Page 325 of 365

13B-325
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 6 Fuel system leaks
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.
IMPORTANT
Please observe the cleanliness guidelines and safety advice.
Procedure for checking for an external leak on the fuel circuit:
Clean away traces of grease with clean thinner and wipe the part or parts concerned with cleaning cloths.
Start the engine and increase the engine coolant temperature to 80°C.
Stop the engine and check for traces of grease on the part or parts concerned.
If this is the case, replace the part or parts concerned.
Bleed the fuel circuit and continue the checks.
Does the priming bulb show traces of grease? (Visual
and tactile inspections)
(If there is a priming bulb)
NO
Does the diesel filter show traces of grease?
(Visual and tactile inspections)
NO
Do the fuel return pipes show traces of grease?
(Visual and tactile inspections)
NO
YESCheck the assembly
of the components
and the condition of
the seal at the union
of the two
components, if the
leak is at the seal.
Replace the part or
the parts concerned.
Bleed the fuel circuit
and continue the
checks.
YES
YES
AFTER REPAIRCarry out a road test followed by a complete check with the diagnostic tool.
EDC16_V50_ALP6/EDC16_V58_ALP6/EDC16_V5C_ALP6/EDC16_V18_ALP6/EDC16_V1C_ALP6/EDC16_V20_ALP6
Page 346 of 365

13B-346
MR-372-J84-13B200$900.mif
V13
DIESEL INJECTION
Fault finding – Tests
EDC16
Program No.: C1
Vdiag no.: 18, 1C, 20,
50, 58, 5C
13B
* OCR: Opening Cyclic Ratio
TEST 5 Air flowmeter
Impurities in the grilles:
Visual inspection: remove the flowmeter. There should be no foreign bodies on the grilles (see diagram 110734).
Do not clean the grilles using compressed air or any other procedure: this damages the sensors and
creates variations from the values displayed on the CLIP tool.
Check the sealing of the air circuit upstream of the air flowmeter:
disconnected or pierced pipes and air filter unit, seals present.
Replace the air flowmeter if necessary and clean upstream of this, if necessary.
Damage to electrical components:
Visual inspection:
– remove the flowmeter, the components should not be broken (see diagram no. 110736).
Replace the air flowmeter if necessary.
Oxidation of the electrical components:
Visual inspection:
– remove the air flowmeter, there must not be any green deposits on the electrical components.
Replace the air flowmeter if necessary.
Clogging of the air flowmeter:
Te s t :
– Check the values for conformity:
* During the first 5 seconds after starting:
– Coolant temperature: 80°C.
– Engine speed: at idle speed (750 rpm < PR055 < 850 rpm).
– Air flow measurement: 37 kg/h < PR132 < 57 kg/h.
– EGR valve OCR*: between - 10% and 0%.
* After the starting phase:
– Coolant temperature: 80°C,
– Engine speed: at idle speed (750 rpm < PR055 < 850 rpm).
– Air flow measurement: 25 kg/h < PR132 < 35 kg/h.
– EGR valve OCR*: between 10% and 40%.
– Refer to the interpretation of DF056 Air flow sensor circuit 2.DEF, for the air flowmeter checks.
Replace the air flowmeter if necessary.
EDC16_V50_TEST5/EDC16_V58_TEST5/EDC16_V5C_TEST5/EDC16_V18_TEST5/EDC16_V1C_TEST5/EDC16_V20_TEST5
Page 348 of 365

13B-348
MR-372-J84-13B200$900.mif
V13
EDC16
Program No.: C1
Vdiag no.: 18, 1C, 20,
50, 58, 5CDIESEL INJECTION
Fault finding – Tests13B
TEST8 Manual clearing of the soot weight
Note: In certain cases, this procedure is to be carried out only after replacement of the particle filter or after an
After-sales regeneration of the particle filter.
– Start the engine.
– Raise the engine coolant temperature.
– Read the coolant temperature with PR064 Coolant temperature until a value greater than 65ºC is obtained.
– Accelerate the engine to 4000 rpm and maintain this speed for 5 minutes.
–After 5 minutes, release the accelerator and stop the engine.
– Switch on the ignition.
– Run command SC036 Reinitialise programming and select After particle filter replacement or After
particle filter regeneration (as appropriate).
– Switch off the ignition and wait for the diagnostic tool message (maximum time 8 minutes): Communication
lost with computer: EDC16C36, check the tool connection and computer power supply.
–Then switch on the ignition again, clear the present or stored faults from the computer memory (operation
to be carried out within 3 minutes of switching on the ignition).
EDC16_V50_TEST8/EDC16_V58_TEST8/EDC16_V5C_TEST8/EDC16_V18_TEST8/EDC16_V1C_TEST8/EDC16_V20_TEST8
Page 365 of 365

13B-365
MR-372-J84-13B200$972.mif
V13
13B
DIESEL INJECTION
Fault finding – Glossary
Injection computer112-track (BOSCH)
Connectors: black A 32-track, brown B 48-track, grey C 32-track
Atmospheric pressure sensor Integrated into the computer (BOSCH)
Injector0.23 Ω at + 20°C/2 Ω max. (BOSCH)
1600 bar (1800 bar max.)
Flow regulator (high pressure
pump)R = 3 Ω at + 20°C (BOSCH, pump type CP3.2+)
Rail pressure sensor Start of opening ~ 1600 bar,
Rail pressure limiter: opening at approximately 1800 bar (BOSCH, bolted to
the rail)
Engine speed sensor510 < R< 850 Ω at + 20°C (MGI)
Camshaft sensor Hall effect sensor (ELECTRICFIL)
R = 10250 ± 500 Ω at + 20°C (measured between connections 3CQ and 3FB of
component 746)
Turbocharger control solenoid
valve15.4 ± 0.7 Ω at + 20°C (PIERBURG)
Electric EGR valve3VP: + 12 V electric motor 3JM: potentiometer earth
3GC: + 5 V potentiometer 3VQ: engine earth
Track 3: Not used 3EL: potentiometer signal
Direct current motor: R between connections VP and VQ = between 1 Ω and
400 Ω at + 20°C
Potentiometer: R between connections 3GC and 3JM: 6.5 ± 2.6 kΩ at + 20°C
(SIEMENS)
Electrical damper valve Direct current motor (VDO)
Air flowmeter3B: air temperature signal 3FB: + 12 V battery
3DW: flowmeter earth 3DV: air flow signal
3KJ: + 5 V potentiometer NT: battery earth
(SIEMENS)
Air temperature sensorR = 3714
Ω ± 161 at + 10°C/2448 Ω ± 96 at + 20°C/1671 Ω ± 59 at + 30°C
Coolant temperature sensorR = 2252 Ω ± 112 at 25°C/811 Ω ± 39 at 50°C/283 Ω ± 8 at 80°C
Accelerator pedal sensorR gang 1 = 1700 ± 900 Ω;
R gang 2 = 2,850 ± 2,050Ω
Heater plugR = 0.6 Ω at + 20°C/2 Ω max.
Maximum current drawn: 28 A at 0 seconds/12 A at 10 seconds/9 A after
30 seconds
Turbine upstream temperature
sensor2-track yellow connector (NTK)
T=400°C -> R = 1772 Ω, T=500°C -> R = 725 kΩ
Particle filter differential
pressure sensorConnection 3LQ = 5 V, connection 3TK = Earth, connection 3TL = Signal
(BOSCH)
Temperature sensor upstream
of the particle filter2-track blue connector (DENZO)
T=50°C -> R = 106 kΩ, T=100°C -> R = 33.5 kΩ
Temperature sensor
downstream of the particle filter2 track black connector (DENZO)
T=50°C -> R = 106 kΩ, T=100°C -> R = 33.5 kΩ
Water in diesel fuel sensor According to application (ZERTAN)
MR-372-J84-13B200$972.mif
EDC16
Program No: C1
Vdiag No: 18, 1C, 20,
50, 58, 5C