2009 RENAULT SCENIC Engine And Peripherals EDC16 Workshop Manual

DIESEL INJECTION
Fault finding – Test13B
13B -249V3 MR-372-J84-13B250$900.mif
EDC16
PROGRAM No.: C1
Vdiag No.: 51
TEST5
CONTINUED 1
Reconnect the vacuum pipe to the turbocharging pressure regulator
Check the vacuum at the solenoid valve outlet
Let the engine idle.
Disconnect the vacuum pipe from the solenoid valve outlet end piece.
This pipe connects the solenoid valve to the turbocharging pressure regulator.
Connect a vacuum pressure gauge to the solenoid valve outlet and put it in the vacuum measurement position.
Accelerate rapidly by fully depressing the accelerator pedal and releasing it immediately.
The total duration of pressing and holding in the full load position must not exceed 1 second.
During this acceleration, the engine speed must reach a value between 3000 and 4000 rpm.
Repeat the operation three times.
Read the maximum vacuum displayed by the pressure gauge during the increase in speed, the decrease in speed
and after returning to idle speed.
Tolerance intervals to be respected for the vacuum value:
-1 bar < CORRECT vacuum value < - 0.6 bar
-0.6 bar < INCORRECT vacuum value < 0 bar
Does the vacuum displayed at the solenoid valve outlet, by the pressure gauge respect the tolerance
interval?
NO YES
Reconnect the vacuum pipe to the turbocharging
pressure regulator Replace the vacuum pipe between the solenoid
valve and the turbocharger pressure regulator
(see MR 364 (Mégane II) or 370 (Scénic II),
Mechanical, 12B, Turbocharging).
1

DIESEL INJECTION
Fault finding – Test13B
13B -250V3 MR-372-J84-13B250$900.mif
EDC16
PROGRAM No.: C1
Vdiag No.: 51
TEST5
CONTINUED 2
Visual inspection of the solenoid valve electrical connector
Switch off the engine.
Note:
The requested checks are entirely visual.
1- Check that the connector is correctly connected and locked.
2- Check that the electric wires are not damaged where they leave the insulation.
Disconnect the connector to continue the checks.
3- Check that there is no heat damage to the unit and mechanical damage to the lock.
4- Check that the contacts (clips and tabs) are not deformed.
5- Check the sealing of the connector.
Do the visual inspections highlight any damage?
NO YES
If there is a repair procedure (see Technical
Note 6015A, Electrical wiring repair, Wiring:
Precautions for repair), repair the connector,
otherwise replace the wiring.
After repair, restart the test from the beginning.
C
1

DIESEL INJECTION
Fault finding – Test13B
13B -251V3 MR-372-J84-13B250$900.mif
EDC16
PROGRAM No.: C1
Vdiag No.: 51
TEST5
CONTINUED 3
Check the vacuum at the solenoid valve inlet
Let the engine idle.
Disconnect the vacuum pipe from the solenoid valve inlet end piece.
This pipe connects the vacuum pump to the turbocharger solenoid valve.
Connect a vacuum pressure gauge to the end of the disconnected pipe and put it in the vacuum
measurement position.
Read the vacuum displayed by the pressure gauge.
Tolerance intervals to be respected for the vacuum value:
-1 bar < CORRECT vacuum value < -0.85 bar
-0.85 bar < INCORRECT vacuum value < 0 bar
Does the vacuum displayed at the solenoid valve inlet by the pressure gauge respect the tolerance
interval?
NO YES
Replace the solenoid valve (see MR 364 (Mégane
II) or 370 (Scénic II), Mechanical, 12B,
Turbocharging).
Carry out the following operations.
–reconnect the vacuum pipe to the turbocharger solenoid valve.
–Check the vacuum pipe or pipes are connected correctly.
–visually inspect the condition of the vacuum pipes from the vacuum pump to the various components supplied.
Refer to the repair manual (see MR 364 (Mégane II) or 370 (Scénic II), Mechanical, 12B Turbocharging).
C
1

DIESEL INJECTION
Fault finding – Test13B
13B -252V3 MR-372-J84-13B250$900.mif
EDC16
PROGRAM No.: C1
Vdiag No.: 51
TEST6 Turbocharger
IMPORTANT
Perform these checks without removing the turbocharger and with the vehicle ignition switched off.
Check the turbocharger shaft
WARNING
Respect the following safety precautions:
–wear heat resistant gloves when the engine is hot,
–do not wear loose or baggy clothing and do not wear loose hanging jewellery,
–be aware that the cooling fan assembly may be triggered and pay attention to the operation of the accessories
belt or belts.
Note:
The turbocharger shaft is the shaft connecting the compressor wheel and the turbine wheel.
According to the vehicle type, maximum visual access will either be from above or from below.
Disconnect the air pipe located between the turbocharger and the air filter.
Wearing gloves, check the operation of the turbocharger shaft by turning the vanes manually without forcing.
Is there a point of resistance when the shaft is rotated?
Does the compressor wheel touch the turbocharger housing?
If for these 2 questions the response is NOIf YES for one of these 2 questions
Replace the turbocharger (see MR 364 (Mégane II) or
370 (Scénic II), Mechanical, 12B, Turbocharging,
Turbocharger: Removal - Refitting and Technical
Note 3938A, Broken turbocharger: Replacement
instructions).
EDC16_V51_TEST6

DIESEL INJECTION
Fault finding – Test13B
13B -253V3 MR-372-J84-13B250$900.mif
EDC16
PROGRAM No.: C1
Vdiag No.: 51
TEST6
CONTINUED 1
Check the condition of the turbocharger vanes
Note:
Use a mirror and light to facilitate this check.
According to the vehicle type, maximum visual access will either be from above or from below.
Visually check that the compressor vanes are in good condition.
Are the vanes damaged or twisted?
NO YES
Replace the turbocharger (see MR 364 (Mégane II)
or 370 (Scénic II), Mechanical, 12B,
Turbocharging, Turbocharger: Removal -
Refitting and Technical Note 3938A, Broken
turbocharger: Replacement instructions).
What is the type of turbocharger?
Variable geometry
turbochargerTurbocharger with
fixed geometry

DIESEL INJECTION
Fault finding – Test13B
13B -254V3 MR-372-J84-13B250$900.mif
EDC16
PROGRAM No.: C1
Vdiag No.: 51
TEST6
CONTINUED 2
Checking the turbocharging pressure regulator for a turbocharger with variable geometry
Note:
The rod of the pressure regulator on a turbocharger with variable geometry is perpendicular to the turbocharger
shaft.
Turbochargers with variable geometry are controlled by a solenoid valve.
According to the vehicle type, maximum visual access will either be from above or from below.
Note:
If necessary, according to the vehicle type and the accessibility of the pressure regulator, connect the vacuum
pump to the end of the pressure regulator pipe at the solenoid valve outlet.
Using a manual vacuum pump, apply a vacuum on the turbocharging pressure regulator of approximately
650 mbar.
1- Check that the fitting is completely sealed.
2- Check that the control rod is resting against its stop.
3- Lock the vacuum device and check that the pressure variation is not greater than 100 mbar in 10 seconds.
4- Release the pressure and check that the control rod returns to its initial position without jerking.
Repeat the entire sequence three times.
Is the pressure regulator sealing and rod movement correct?
YES NO
The turbocharger is correct.
End of procedure.Replace the turbocharger (see MR 364 (Mégane II)
or 370 (Scénic II), Mechanical, 12B,
Turbocharging, Turbocharger: Removal -
Refitting and Technical Note 3938A, Broken
turbocharger: Replacement instructions).

DIESEL INJECTION
Fault finding – Test13B
13B -255V3 MR-372-J84-13B250$900.mif
EDC16
PROGRAM No.: C1
Vdiag No.: 51
TEST6
CONTINUED 3
Checking the turbocharging pressure regulator for a turbocharger with fixed geometry
Note:
The pressure regulator rod for a turbocharger with fixed geometry is line with the turbocharger shaft.
Turbochargers with fixed, regulated geometry are controlled by a solenoid valve.
According to the vehicle type, maximum visual access will either be from above or from below.
Note:
If necessary, according to the vehicle type and the accessibility of the pressure regulator, connect the vacuum
pump to the end of the pressure regulator pipe at the solenoid valve outlet.
Using a manual vacuum pump, apply a vacuum on the turbocharging pressure regulator of approximately
650 mbar.
1- Check that the fitting is correctly sealed.
2- Check that the control rod moved several millimetres.
3- Lock the vacuum device and check that the pressure variation is not greater than 100 mbar over 10 seconds.
4- Release the pressure and check that the control rod returns to its initial position without jerking.
Repeat the entire sequence three times.
Is the pressure regulator sealing and rod movement correct?
YES NO
The turbocharger is correct.
End of procedure.Replace the turbocharger (see MR 364 (Mégane II)
or 370 (Scénic II), Mechanical, 12B,
Turbocharging, Turbocharger: Removal -
Refitting and Technical Note 3938A, Broken
turbocharger: Replacement instructions).

DIESEL INJECTION
Fault finding – Test13B
13B -256V3 MR-372-J84-13B250$900.mif
EDC16
PROGRAM No.: C1
Vdiag No.: 51
Deformed, twisted blade (“soft” foreign body)
Broken blades (“hard” foreign body)
TEST6
CONTINUED 4