2010 RENAULT SCENIC Engine And Pheripherals DCM 1.2 Injection Workshop Manual

13B-225V10 MR-372-J84-13B100$190.mif
DIESEL INJECTION
Fault finding – Tests13B
DCM 1.2 Injection
Program No.: 4D
Vdiag No.: 48, 4C, 50,
54, 58, 5C
TEST 12 Turbocharger
IMPORTANT
Perform these checks without removing the turbocharger and with the vehicle ignition switched off.
Checking the turbocharger shaft
WARNING
Observe the following safety precautions:
–wear high temperature protective gloves when the engine is hot,
–do not wear oversize or baggy clothing or hanging jewellery,
–watch out for possible triggering of the motor-driven cooling fan unit and the operation of the accessories belt
or belts.
Note:
The turbocharger shaft is the shaft that connects the compressor wheel and the turbine wheel.
Depending on the vehicle type, the best visual access will be either 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.
Does the shaft have a kickdown point in rotation?
Does the compressor wheel touch the casing of the turbocharger?
If for these 2
questions the
response is NOIf YES for one of these 2 questions
Replace the turbocharger (see MR 364 (Mégane II), 370 (Scénic II) 392
(Clio III), 385 (Modus), 411 (New Twingo) or 417 (Kangoo II),
Mechanical, 12B, Turbocharging, Turbocharger: Removal -
Refitting and Technical Note 3938A, Broken turbocharger:
Replacement instructions).
A
DCM1.2_V48_TEST12/DCM1.2_V4C_TEST12/DCM1.2_V50_TEST12/DCM1.2_V54_TEST12/DCM1.2_V58_TEST12/DCM1.2_V5C_TEST12

13B-226V10 MR-372-J84-13B100$190.mif
DIESEL INJECTION
Fault finding – Tests13B
DCM 1.2 Injection
Program No.: 4D
Vdiag No.: 48, 4C, 50,
54, 58, 5C
TEST 12
CONTINUED 1
Checking the condition of the turbocharger vanes.
Note:
This check is facilitated by using a mirror and a bulb.
Depending on the vehicle type, the best visual access will be either from above or from below.
Visually check that the compressor vanes are in good condition.
Are the vanes damaged or twisted?
Replace the turbocharger (see MR 364 (Mégane II), 370
(Scénic II), 392 (Clio III), 385 (Modus), 411
(New Twingo) or 417 (Kangoo II), Mechanical, 12B
turbocharging, Turbocharger: Removal - Refitting
and Technical Note 3938A, Broken turbocharger:
Replacement instructions).
Which type of turbocharger is it?
Variable geometry
turbochargerFixed geometry
turbocharger
A
NO
YES
BC

13B-227V10 MR-372-J84-13B100$190.mif
DIESEL INJECTION
Fault finding – Tests13B
DCM 1.2 Injection
Program No.: 4D
Vdiag No.: 48, 4C, 50,
54, 58, 5C
TEST 12
CONTINUED 2
Checking the turbocharging pressure regulator to determine if it is a variable geometry turbocharger
Note:
The pressure regulator rod of a variable geometry turbocharger is orthogonal to the turbocharger shaft.
Variable geometry turbochargers are controlled by a solenoid valve.
Depending on the vehicle type, the best visual access will be either 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 leaktight.
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 comes back to its initial position without jerking.
Repeat the complete sequence 3 times.
Is the pressure regulator leaktight and is the rod movement correct?
The turbocharger is correct.
End of procedure.Replace the turbocharger (see MR 364 (Mégane II), 370
(Scénic II), 392 (Clio III), 385 (Modus), 411 (New Twingo)
or 417 (Kangoo II), Mechanical, 12B turbocharging,
Turbocharger: Removal - Refitting and Technical Note
3938A, Broken turbocharger: Replacement instructions).
B
YESNO

13B-228V10 MR-372-J84-13B100$190.mif
DIESEL INJECTION
Fault finding – Tests13B
DCM 1.2 Injection
Program No.: 4D
Vdiag No.: 48, 4C, 50,
54, 58, 5C
TEST 12
CONTINUED 3
Checking the turbocharging pressure regulator to determine if it is a fixed geometry turbocharger
Note:
The pressure regulator rod of a fixed geometry turbocharger is aligned with the turbocharger shaft.
Fixed geometry turbochargers are controlled by a solenoid valve.
Depending on the vehicle type, the best visual access will be either 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 leaktight.
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 in 10 seconds.
4. Release the pressure and check that the control rod comes back to its initial position without jerking.
Repeat the complete sequence 3 times.
Is the pressure regulator leaktight and is the rod movement correct?
The turbocharger is correct.
End of procedure.Replace the turbocharger (see MR 364 (Mégane II), 370
(Scénic II), 392 (Clio III), 385 (Modus), 411 (New Twingo)
or 417 (Kangoo II), Mechanical, 12B turbocharging,
Turbocharger: Removal - Refitting and Technical Note
3938A, Broken turbocharger: Replacement instructions).
C
YESNO

13B-229V10 MR-372-J84-13B100$190.mif
DIESEL INJECTION
Fault finding – Tests13B
DCM 1.2 Injection
Program No.: 4D
Vdiag No.: 48, 4C, 50,
54, 58, 5C
Deformed, twisted blade ("soft" foreign body)
Broken blades ("hard" foreign body)
End of TEST 12
TEST 12
CONTINUED 4

13B-230V10 MR-372-J84-13B100$190.mif
DIESEL INJECTION
Fault finding – Tests13B
DCM 1.2 Injection
Program No.: 4D
Vdiag No.: 48, 4C, 50,
54, 58, 5C
TEST 13 Diesel fuel conformity check
WARNING
During this operation, it is essential to:
–refrain from smoking or bringing incandescent objects close to the work area,
–protect yourself against fuel splashes due to residual pressure in the pipes,
–wear safety goggles with side guards,
–wear leaktight gloves (Nitrile type).
IMPORTANT
–To avoid any corrosion or damage, protect the areas on which fuel is likely to run.
–To prevent impurities from entering the circuit, place protective plugs on all fuel circuit components
exposed to the open air.
Preparations:
Weigh an empty 1300 ml plastic cup (part no. 77 11 171 413) with its cover (part no. 77 11 171 416) using an
electronic scale similar to those used in body paint workshops (for example: PANDA part no. 77 11 224 995).
Record the weight of the empty cup.
This type of plastic cup is used to prepare paint.
Take a 1 l fuel sample from the diesel fuel filter outlet (see MR 364 (Mégane II) or MR 370 (Scénic II), MR 385
(Modus), MR 392 (Clio III), MR 411 (New Twingo), MR 417 (Kangoo 2), Mechanical, 19C, Tank, Fuel tank
draining), using a pneumatic transfer pump (part no. 634-200) and place it in the 1300 ml plastic cup.
Cover the plastic cup with its cover and let it settle for approximately2 minutes.
Is the fuel cloudy or does it
separate into two parts?The diesel fuel contains water and is not compliant.
Drain the fuel circuit, including the tank (see MR 364 (Mégane II)
or MR 370 (Scénic II), MR 385 (Modus), MR 392 (Clio III), MR 411
(New Twingo), MR 417 (Kangoo 2), Mechanical, 19C, Tank, Fuel
tank drain).
YES
NO
A
DCM1.2_V48_TEST13/DCM1.2_V4C_TEST13/DCM1.2_V50_TEST13/DCM1.2_V54_TEST13/DCM1.2_V58_TEST13/DCM1.2_V5C_TEST13

13B-231V10 MR-372-J84-13B100$190.mif
DIESEL INJECTION
Fault finding – Tests13B
DCM 1.2 Injection
Program No.: 4D
Vdiag No.: 48, 4C, 50,
54, 58, 5C
TEST 13
CONTINUED 1
Weigh the diesel fuel and note the fuel weight after subtracting the weight of the empty plastic cup and its cover.
Does the fuel weight fall between the minimum and maximum weights given in the table below?
Calculated weight (g.) Fuel
temperature (
°C)
Min. weight Max. weight
821 846 13
821 846 14
820 845 15
819 844 16
819 844 17
818 843 18
817 842 19
816 841 20
816 841 21
815 840 22
814 839 23
814 839 24
813 838 25
Check the fuel temperature by immersing a thermometer in the plastic cup.
End of test.The fuel is not correct.
If the fuel weight is less than the minimum value then there
is petrol in the diesel fuel.
If the fuel weight is greater than the maximum value then
there is oil in the diesel fuel.
Drain the fuel circuit, including the tank (see MR 364
(Mégane II) or MR 370 (Scénic II), MR 385 (Modus),
MR 392 (Clio III), MR 411 (New Twingo), MR 417
(Kangoo 2), Mechanical, 19C, Tank, Fuel tank drain).
A
YESNO

13B-232V10 MR-372-J84-13B100$190.mif
DIESEL INJECTION
Fault finding – Tests13B
DCM 1.2 Injection
Program No.: 4D
Vdiag No.: 48, 4C, 50,
54, 58, 5C
TEST 13
CONTINUED 2
Note:
If the weight measured hits the upper and lower limits, the measurement can be performed with a 2230 ml plastic
cup (part no. 77 11 171 414) and its cover (part no. 77 11 171 417):
–Carry out a quick test drive in order to mix the fuel, then remove 2 l of fuel.
–Perform the test again and check the results by multiplying the limit values by 2.
Contact the Techline if you have doubts or problems with the customer.