inlet air RENAULT SCENIC 2012 J95 / 3.G Engine And Peripherals EDC16CP33 Workshop Manual

13B-12V12 MR-372-J84-13B300$030.mif
DIESEL INJECTION
Fault finding – System operation13B
EDC16CP33
Program No.: C4
Vdiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74
a. The computer:
Determines the injection pressure value necessary for the correct operation of the engine; the pressure can reach
1600 bar in the rail and it must be constantly regulated.
Checks that the pressure value is correct by analysing the value transmitted by the pressure sensor located on
the rail.
Determines the injection duration 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 quantity of fuel injected is determined by:
– Engine speed (Crankshaft + Cam for synchronisation).
– Accelerator pedal.
– Turbocharging pressure.
– Coolant temperature,
– Inlet air temperature.
–Air flow
– Pressure in the rail.
– Vehicle speed.
The computer manages:
– idling regulation,
– exhaust gas flow reinjection to the inlet,
– fuel supply check (advance, flow and rail pressure),
– the fan assembly control,
– the air conditioning (cold loop function),
– cruise control/speed limiter function,
– pre-post heating control,
– indicator lights control via the multiplex network,
– the operation of the catalysed particle filter,
– turbocharging pressure.
The high pressure pump is supplied at low pressure by an integrated low pressure pump (transfer pump).
It supplies the rail, the pressure in which is regulated by:
–the pressure regulator on the rail (DRV) for starting phases, starting the engine when cold (increase in
temperature to heat the diesel circuit) and when throttling-off,
–the pressure regulator on the pump (MPROP) for all other phases (90% of cases).
As natural leaks in piezoelectric injectors are very low, opening the pressure regulator (DRV) is the only quick
method of dumping the rail pressure and it prevents overpressure when injection is restarted.
The pressure regulator on the pump (MPROP) enables the high pressure pump to supply just the exact quantity
of diesel fuel required to maintain the rail pressure. This component minimises the heat generated and improves
engine output.
Note:
Each piezoelectric injector is connected to the return rail. The injector return rail is kept pressurised by a
mechanical valve at the end of the return rail with a 10 bar calibration (by comparison, solenoid injectors used to
return directly into the common fuel return circuit). This feature is linked to the operation of piezoelectric injectors.

13B-16V12 MR-372-J84-13B300$030.mif
DIESEL INJECTION
Fault finding – System operation13B
EDC16CP33
Program No.: C4
Vdiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74
III - Management of the damper valve
The damper valve is now responsible for two functions:
– Damping: when the engine is switched off, the flap closes in order to block the passage of air towards the cylinders.
The aim of this is to stop the engine as quickly as possible and to reduce instabilities when the engine is switched
off.
– "Valving" function depending on the engine operation: the damper valve closes by a few % to create a "venturi"
effect at the EGR valve passage section.
The aim of this is to accelerate the air flow of EGR gases and to reduce the emission of pollutants.
IV - Exhaust gas recirculation management
The EGR (Exhaust Gas Recirculation) system involves removing exhaust gases and reintroducing them into the
inlet.
This system plays a major role in reducing diesel engine emissions. The EGR system is cooled by a gas - water
exchanger, as on most Euro IV engines. This cooler has a dual position bypass valve, which allows the gas to be
cooled or not depending on the emission control requirements. The bypass circuit is inside the cooler (not visible
from the outside). The valve control rod is visible from the outside.
The exhaust gases are collected in the exhaust manifold (before the turbocharger), then directed to the EGR cooler
and the EGR valve. The EGR valve connects the air circuit between the damper valve and the inlet manifold; the
EGR valve is positioned next to the damper valve.
The EGR valve is activated every time the engine stops by performing 10opening/closing cycles. This programming
activates the EGR valve in order to prevent it from clogging. The program is no longer active if there are any system
faults.
The EGR system does not operate below 5°C (air flowmeter temperature).
– The controlled EGR cooler bypass
The EGR cooler bypass is controlled by an all-or-nothing solenoid valve, connected on one side to the vacuum
pump, and on the other side to the bypass control diaphragm. It is actuated according to the coolant temperature
and the engine operating status. Gases flow into the EGR section of the cooler unless the engine is cold, in which
case they flow through the bypass valve. There is also a regular actuation function for the bypass valve to prevent it
from clogging.
– EGR valve
The EGR valve is supplied by direct current and connected to a potentiometer copying the position of the valve.
The opening of the valve is actuated (H bridge) by a positive command 0 to 100%.
The valve is controlled using a double regulation loop.
The first loop (fastest) is a position loop. It brings the valve to the desired position by a loop connection using the
signal from the position sensor.
The second loop is slower and is an air flow loop. At a given operating point, the air flow setpoint is attained by
adjusting the quantity of exhaust gas flowing through the EGR valve and the flow of fresh air passing through the
damper valve. At a total constant flow, the more exhaust gas recirculation, the less fresh air there is and vice versa.
The air flow is measured by the flowmeter and the setpoint is attained using both the EGR valve position setpoint
and the damper valve position setpoint.

13B-34
AFTER REPAIRDeal with any other faults. Clear the fault memory.
Switch off the ignition until the end of the power-latch phase, and carry out a road test
followed by a check with the diagnostic tool.
V12 MR-372-J84-13B300$071.mif
DIESEL INJECTION
Fault finding – Interpretation of faults13B
EDC16CP33
Program No.: C4
Vdiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74
DF002
PRESENT
OR
STOREDAIR TEMPERATURE SENSOR CIRCUIT
CC.0: Short circuit to earth
CO.1: Open circuit or short circuit to +12 V
NOTESPriorities when dealing with a number of faults:
– DF046 Battery voltage.
Conditions for applying the fault finding procedure to a stored fault:
If the fault is declared present after:
– the ignition is switched on,
– starting the engine,
– a road test.
Special notes:
If the fault is present:
–The EOBD (European On Board Diagnostic) warning light is lit.
– the thermoplungers are inhibited,
– the inlet air temperature is in defect mode, PR059 Inlet air temperature = 20°C (with
the engine running).
The air temperature sensor is integrated into the air flowmeter.
Use bornier Elé. 1681 for all operations on the engine management computer
connectors.
Use the Wiring Diagram Technical Note, Laguna II ph2, Vel Satis ph2, Espace IV
ph2, Mégane II ph2, Scénic II ph2.
EDC16CP33_V18_DF002 / EDC16CP33_V1C_DF002 / EDC16CP33_V54_DF002 / EDC16CP33_V20_DF002 / EDC16CP33_V58_DF002 /
EDC16CP33_V5C_DF002 / EDC16CP33_V24_DF002 / EDC16CP33_V04_DF002 / EDC16CP33_V08_DF002 / EDC16CP33_V44_DF002 /
EDC16CP33_V4C_DF002 / EDC16CP33_V34_DF002 / EDC16CP33_V38_DF002 / EDC16CP33_V74_DF002 / EDC16CP33_V28_DF002 /
EDC16CP33_V62_DF002/ EDC16CP33_V26_DF002 / EDC16CP33_V60_DF002

13B-220
AFTER REPAIRDeal with any other faults. Clear the fault memory.
Switch off the ignition until the end of the power-latch phase, and carry out a road test
followed by a check with the diagnostic tool.
V12 MR-372-J84-13B300$074.mif
DIESEL INJECTION
Fault finding – Interpretation of faults13B
DF569
CONTINUED 2
Check for continuity and absence of interference resistance of the following connections:
●3LQ between components 120 and 1071,
●3LP between components 120 and 1071,
●3LN between components 120 and 1071.
If the connection or connections are faulty and there is a repair procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Test the high pressure fuel circuit:
Apply scenario SC035 High pressure fuel circuit fault finding.
To interpret the result, apply the interpretation of command SC035 (see Interpretation of commands).
With the engine stopped and ignition on, view parameters PR035 Atmospheric pressure and PR041
Turbocharging pressure.
If there is a difference of > 100 mbar, check that the atmospheric pressure reading is consistent (by comparison
with another vehicle for example).
If atmospheric pressure is consistent, replace the turbocharging sensor.
If not, contact the Techline.
Use the Monitool application: MT001 Turbocharging function to check the entire air line (only for Vdiag 04 and
44).
Apply Test 4 Turbocharged air inlet circuit check.
Run Test 7 Variable geometry turbocharger control.
Run Test 8 Turbocharger rotating part.
If the fault is still present, refer to the interpretation of parameter PR041 Turbocharging pressure.
If the fault is still present, contact the Techline.
EDC16CP33
Program No.: C4
Vdiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74

13B-222
AFTER REPAIRDeal with any other faults. Clear the fault memory.
Switch off the ignition until the end of the power-latch phase, and carry out a road test
followed by a check with the diagnostic tool.
V12 MR-372-J84-13B300$074.mif
DIESEL INJECTION
Fault finding – Interpretation of faults13B
DF645
CONTINUED
Check the continuity, insulation from earth and + 12 V and absence of interference resistance on the following
connections:
•3AAX between the components 120 and 1461,
•3AAY between components 120 and 1461,
•38KQ between components 120 and 1461,
•38KS between components 120 and 1461,
•38KP between components 120 and 1461.
If the connection or connections are faulty and there is a repair procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Check that the valve is not mechanically jammed (check that the valve is clean and that no component is
preventing it from closing; clean if necessary):
With the engine switched off, disconnect the air inlet hose from the damper valve.
Check that the valve is in the open position.
Start, then switch off the engine.
Check that the valve closes when the engine is switched off and then opens again when the engine has stopped.
If this does not happen, replace the damper valve.
Then run command SC036 Reinitialise programming and select Damper valve to reinitialise the valve's opening
and closing stops.
Check if the damper valve performs 3 opening/closing cycles.
Otherwise program the damper valve using command SC036 Reinitialise programming.
If the fault is still present, contact the Techline.
EDC16CP33
Program No.: C4
Vdiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74

13B-260
AFTER REPAIRDeal with any other faults. Clear the fault memory.
Switch off the ignition until the end of the power-latch phase, and carry out a road test
followed by a check with the diagnostic tool.
V12 MR-372-J84-13B300$074.mif
DIESEL INJECTION
Fault finding – Interpretation of faults13B
DF1188
CONTINUED
Apply Test 4 Turbocharged air inlet circuit check.
Apply Test 7 Variable geometry turbocharger control.
Apply Test 8 Turbocharger rotating part.
Run Test 11 Temperature upstream of turbine too low.
Check the take-off point of the turbine upstream pressure sensor
If the fault is still present, contact the Techline.
EDC16CP33
Program No.: C4
Vdiag No.: 04, 08, 20, 24,
34, 38, 44, 4C, 60, 62, 74

13B-325V12 MR-372-J84-13B300$110.mif
13B
EDC16CP33
Program No.: C4
VDiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74
OCR*: Opening Cyclic RatioTool parameter Diagnostic tool title
PR002Alternator charge (Mégane II ph2/Scénic II ph2 only)
PR005EGR valve opening setpoint
PR006Rail pressure regulator current
PR007Rail pressure regulator current setpoint
PR008Rail reference pressure
PR009Turbocharging pressure setpoint
PR015Engine torque
PR017Fuel flow
PR022EGR valve position feedback loop difference
PR023Air flow difference
PR030Accelerator pedal position
PR035Atmospheric pressure
PR037Refrigerant pressure (Mégane II ph2/Scénic II ph2 only)
PR038Rail pressure
PR041Turbocharging pressure
PR042Filtered turbocharging pressure
PR048OCR* rail pressure regulation valve
PR051EGR valve position feedback
PR053Engine speed requested by air conditioning
PR055Engine speed
PR059Inlet air temperature
PR061Exterior air temperature
PR063Fuel temperature
PR064Coolant temperature
PR074Battery voltage
PR077EGR valve position sensor voltage
DIESEL INJECTION
Fault finding – Parameter summary table

13B-339
AFTER REPAIRCarry out a road test, then check with the diagnostic tool.
V12 MR-372-J84-13B300$121.mif
DIESEL INJECTION
Fault finding – Interpretation of parameters13B
PR023DIFFERENCE IN AIR FLOW
PARAMETER
DEFINITIONThis parameter indicates the difference between the inlet air flow and the air entering
the engine in mg/st.
NOTESNone.
Conformity check: Engine stopped and ignition on, or engine running, and engine coolant
temperature > 80°C
In the event of a fault, consult the interpretation of fault DF056 Air flow sensor circuit.
EDC16CP33_V04_PR023 / EDC16CP33_V08_PR023 / EDC16CP33_V44_PR023 / EDC16CP33_V4C_PR023 / EDC16CP33_V34_PR023 /
EDC16CP33_V38_PR023 / EDC16CP33_V74_PR023 / EDC16CP33_V26_PR023 / EDC16CP33_V28_PR023 / EDC16CP33_V60_PR023 /
EDC16CP33_V62_PR023
EDC16CP33
Program No.: C4
VDiag No.: 04, 08, 26, 28,
34, 38, 44, 4C, 60, 62, 74

13B-347
AFTER REPAIRCarry out a road test, then check with the diagnostic tool.
V12 MR-372-J84-13B300$121.mif
DIESEL INJECTION
Fault finding – Interpretation of parameters13B
PR041
CONTINUED
Sensor electrical conformity
Check the continuity and absence of interference resistance of the following connections:
•3LQ between components 120 and 1071,
•3LP between components 120 and 1071,
•3LN between components 120 and 1071.
If the connection or connections are faulty and there is a repair procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Vehicle with the ignition on, and the engine stopped for at least 1 minute:
Compare the values of PR041 Turbocharging pressure and PR035 Atmospheric pressure.
If the difference between PR041 and PR035 is greater than 0.1 bar,
check the value of PR035 by comparing it with the reading on a vehicle in the workshop which is correct.
If the value of PR035 is not correct (difference greater than 0.1 bar between the 2 vehicles), contact the Techline.
Otherwise (when the value of PR035 is correct), replace the turbocharger pressure sensor.
If the difference between PR041 and PR035 is less than 0.1 bar.
Start the engine, with the engine idling:
Compare the values of PR041 and PR035.
If the difference between PR041 and PR035 is greater than 0.2 bar.
Check the air inlet circuit:
Apply Test 4 Turbocharged air inlet circuit check.
Low and high pressure air circuit sealed and not obstructed: ducts, mounting clamps present and tightened,
turbocharging pressure sensor fitted, exchanger, etc.
Check that the damper valve is not jammed closed.
Repair if necessary.
EDC16CP33
Program No.: C4
VDiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74

13B-353
AFTER REPAIRCarry out a road test, then check with the diagnostic tool.
V12 MR-372-J84-13B300$121.mif
DIESEL INJECTION
Fault finding – Interpretation of parameters13B
PR059INLET AIR TEMPERATURE
PARAMETER
DEFINITIONThis parameter indicates the air inlet temperature in °C.
NOTESThere must be no present or stored faults.
Perform this fault finding procedure:
– after finding an inconsistency in the parameter,
– after a customer complaint (e.g. lack of power).
Use the Technical Note Wiring Diagram, Laguna II ph2, Vel Satis ph2, Mégane ll
ph2, Scénic ll ph2, Espace IV ph2.
Conformity check: Engine stopped and ignition on
With the ignition on the inlet air temperature varies according to the exterior temperature.
In the event of a fault, consult the interpretation of fault DF002 Air temperature sensor circuit.
Parameter PR059 ≈ PR064 Coolant temperature engine cold.
Conformity check with the engine running and engine coolant temperature > 80°C
With the engine running at idle speed the inlet air temperature varies according to the engine coolant temperature.
In the event of a fault, refer to the interpretation of fault DF002.
EDC16CP33_V18_PR059 / EDC16CP33_V1C_PR059 / EDC16CP33_V54_PR059 / EDC16CP33_V20_PR059 / EDC16CP33_V58_PR059 /
EDC16CP33_V5C_PR059 / EDC16CP33_V24_PR059 / EDC16CP33_V04_PR059 / EDC16CP33_V08_PR059 / EDC16CP33_V44_PR059 /
EDC16CP33_V4C_PR059 / EDC16CP33_V34_PR059 / EDC16CP33_V38_PR059 / EDC16CP33_V74_PR059 / EDC16CP33_V28_PR059 /
EDC16CP33_V62_PR059 / EDC16CP33_V26_PR059 / EDC16CP33_V60_PR059
EDC16CP33
Program No.: C4
VDiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74