2010 RENAULT SCENIC Engine And Pheripherals DCM 1.2 Injection Workshop Manual

13B-233V10 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 14 Accelerator pedal check
Can the accelerator pedal be fully
depressed and does it return fully?Check that there are no obstructions between the floor
and the accelerator pedal, and check that the latter has no
points of resistance.
Vehicle under + after ignition feed.
Measure the voltage between
connections 3LR and 3LT of
component 921.Check the continuity and insulation of connections 3LR
and 3LT between components 921 and 120.
If the connection is faulty and there is a repair method
(see Technical Note 6015A, Repairing electrical wiring,
Wiring: Precautions for repair), repair the wiring,
otherwise replace it. Expected result:
4.75 V < X < 5.25 V
Vehicle under + after ignition feed.
Fully depress the accelerator pedal
and measure the voltage between
connections 3LS and 3LT of
component 921.Check the continuity and insulation of connection 3LS
between components 921 and 120.
If the connection is faulty and there is a repair method
(see Technical Note 6015A, Repairing electrical wiring,
Wiring: Precautions for repair), repair the wiring,
otherwise replace it.
If these checks are correct, replace the accelerator pedal
sensor (see MR 392 (Clio III), MR 364 (Mégane II), MR 370
(Scénic II), MR 417 (Kangoo 2), Mechanical, 37A,
Mechanical component controls, Accelerator pedal:
Removal – Refitting) or (see MR 385 (Modus), MR 411
(New Twingo), Mechanical, 37A, Mechanical
component controls, Accelerator brake pedal
assembly: Removal – Refitting). Expected result:
3.94 < X < 4.56 V
Vehicle under + after ignition feed.
Accelerator pedal in no load position,
measure the voltage between
connections 3LS and 3LT of
component 921.Replace the accelerator pedal sensor (see MR 392
(Clio III), MR 364 (Mégane II), MR 370 (Scénic II), MR 417
(Kangoo 2), Mechanical, 37A, Mechanical component
controls, Accelerator pedal: Removal – Refitting)
or (see MR 385 (Modus), MR 411 (New Twingo),
Mechanical, 37A, Mechanical component controls,
Accelerator brake pedal assembly: Removal –
Refitting). Expected result:
0.66 V < X < 0.84 VNO
YES
NO
YES
NO
YES
NO
YES
A
DCM1.2_V48_TEST14/DCM1.2_V4C_TEST14/DCM1.2_V50_TEST14/DCM1.2_V54_TEST14/DCM1.2_V58_TEST14/DCM1.2_V5C_TEST14

13B-234V10 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 14
CONTINUED
Vehicle under + after ignition feed.
Measure the voltage between
connections 3LU and 3LV of
component 921.Check the continuity and insulation of connections 3LU
and 3LV between components 921 and 120.
If the connection is faulty and there is a repair method
(see Technical Note 6015A, Repairing electrical wiring,
Wiring: Precautions for repair), repair the wiring,
otherwise replace it. Expected result:
4.75 V < X < 5.25 V
Vehicle under + after ignition feed. Fully
depress the accelerator pedal
and measure the voltage between
connections 3LW and 3LV of
component 921.Check the continuity and insulation of connection 3LW
between components 921 and 120.
If the connection is faulty and there is a repair method
(see Technical Note 6015A, Repairing electrical wiring,
Wiring: Precautions for repair), repair the wiring,
otherwise replace it.
If these checks are correct, replace the accelerator pedal
sensor (see MR 392 (Clio III), MR 364 (Mégane II), MR 370
(Scénic II), MR 417 (Kangoo 2), Mechanical, 37A,
Mechanical component controls, Accelerator pedal:
Removal – Refitting) or (see MR 385 (Modus), MR 411
(New Twingo), Mechanical, 37A, Mechanical component
controls, Accelerator brake pedal assembly: Removal –
Refitting). Expected result:
2.16 < X < 2.38 V
Vehicle under + after ignition feed.
Accelerator pedal in no load position,
measure the voltage between
connections 3LW and 3LV of
component 921.Replace the accelerator pedal sensor (see MR 392
(Clio III), MR 364 (Mégane II), MR 370 (Scénic II), MR 417
(Kangoo 2), Mechanical, 37A, Mechanical component
controls, Accelerator pedal: Removal – Refitting) or
(see MR 385 (Modus), MR 411 (New Twingo),
Mechanical, 37A, Mechanical component controls,
Accelerator brake pedal assembly: Removal –
Refitting). Expected result:
0.32 < X < 0.42 V
Contact the Techline
A
NO
YES
NO
YES
NO
YES

13B-235V10 MR-372-J84-13B100$200.mif
13B
DCM 1.2 Injection
Program No.: 4D
Vdiag No.: 48, 4C, 50,
54, 58, 5C
NOTESSpecial note:
Only consult this customer complaint after a full check with the diagnostic tool.
No dialogue with the computer ALP1
Starting fault:
The engine will not start ALP2
The engine starts with difficulty, or starts then stalls ALP3
Starting difficult with warm engine ALP4
Rough idle (pumping) ALP5
Idling speed too high or too low ALP6
Behaviour while driving:
Erratic acceleration/deceleration and engine racing ALP7
Acceleration gap ALP8
Engine cut-out (stalling) ALP9
Engine bucking ALP10
Loss of power ALP11
Too much power ALP12
Excessive consumption ALP13
Overspeed when releasing accelerator or changing gear ALP14
Engine dies on pulling away ALP15
Noise, odours or smoke:
Knocking engine, noisy engine, noise from the turbocharger ALP16
Blue, white or black smoke ALP17
Oil leaks from the turbocharger ALP18
DIESEL INJECTION
Fault finding – Customer complaints

13B-236V10 MR-372-J84-13B100$210.mif
13B
DCM 1.2 Injection
Program No.: 4D
Vdiag No.: 48, 4C, 50,
54, 58, 5C
ALP1 No dialogue with the computer
NOTESOnly consult this customer complaint after a complete check with the diagnostic tool.
To check that the diagnostic tool is not causing the fault, try to establish dialogue with a computer on another
vehicle. If the diagnostic tool is not the cause and communication cannot be established with any other computer
on the same vehicle, it is possible that another computer is disrupting the multiplex network. Check the battery
voltage and make the necessary adjustments to obtain a correct voltage (9.5 V < Battery voltage < 17.5 V).
Run fault finding on the multiplex network using the diagnostic tool (see 88B, Multiplexing).
Check the presence and the condition of the injection fuses on the UPC and on the engine fuse box.
Check the connection of the computer connectors and the condition of its connections.
Check the injection computer earths (quality, oxidation, earth bolts secure on the battery terminal).
Check that the supply to the computer is correct:
For New Twingo:
–AP29 between components 1016 and 120,
–3FB between components 238 and 120,
–NH between earth and component 120,
For Mégane II, Scénic II, Modus, and Clio III:
–AP15 between components 1337 and 120,
–NH between earth and component 120,
–3FB1 between components 1337 and 120,
–3FB2 between components 1337 and 120.
For Kangoo 2:
–AP15 between components 1337 and 120,
–N between earth and component 120,
–3FB between components 1337 and 120,
–3FB1 between components 1337 and 120,
–3FB2 between components 1337 and 120.
Ensure that the supply to the diagnostic socket is correct:
–BP32 between components 225 and 260,
–AP43 between components 225 and 1337,
–MN between earth and component 225.
If dialogue has still not been established after these checks, contact Techline.
DCM1.2_V48_ALP1/DCM1.2_V4C_ALP1/DCM1.2_V50_ALP1/DCM1.2_V54_ALP1/DCM1.2_V58_ALP1/DCM1.2_V5C_ALP1
DIESEL INJECTION
Fault finding – Fault finding charts

13B-237V10 MR-372-J84-13B100$210.mif
DIESEL INJECTION
Fault finding – Fault finding charts13B
DCM 1.2 Injection
Program No.: 4D
Vdiag No.: 48, 4C, 50,
54, 58, 5C
ALP2 The engine will not start
NOTESOnly consult this customer complaint after a complete check with the diagnostic tool.
Check that the fuel tank is correctly filled and that the fuel is correct: run TEST 13 Diesel fuel conformity check.
Check the levels of engine oil and coolant.
Check the air inlet circuit: run TEST 5 Air inlet circuit check.

Is the catalytic converter clogged or damaged?Replace the catalytic converter (see MR
364 (Mégane II), MR 370 (Scénic II),
MR 385 (Modus), MR 392 (Clio III), MR
411 (New Twingo), MR 417 (Kangoo 2),
Mechanical, 19B, Exhaust, Catalytic
converter: Removal - Refitting).
Check the electrical circuit: run TEST 2 Electrical circuit check.
Check the electrical conformity of the heater plugs (the resistance value of the heater plug must be less
than 2 Ω).

Is the timing set correctly? Carry out the necessary repairs.
Visually check the condition of the engine wiring harness.
YES
NO
NO
YES
A
DCM1.2_V48_ALP2/DCM1.2_V4C_ALP2/DCM1.2_V50_ALP2/DCM1.2_V54_ALP2/DCM1.2_V58_ALP2/DCM1.2_V5C_ALP2

13B-238V10 MR-372-J84-13B100$210.mif
DIESEL INJECTION
Fault finding – Fault finding charts13B
DCM 1.2 Injection
Program No.: 4D
Vdiag No.: 48, 4C, 50,
54, 58, 5C
ALP2
CONTINUED 1
Does the starter motor operate correctly
(minimum engine speed = 200 rpm)?Carry out the necessary repairs
Is the compression in order? Carry out the necessary repairs
Using the diagnostic tool, check that the injector codes (C2I) are correctly entered on the identification screen.
If not, configure the correct injector codes using command SC002 Enter injector codes.

Is PR038 Rail pressure less than 50 bar under
+ after ignition feed?Apply the fault finding procedure for DF007 Rail
pressure sensor circuit.
Check the low pressure circuit: run TEST 1 Low pressure circuit check.
Check the injectors: run TEST 3 Injector check.
A
NO
YES
NO
YES
YES
NO
B

13B-239V10 MR-372-J84-13B100$210.mif
DIESEL INJECTION
Fault finding – Fault finding charts13B
DCM 1.2 Injection
Program No.: 4D
Vdiag No.: 48, 4C, 50,
54, 58, 5C
ALP2
CONTINUED 2
Visually check that there are no leaks on the high pressure circuit: run TEST 7 High pressure circuit sealing
check.
Check the high pressure system: run TEST 6 High pressure system check.
Check the computer:
Check that the computer connectors are properly locked.
Check the condition of the computer connections (bent pin, signs of corrosion, silicone, etc.).
If the connector(s) is faulty and if there is a repair procedure (see Technical Note 6015A, Repairing electrical
wiring, Wiring: Precautions for repair), repair the connector, otherwise replace the wiring.
Contact the Techline if the customer complaint is still present.
B

13B-240V10 MR-372-J84-13B100$210.mif
DIESEL INJECTION
Fault finding – Fault finding charts13B
DCM 1.2 Injection
Program No.: 4D
Vdiag No.: 48, 4C, 50,
54, 58, 5C
ALP3 The engine starts with difficulty, or starts then stalls
NOTESOnly consult this customer complaint after a complete check with the diagnostic tool.
Check that the fuel tank is correctly filled and that the fuel is correct: run TEST 13 Diesel fuel conformity check.
Check the levels of engine oil and coolant.
Check the air inlet circuit: run test 5 Air inlet circuit check.
Is the catalytic converter clogged or damaged?Replace the catalytic converter (see MR 364
(Mégane II), MR 370 (Scénic II), MR 385
(Modus), MR 392 (Clio III), MR 411
(New Twingo), MR 417 (Kangoo 2),
Mechanical, 19B, Exhaust, Catalytic
converter: Removal - Refitting).
Check the electrical conformity of the heater plugs (the resistance value of the heater plug must be less
than 2 Ω).
Is the timing set correctly? Carry out the necessary repairs.
Is the compression in order? Carry out the necessary repairs.
Visually check the condition of the engine wiring harness.
YES
NO
NO
YES
NO
YES
A
DCM1.2_V48_ALP3/DCM1.2_V4C_ALP3/DCM1.2_V50_ALP3/DCM1.2_V54_ALP3/DCM1.2_V58_ALP3/DCM1.2_V5C_ALP3