13B-17V12 MR-372-J84-13B300$030.mif
DIESEL INJECTION
Fault finding – System operation13B
EDC16CP33
Program No.: C4
Vdiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74
The potentiometer serves to control and run fault finding on the valve. The very first time the engine is started, then
each subsequent engine start, the "valve closed" position is programmed (offset). This value is compared to the very
first offset or last programmed offset, for the purposes of fault finding. It is also used to readjust the valve control
function. It is therefore important to associate the EGR valve with the computer that controls it.
Important: the EGR valve offsets must be reinitialised when replacing the valve or reprogramming/replacing
the computer.
V - Catalysed particle filter management (only for Vdiag: 18, 1C, 54, 20, 58, 5C, 24, 28 and 62).
The particle filter prevents the escape of carbon particles emitted by the engine but not yet removed from the
exhaust gases.
The particle filter is a microporous structure containing channels in order to force filter the exhaust gas.
The exhaust pipe consists of several components:
– an oxidation catalytic converter mounted after the turbocharger. This catalytic converter ensures that HC/CO levels
meet current standards by generating the heat (rise in exhaust temperature caused by catalysis) required for
particle filter regeneration,
– a catalysed particle filter located under the bodywork,
– a differential pressure sensor to tell the computer the pressure upstream and downstream of the particle filter,
– a particle filter upstream and downstream temperature sensor,
– a turbine upstream temperature sensor (TAVT).
As the vehicle is driven, the particle filter is loaded with particles (soot). Using a given weight of soot determined via
mapping in the computer, regeneration mode can be triggered if the maximum weight of soot in the particle filter is
reached and all engine operating conditions are met (coolant temperature, etc.).
Particle filter regeneration consists of burning the particles of soot accumulated in the filter.
The differential pressure sensor measures the particle filter inlet/outlet pressure differential; this measurement is
used to estimate the weight of soot present in the particle filter by mapping in the computer:
(weight of soot = pressure differential as a function of exhaust volume flow rate).
If all the criteria are met, the computer enters regeneration mode. The injection programming is then adjusted in
order to raise the target exhaust gas temperature to between 550 and 650°C.
This temperature allows the particles accumulated in the filter to be partially or completely burnt (regeneration).
Regeneration efficiency depends on the particle filter inlet temperature and the time spent in regeneration mode.
Regeneration can be performed automatically while driving if:
–the soot weight is less than the threshold for DF308 Clogged particle filter
–the number of regeneration failures while driving is less than the threshold for DF311 Failed regenerations
limit exceeded.
13B-493V12 MR-372-J84-13B300$180.mif
DIESEL INJECTION
Fault finding – Test13B
TEST1 Exhaust system check
Engine stopped: Check that the silencer outlet is
not blocked. Repair or replace the silencer, if
necessary.
Check the seal of the exhaust manifold on the
contact surface between the turbocharger and the
exhaust manifold.
Is the seal in order?Repair or replace the faulty part.
Loosen the catalytic converter on the turbocharger
side.
Place a wooden block between the two parts.
Start the vehicle and check if the engine runs
better.
Is the engine running normally?The exhaust system is not the cause of the fault;
repeat the engine fault finding (see Customer
complaints - Fault finding chart).
Retighten the catalytic converter.
Loosen or separate the particle filter on the
catalytic converter side. Place a wooden block
between the two parts if necessary.
Start the vehicle and check if the engine runs
better.
Is the engine running normally?Replace the catalytic converter.
NO
YES
NO
YES
NO
YES
A
EDC16CP33_V18_TEST1 / EDC16CP33_V1C_TEST1 / EDC16CP33_V54_TEST1 / EDC16CP33_V20_TEST1 / EDC16CP33_V58_TEST1 /
EDC16CP33_V5C_TEST1 / EDC16CP33_V24_TEST1 / EDC16CP33_V04_TEST1 / EDC16CP33_V08_TEST1 / EDC16CP33_V44_TEST1 /
EDC16CP33_V4C_TEST1 / EDC16CP33_V34_TEST1 / EDC16CP33_V38_TEST1 / EDC16CP33_V74_TEST1 / EDC16CP33_V28_TEST1 /
EDC16CP33_V62_TEST1 / EDC16CP33_V26_TEST1 / EDC16CP33_V60_TEST1
EDC16CP33
Program No.: C4
Vdiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74
