13B-317
MR-372-J84-13B200$792.mif
V13
13B
DIESEL INJECTION
Fault finding – Customer complaints
NOTESbefore dealing with this customer complaint, check that there are no faults, and check
the conformity (or otherwise) of the parameters and statuses using the diagnostic
tool.
if the customer complaint is not eliminated, then proceed according to the
corresponding fault finding chart.
no dialogue with engine management computer ALP 1
starting difficult or impossibleALP 2
injection noiseALP 3
poor performanceALP 4
irregular engine operationALP 5
external leaks from the fuel circuit ALP 6
rough idleALP 7
oil leaks from the turbochargerALP 8
particle filter warning light comes on too frequently ALP 9
noise from the turbochargerALP 10
smoke from the exhaustALP 11
EDC16
Program No: C1
Vdiag No: 18, 1C, 20,
50, 58, 5C
MR-372-J84-13B200$792.mif
13B-323
MR-372-J84-13B200$828.mif
V13
DIESEL INJECTION
Fault finding – Fault Finding Chart
EDC16
Program No.: C1
Vdiag no.: 18, 1C, 20,
50, 58, 5C
13B
ALP 4
CONTINUED
Check the injector operation: run test 9.
If the fault is still present
Check the conformity of the accelerator pedal position sensor, the brake pedal sensor, the atmospheric pressure
sensor, the exhaust gas recirculation valve and the damper valve.
Check the consistency of the signal: of the air flowmeter, of the engine coolant temperature sensor, of the fuel
temperature sensor and of the engine speed.
Check the connections, continuity and absence of interference resistance on the air flow sensor (run DF056 Air
flow sensor circuit, 2.DEF), the engine coolant temperature sensor (run DF001 Coolant circuit, 1.DEF), and
the engine speed (run DF195 Engine speed / camshaft sensor consistency, 2.DEF).
Check:
– That the diesel filter is not clogged (for the test, see DF053 Rail pressure regulation function 2.def).
– That there are no leaks on the high and low pressure diesel circuits, run Test 4 Turbocharged air inlet circuit
check.
– That the oil vapour rebreathing system is connected.
– The flow regulator (jammed / seized), apply the interpretation of command AC011 Rail pressure regulator.
– Check the timing setting (and the position of the high pressure pump pinion)
– Check the engine compressions (cylinder compression balance with the Compression test function on the
CLIP Technic tool).
– Measure the engine compressions with the special tool
– If the fault is still present, contact the techline.
AFTER REPAIRCarry out a road test followed by a complete check with the diagnostic tool.
13B-328
MR-372-J84-13B200$828.mif
V13
EDC16
Program No.: C1
Vdiag no.: 18, 1C, 20,
50, 58, 5CDIESEL INJECTION
Fault finding – Fault Finding Chart13B
ALP 8 Oil leaks from the turbocharger
NOTESBefore dealing with this customer complaint, check that there are no faults, and
the conformity (or otherwise) of the parameters and statuses using the
diagnostic tool.
If the customer complaint is not eliminated, perform the following checks.
Check the area around the turbocharger
Note:
An oil leak does not correspond always to a turbocharger fault, the oil leak can arise from the area around the
turbocharger.
According to the vehicle type, maximum visual access will either be from above or from below.
1- Do not start the engine.
Check the area around the turbocharger and identify the origin of the leaks.
Clean the oil traces on the turbocharger.
2- start the engine and let it warm up for several minutes.
IMPORTANT
If the air filter was removed previously, refit it before starting the engine (risks foreign matter entering the air inlet
circuit).
Accelerate with no load several times, progressively increasing the duration before releasing the accelerator
pedal.
Visually inspect the exterior condition of the fuel supply pipes and the turbocharger oil return and the area around
it.
Identify the origin of the leaks.
Is an oil leak present at the air compressor inlet or outlet?
YES NO
Check the air compressor inlet or outlet
Check for a loose interface (inlet or outlet) that is the cause of
the air leak.
Note:
it is normal to find traces of oil inside the pipes at the
turbocharger inlet or outlet as the air passing into the
compressor is laden with oil from the engine rebreathing circuit.
Is the suspected interface properly tightened?
YES
Replace the pipe concerned (see MR 364 (Mégane II), 370 (Scénic II) or 395 (Laguna II), Mechanical, 12B,
Turbocharging).
NOTighten the interface or the
concerned pipe.
End of procedure.
AFTER REPAIRCarry out a road test followed by a complete check with the diagnostic tool.
EDC16_V50_ALP8/EDC16_V58_ALP8/EDC16_V5C_ALP8/EDC16_V18_ALP8/EDC16_V1C_ALP8/EDC16_V20_ALP8
13B-329
MR-372-J84-13B200$828.mif
V13
EDC16
Program No.: C1
Vdiag no.: 18, 1C, 20,
50, 58, 5CDIESEL INJECTION
Fault finding – Fault Finding Chart13B
ALP 8
CONTINUED 1
Is an oil leak present only at the casing of the compressor section?
YES NO
The turbocharger is not faulty. The oil leak is from another engine
component and the oil is flowing onto the turbocharger.
AFTER REPAIRCarry out a road test followed by a complete check with the diagnostic tool.
13B-330
MR-372-J84-13B200$828.mif
V13
EDC16
Program No.: C1
Vdiag no.: 18, 1C, 20,
50, 58, 5CDIESEL INJECTION
Fault finding – Fault Finding Chart13B
ALP 8
CONTINUED 2
Is an oil leak present at the turbocharger oil supply inlet or outlet?
YESNO
Check the turbocharger oil supply inlet and outlet
Check for a loose interface (inlet or outlet) that is the cause of the
oil leak.
Is the suspected interface properly tightened?
YES
Replace only the seal or the pipe of the section concerned (see MR 364 (Mégane II), 370 (Scénic II) or
395 (Laguna II), Mechanical, 12B, Turbocharging).
Is an oil leak present at the interfaces of the turbine casing and the exhaust pipes?
YES NO
The turbocharger is not faulty. There is probably another fault in the engine.
Mark the component that is the source of the leak and refer to the repair manual (see MR 364 (Mégane II), 370
(Scénic II) or 395 (Laguna II), 10A Engine and peripherals).
NO
Tighten the pipe concerned.
end of the procedure
End of procedure.
AFTER REPAIRCarry out a road test followed by a complete check with the diagnostic tool.
13B-351
MR-372-J84-13B200$936.mif
V13
DIESEL INJECTION
Fault finding – Tests
EDC16
Program No: C1
Vdiag No: 18, 1C, 20,
50, 58, 5C
13B
TEST 9
CONTINUED 1
CASE No. 2: If at least one of these values is equal to or less than - 5 mg/st
– Check the valve clearance.
– Check the level and condition of the engine oil.
– Remove the injector with the largest correction.
– If there is diesel fuel contamination, check the condition of the cylinder concerned (cylinder, piston, valves).
Use an endoscope if possible.
– Only replace the removed injector, and modify the IMA code using command SC002 Enter injector codes
(see Interpretation of commands).
–Apply Part B of this test to confirm the fault finding.
CASE No. 3: If at least one of these values does not stabilise (20 seconds after starting)
– Check the low pressure circuit using Test 4 Low pressure circuit check.
– Check the conformity of the fuel by applying Test 11 Diesel fuel conformity check.
–Apply Part B of this test to confirm the fault finding procedure
CASE No. 4: If all the fuel flow correction values are correct (between - 5 mg/st and + 5 mg/st)
–Apply Part C of this test (Fuel return flow measurement).
IMPORTANT
When removing or refitting injectors, follow the cleanliness and safety instructions (see MR 364 (Mégane II), 370
(Scénic II) or 395 (Laguna II), Mechanical, 13B, Diesel injection, Diesel injector: Removal - Refitting).
13B-357
MR-372-J84-13B200$936.mif
V13
EDC16
Program No: C1
Vdiag No: 18, 1C, 20,
50, 58, 5CDIESEL INJECTION
Fault finding – Tests13B
TEST 10 Temperature upstream of turbine too low
Run full fault finding on the injection computer using the
diagnostic tool.
Are any faults present or stored?
NO
Apply Test 1 Exhaust system check.
Is the exhaust pipe in order?
YES
Apply Test 4 Turbocharged air inlet circuit check.
Is the inlet circuit in order?
YES
Apply Test 5 Air flowmeter.
Is the air flow sensor correct?
YES
Apply Test 9 Poor injector operation.
Are the injectors correct?
YES
Contact the Techline.YES
Apply the procedure for
dealing with the associated
faults (see Interpretation of
faults).
NO
Repair then carry out a
new particle filter
regeneration.
Run command SC017
Particle filter
regeneration.
If the second regeneration
is successful, it is essential
to change the engine oil
and replace the oil filter.
If the second regeneration
fails, contact the Techline.
NO
NO
NO
EDC16_V50_TEST10/EDC16_V58_TEST10/EDC16_V5C_TEST10/EDC16_V18_TEST10/EDC16_V1C_TEST10/EDC16_V20_TEST10
13B-359
MR-372-J84-13B200$936.mif
V13
DIESEL INJECTION
Fault finding – Tests
EDC16
Program No: C1
Vdiag No: 18, 1C, 20,
50, 58, 5C
13B
TEST 11
CONTINUED
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 395
(Laguna II ph 2), Mechanical, 19C, Tank, Fuel tank: Draining or MR 370
(Scénic II), Mechanical, 19C, Tank, Fuel tank draining).
Note:
If the weight measured reaches the limit values, the measurement can be performed with a 2230 ml
(part no. 77 11 171 414) plastic cup with a cover (part no. 77 11 171 417):
– Carry out a quick test drive in order to mix the fuel and then take a sample of 2 litres 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.
A
YESNO