Mazda CX-5 2.2 SkyActiv-D - DPF filling fast

[spektr]

Well, I have learned that PM_ACC_DSD is more important, i mean it show some future problems earlier. In manual the description for this PID is - PM Acumulation Desired. On my previous car, i had a configuration like yours, but it wasnt so good, because i didnt see that engine is suffering from ( I assume) blocked DPF and almost completely blocked EGR and connected pipes.

What kind of journeys do you perform with your car? Do you mostly ddrive on a highway, city? Are you gentle with your gas pedal or not?

[youyoukulude]

There are two kinds of regeneration: passive regeneration  active regeneration



Passive regeneration:

In DPF, nitrogen dioxide interacts with carbon particles to form carbon monoxide  nitric oxide, and the carbon particles are removed. No in the waste gas is oxidized by doc to NO2, NO2 + C = no + CO, no + o = NO2, and the exhaust temperature is between 230 ℃ and 450 ℃. This kind of reaction usually occurs when  speed  load occurs in the engine, so sometimes customers are required to drive at  speed  to help the vehicle regenerate. Passive regeneration can remove  particles in DPF, avoid increasing  fuel consumption in active regeneration, and help to save fuel.



Active regeneration:

When the engine exhaust temperature rises to 600 ℃, the carbon particles can be completely oxidized to carbon dioxide. However, it is usually possible to reach such a temperature under urban traffic conditions. This causes diesel particles to deposit in the DPF. In order to consume these deposited diesel particles in combustion, active regeneration must be started under the intervention of engine control system and at a specified time interval.



Principle of DPF regeneration

Step 1: the engine calibrates and controls the rear injection of the engine oil nozzle, the shut-off valve is closed to a certain angle, and the EGR valve is opened, and the engine exhaust temperature  rises

Step 2: when the temperature sensor installed in front of DPF measures that the exhaust temperature reaches 230 ℃, the engine exhaust pipe evaporator works, the evaporator is heated, the  oil pump in the oil pipe circuit is started, the fuel vapor is oxidized by the  Dec in front of DPF to generate  temperature, and the exhaust temperature is continuously controlled at 620 ° left  which is the start of combustion of  carbon particles in DPF.



Regeneration conditions:

The system will regenerate actively under the following conditions:



1. Generally once every 300-600km



2. Carbon particle value (closed-loop control)



3. Ambient temperature - 30 ℃ - 40 ℃, altitude below 4500m



4. Heat engine (water temperature 50 )



5. Vehicle in running state



Restrictions:

1. Regeneration temperature is too high (water temperature is over 105)

2. Related faults:

#Throttle failure, EGR failure, intake pressure failure, air flow failure

#Differential pressure sensor failure, exhaust temperature, DPF loss

#Low oil level, shift signal detected, brake pedal depressed, clutch pedal depressed, accelerator pedal depressed, vehicle speed detected. It is recommended to check whether the fault exists before regeneration.



Manual regeneration: IDS performs powertrain > service functions > PCM > diesel particulate filter static regeneration

[youyoukulude]

Relevant fault code:

DPF:

P242f DPF needs to be replaced

P246b particle catcher overload (running speed condition required)

P2463 particle trapper severely overloaded (service regeneration required)

P2002 particle trap removal



Differential pressure sensor (DPS):

P2455 p2454 differential pressure sensor  way

P2453 differential pressure sensor reading too  (possible open circuit)

P244a sensor reading too low (0)



Temperature sensor (EGTs):

P0546-00 egts1  potential  circuit

P0545-00 egts1 low potential  circuit

P0544-2f egts1 error

P2080-00 egts1 temperature too high during cold start (possibly open circuit)

P2033-00 egts2  potential  circuit

P2032-00 egts2 low potential  circuit

P2031-2f egts2 error

P2084-00 egts2 temperature too high during cold start (open circuit possible)

P244d-00 overheated exhaust temperature



Evaporator:

P269e evaporator to battery  way

P269d evaporator to ground  way

P20cd evaporator oil pump to ground  way

P20ce evaporator oil pump to battery  way

P269f glow plug open circuit

P244c evaporator function failure



Throttle valve ETP (intake throttle):

P02e9-17  potential  circuit

P02e8-16 low potential  circuit

P02ea-2f over open (possibly open circuit)

P02e4-73 the maximum opening is lower than the limit value

P02e5-72 maximum opening exceeds the limit value

[Totoribus]

hello spektre hello youyoukulude.

Zero fault code can be found in the ecu

Please find hereunder a regeneration process with dpf acc dsd of my cx-5, for remind the DPF and dpf sensors are brand new but the problem occur again (short regen intervall, here 67 km)

The odb buetooth freeze somestimes but you get the idea.

https://www.youtube.com/watch?v=8WoRUVOxsYk


it will very helpfull if you have an idea....

Regards

Totoribus from Martinique FWI

[spektr]

Keep an eye on that three DPF_ parameters when regeneration will not be in progress. I thnink, that DSD will increase much more than ACC or GEN. ACC will sinhronyze with DSD from time to time, so when ACC will be around 6 regeneration takes place.

If everything is normal, regeneration would be triggered on GEN parameter, when value is around 6.

So, one member of this forum told me, that he was doing some cleaning of DPF filter, and result was perfect again.

You, could try the simplies soultions first, for example:
- injector calibration
- EGR cleaning and EGR pipes
- MAS cleaning
- maybe there is some other things you can do

I had the same problems with my previous mazda 6, but i sold it then, however i had tried a various things , but the behaviour did not change much. So, I assume that there could really be problem with DPF filter itself. I had around 10km drives from home to work, but i was regulary keeping an eye on when regeneration will take place, and almost every time I drove to complete it. SO i was really surprised why that would happen at all.
Maybe i was too gentle on gas, i think it is good for your engine to rev it up, or push it hard for a few seconds, to clear it from inside


Keep us updated , what will you discover.

[Totoribus]

Hello all, and thanks spektr

I confirm that DPF PM ACC DSD is very close or equal to DPF PM ACC all time, during regeneration or not .

-Injector have been checked by the mechanics, but can i found corrections values with ODB torque pro ?
-EGR have been cleaned/checked by the mechanics
-I have cleaned the MAS sensor myself, but after all theses checks and works, i'ts possibly guilty (bad contact or slilghtly false value as we didn't get a default code)
Strange fact : i've unplugged the MAS sensor and run the car for 5 minutes in order to see what happen, i've got the christmas tree on my dashboard, but after pluggin back the sensor, the engine was great with a low consumption and a slow dpf filling during twentish kilometers, but came back quickly in trouble as now.


-The DPF is brand new, OEM and IMO can not be considered as guilty anymore.

any other idea are welcome

Regards

[spektr]

1. Did you have this problem before you unplug MAF sensor or not?
2. About DPF, which part is new, the DPF insert or complete new DPF with all the sensors around it?

[Totoribus]

Hello spektr,

- Did you have this problem before you unplug MAF sensor or not?
Yes of course, the problem is there since two years, I've unplugged the MAF sensor last week.

- About DPF, which part is new, the DPF insert or complete new DPF with all the sensors around it?
The complete DPF have been changed, first they have changed three sensors (i assume two temp and the differential pressure), then they have changed the complete DPF.

I can't find the correction value on my diesel injectors with torque pro, as i'm not really confident in the mazda mechanics here, it's maybe a way to be checked.

Another strange value is the MAF value compared with the gas pedal: when the gas pedal is open around 10 %, the MAF value is lower than when the gas pedal is closed (0%) that doesn't sound realistic but i'm not an expert, i'll take a video.

it's so sad that the two others peoples concerned popielasty and Aldrich doesnt reply anymore

[spektr]

I was in contact with him on mazda Poland forum. But, however, so you have a new DPF so there shouldn't be a problem.

When they change it, i hope that they did everything by protocol, i mean to learn the PCM for new values and so? You could try PCM re-flash if that would help, but this can be done more or less in Mazda shop.

Popielsty said, that he blind EGR, and there was some improvement. Then he did DPF cleaning, and results were even better. Final thing was to replace injector washers, which is common problem on Mazdas. Did you consider about that?

[Totoribus]

Are you sure that changing the dpf need also to clear the engine calculator ?


The EGR have been checked and the car still doesn't regenerate as it shall be, blocking the EGR is outlaw and can be found ont the annual check (TUV) blocking the EGR will be done in last solution.

Interesting to heard about theses washers, can you explain how the injectors washer (i suppose the bottom seal) can create a fast filling of the dpf ?


edit: i've just read the popielsty report, injectors washers can be the cause aof the issue , even at 50 000km.

many thanks

Regards