
CO
NOTESNone.
Check the fuel flow regulator connections.
Check the injection computer connections.
Check the low pressure circuit.
Check the conformity of the fuel used, apply test 5 Diesel fuel conformity check.
Check the injector return flow, run test 1 Injector test.
Check the operation of the overpressure valve if fitted to the vehicle, run test 6 Incorrect operation of the
overpressure valve.
Repair if necessary.
Measure the resistance of the flow regulator between tracks 1 and 2.
If the resistance is not 3Ω ±1 at 20°C, replace the injection pump.
Check the continuity and insulation from earth of the following connection:
Injection computer brown 48-track connector B, track M4 Track 2 of the fuel flow regulator
With the ignition on, check for + 12 V after relay feed on track 1 of the fuel flow regulator.
If the fault is still present, replace the injection pump.
AFTER REPAIRDeal with any faults.
Carry out a road test followed by another check with the diagnostic tool.

13B-68
DIESEL INJECTION
Fault finding - Interpretation of faults13B
V10 MR-372-J84-13B150$329.mif
EDC16 INJECTION
Program No.: C1
Vdiag No.: 44, 48 and 4C
*Opening cyclic ratioDF053
CONTINUED 2
1.DEF
NOTESNone.
Check the rail pressure regulator connectors.
Check the injection computer connections.
Check the low pressure circuit.
Check the conformity of the fuel used, apply test 5 Diesel fuel conformity check.
Check the injector return flow, run test 1 Injector test.
Check the operation of the overpressure valve if fitted to the vehicle, run test 6 Incorrect operation of the
overpressure valve.
Repair if necessary.
Measure the resistance of the flow regulator between tracks 1 and 2.
If the resistance is not 3Ω ±1 at 20°C, replace the injection pump.
Check the continuity and absence of interference resistance of the following connections:
Injection computer brown 48-track connector B, track M4 Track 2 of the fuel flow regulator
UPC, connector PPM1, track 1 Track 1 of the rail pressure
regulator
Repair if necessary.
AFTER REPAIRDeal with any faults.
Carry out a road test followed by another check with the diagnostic tool.

13B-69
DIESEL INJECTION
Fault finding - Interpretation of faults13B
V10 MR-372-J84-13B150$329.mif
EDC16 INJECTION
Program No.: C1
Vdiag No.: 44, 48 and 4C
DF053
CONTINUED 3
2.DEF to
8.DEF
NOTESNone.
Check the operation of the overpressure valve if fitted to the vehicle, run test 6 Incorrect operation of the
overpressure valve.
In the event of rail overpressure:
Check that the injectors are operating correctly (see Component test, Test 1, Injector Test).
Check that the rail pressure sensor is operating correctly using command AC011 Rail pressure regulator.
Display parameter PR038 Rail pressure, and refer to the conformity check to check the operating values.
If these checks do not indicate any abnormality and if the fault is still present, replace the injection pump.
in the event of rail underpressure:
Check that the rail pressure sensor is operating correctly using command AC011 Rail pressure regulator.
Display parameter PR038 Rail pressure, and refer to the conformity check to check the operating values.
Check the low pressure diesel circuit priming.
Check the conformity of the diesel filter connections.
Check the condition of the filter (clogging and water saturation).
Check that there are no air bubbles between the filter and the high pressure pump.
Check the low and high pressure diesel fuel circuit sealing (visual inspections, odour, etc.): pump housing,
pressure relief valve, pipes, rail and injector unions, injector wells, etc.
Check that the injectors are operating correctly (see Component test, Test 1, Injector Test).
Carry out the necessary operations.
If the fault is still present, replace the injection pump.
If the fault is still present, replace the injection pump.
AFTER REPAIRDeal with any faults.
Carry out a road test followed by another check with the diagnostic tool.