Hello,

today I have put my ASX on ECU reader, because I had the feeling that active regeneration is happening too often. They said the car seems fine and they printed out the values from my last DPF regeneration. I don't understand what distance1 and distance2 tell:

Regeneration start distance1: 270 km
Regeneration start distance2: 530 km

If anyone can explain these two values with simple words, I would very much appreciate it.

Thanks !

 

These are the distances since your last regeneration. They are very low..So this tells me something is not right. On a well running car these figure are up near to 1000km each. 750 km is the expected average.

How is your oil level? Above the normal full mark near the X?

What kind of journeys are you doing?

In the data did they give you anything on average speeds during regeneration?

 

This is all they gave me. Oil is not near X mark, but it is a little above the max, so this is still ok. I am making aprox. 60 km per day, that is 30 km to each direction.
The snapshot they gave me is:

Max value of DPF temperature: 710 °C
Regeneration start distance1: 270 km
Regeneration summation: 9,30 g/L
Regeneration star press diff: 6,30 g/L
Regeneration start distance2: 530 km
DPF temperature: 110 °C

And they also said that they checked current fullness of filter and it ok. Car has aprox 122 000 kilometers.

But can you tell me what specifically distance1 and distance2 mean ? That is what I would like to clear out.

BTW. engine goes to that different note (which I though it was regeneration) each 200 - 250 km for aprox. 5 minutes. First few second when note changes, you can see some smoke coming from exhaust and during those 5 minutes, the fuel consumption goes up. So that's why I am trying to find out what does distances are telling me, because none of them matches 200 or 250 kilometers.

 

These 2 data items are the distance that your car has travelled since your last 2 regeneration

 

So that means - 530 km is distance between last two regenerations and 270 km is made since last regeneration ?

 

Distance 1 is a distance based regeneration mode. The Engine ECU monitors Particulate
Matter accumulation during normal driving and adjusts the required distance to match the usage of
the vehicle (PM accumulation per km is higher at low average speeds, hence vehicles driven mostly in
urban environments will have a shorter “Distance 1” figure than vehicles that drive mainly extra urban).
- “Distance 2” is a second distance based regeneration mode. This distance is calculated
similarly to “Distance 1”, but also takes into account the amount of PM naturally burnt off during
vehicle usage (under some usage conditions, some PM can be naturally burnt off without entering
automatic regeneration). If natural regeneration is occurring, this distance may be greater than
“Distance 1”.

 

Thanks very much for the answer.
I was kind of hoping the distance1 and distance2 data would give more straightforward data like the interval between the two regenerations but I see the interpretation of these data is dependent on drive style and where car is driven.

According to Mitsubishi workshop (where they made this ECU check) these values are ok but to my experience, I reset the trip each time when engine goes to that "special" mode and I believe it is actually making the regeneration aprox every 250 km +- something.
So now, what to do next..

 

Find a workshop that knows how the system works. Like i said before, yours is not right. those figures need to be higher. Average speed during regen could give some insight if there are no visible faults such as split pipes

 

I have spoken with another workshop. They said that aprox 700 km would be ok distance but on the other hand they said if I don't use highways and driving mostly trough a city with low speeds, 270 km is expected value.
However they are willing to take the catalyst/DPF off (apparently it can be done without taking the front bridge off or disassembling the 4WD cardan shaft) and send it to cleaning proccess. The cleaning should cost me aprox 250 € + 4 hours of mechanics work. So even if DPF turns out to be just fine, I will feel a lot better that capacity is not reduced due to some blockage.

 

If your average speed during regeneration is less than 40 KPH then your DPF will need to try regenerate more, and will block up due to its not getting hot enough.

270 km to next regen is way too low and you will have recurring problems. These cars are no good for around town driving

Is this a Mitsubishi dealer or specialist giving you this advice?

I am a Mitsubishi master technician and deal with these problems all the time