13B - 198
DIESEL INJECTION
Fault finding - Interpretation of commands13B
V10 MR-372-J84-13B150$752.mif
EDC16 INJECTION
Program No.: C1
Vdiag No: 44, 48 and 4C
* Opening Cyclic Ratio. AC004
CONTINUED
Turbocharger control circuit check (continued)
4) Turbocharging operation check:
a) Connect vacuum pump to the hoses connected to the turbocharger control diaphragm,
– Apply a vacuum pressure of 800 mbar:
If there is a leak, replace the turbocharger (diaphragm included).
b) Check the movement of the control rod (See MR 364, 12B, Mechanical, Turbocharging).
If the control rod is sticking, replace the turbocharger.
c) Engine cold and switched off:
– Remove the turbocharger inlet duct and check that the compressor turns freely on the axis.
d) If the fault is still present:
– Check that the exhaust manifold is not leaking.
– Check that the exhaust is not blocked.
Carry out the necessary repairs.
5) Computer output check (solenoid valve connected):
This operation can only be carried out if the checks indicated in step no. 2 are not conclusive.
Using a voltmeter:
– Connect the voltmeter earth to track 2 of the solenoid valve and the positive cable to track 1.
– Clear any solenoid valve fault then run command AC004:
The voltmeter should display ten cycles of two successive voltages ~ =battery voltage X OCR* current.
either: ~2.5V (OCR for 20 %) then ~8.7V (OCR for 70 %).
Or using an oscilloscope (range 5 V/division and with time base 1 ms/division):
– Connect the earth of the oscilloscope to the battery earth and the positive test pin to track 2 of the solenoid valve.
– Clear any solenoid valve faults, then run command AC004:
the oscilloscope should display a square wave signal of 12.5 V in amplitude at a frequency of 140 Hz
(with an OCR alternating from ~ 20 to ~ 70 %).
– If the measurement is correct, replace the solenoid valve.
– If the measurement does not show any control or continuous voltage, contact the Techline.
AFTER REPAIRRestart the conformity check from the beginning.
13B-205
MR-372-J84-13B150$846.mif
V10
DIESEL INJECTION
Fault finding - Fault finding chart13B
ALP 2Starting faults
(or starting impossible)
NOTESBefore dealing with this customer complaint, check that there are no faults,
and he conformity (or otherwise) of the parameters and statuses using the
diagnostic tool.
If the customer complaint is not eliminated, perform the following checks.
Is starting difficult or impossible?
difficult
Check the engine earths.
Make sure that the engine speed reaches 250 rpm when the starter motor is operated, displayed in
the parameter screen.
Ensure that the correct fuel is being used. Run test 5 Diesel fuel conformity check.
Check the conformity of the fuel filter connections.
Ensure that the fuel filter is not saturated with water.
Check there are no air bubbles between the filter and the high pressure pump.
Check the operation of the preheating unit and heater plugs with command AC001 Preheating unit.
Check the condition of the air filter (clogging).
Check the seal of the high-pressure diesel circuit, pump, pipes, unions (visual checks + odours).
Check the position of the EGR valve: jamming or mechanical seizure.
Check the consistency of the signal from the engine coolant temperature sensor.
Check that the pressure regulator is working correctly (see the interpretation of command AC011 Rail
pressure regulator).
Check the operation of the injectors (too much return leakage, clogging, seizing) referring to Component
test, Test 1 Injector Test.
Check the compression balance, according to current consumption during the starting phase
(Compression test menu on the Clip tool).
In the event of imbalance, use a compression gauge to refine the reading (see the procedure in the Workshop
Repair Manual). After the operation, clear the faults caused by disconnecting the regulator and the heater
plugs.
impossible
AFTER REPAIRCarry out a road test followed by a complete check with the diagnostic tool.
EDC16_V44_ALP2 / EDC16_V48_ALP2 / EDC16_V4C_ALP2
EDC16 INJECTION
Program No.: C1
Vdiag No: 44, 48 and 4C
