DPF and white smoke

[cuda]

Another update - Performed 4 manual forced burns and have now travelled 120km and DPF percentage stable and only increasing slowly and currently 48%. I'm thinking if DPF is starting to block then the DPF percentage is unstable and will go up and down without an actual burn taking place. Perhaps it would be prudent for users to force a burn if they start to see this behaviour.

Thanks
Doug

[JohnLynn]

@ Cuda when you triggered a manual burn and got the % to drop to zero did you notice that the FB had reverted to 1.00? this is what my FB was on leaving the dealer after the update but after 3 regens before the car was stood up it had risen back to 1.04 so I am wondering if the dealer's update reset it or the fact that the burn reduced the % to zero which doesn't usually happen.
We all seem to agree that the burn after the update is faster, so for this to happen the temperatures must be hotter? yet in the short time that I had to monitor after the update my temperatures were fine but I cant honestly say that they were that much higher than before. Bear in mind that I haven't had a problem, I am just curious.
As for the "recalculation" what is that all about? why would the % rise quickly after a burn then "reset" to a more sensible level? I think the bloke who wrote this software has some explaining to do!
It fascinates me that several owners have asked dealers questions and they don't seem to have a clue how all this works, what is the point of Toyota keeping their own dealers in the dark, let alone their customers?

[vxowner18]

My 2018 GXL will clock up 30,000Km in the next week.

I have logged all full regens that have occurred (88 so far).

Pre ECU update the regens have occurred mostly after 300km - 370Kms, occasionally hi 200Kms. Regens have taken 6-8Km at 15-30Km/hr, 15-25Km @ city speeds, and 70-100Km @highway speeds. One outlier as mentioned above.


Post ECU update the few regens that have occurred were after 200-350Kms and one at 230Kms. But the burns have been very quick 10, 21(@ highway speeds), 13 & 6Kms.

The quick buildup of DPF% from 0-6% to over 50% followed by a big drop is hard the fathom. My one theory is that, when empty, the DPF can soot up superficially very quickly and form a thin barrier which affects the differential pressure, but at some point the this soot barrier cant hold back the exhaust pressure and so gets blown out. Thus the big drop in DPF% reading.

I didn't log all my regenerations, but by looking at yours, mine is a quite similar case. my car is approach 20,000 km soon.

[vxowner18]

The Passive regen isn't real. I've seen the DPF go from 70% back to 10% after leaving it overnight with no heat added in between.

I'm suspecting that Toyota is finally using the differential sensors for feedback and thats how the percentage full is now worked out. Toyota dealer was unable to provide me with information about the change in the program and if the differential sensors are being used.

I don't believe passive regen is real either, as I've quite a lot of soot% dropping on Torque, and the highest exhaust temp didn't even go over 400c', which was not hot enough for a passive regen.

However, I haven't seen such a big soot% drop on my car ever, 70% down to 10%??? The biggest drop I have seen on my car was from high 60% back to low 40%. And also, the soot% stays the same as the read when the engine was turned off, the soot% always drops while the car is moving.

The regen takes 270-330km interval pre and post ECU update. I haven't picked up any obvious change except the regen now finishes within 10mins mark. The slower I drive, the less time it takes. The max exhaust temp reached 737c'.

My car is now approaching 20,000km now.

[RPP]

So how many KM's have you doen with your vehicle so far? I have since done another 3 forced regens to see if I can improve on the km's before a burn. I've had 3 now around 170km. Hoping to see an improvement now I have smashed the DPF filter with some serious burning.

My 2018 GXL will clock up 30,000Km in the next week.

I have logged all full regens that have occurred (88 so far).

Pre ECU update the regens have occurred mostly after 300km - 370Kms, occasionally hi 200Kms. Regens have taken 6-8Km at 15-30Km/hr, 15-25Km @ city speeds, and 70-100Km @highway speeds. One outlier as mentioned above.


Post ECU update the few regens that have occurred were after 300-350Kms and one at 230Kms. But the burns have been very quick 10, 21(@ highway speeds), 13 & 6Kms.

The quick buildup of DPF% from 0-6% to over 50% followed by a big drop is hard the fathom. My one theory is that, when empty, the DPF can soot up superficially very quickly and form a thin barrier which affects the differential pressure, but at some point this soot barrier cant hold back the exhaust pressure and so gets blown out. Thus the big drop in DPF% reading.

[Gurilla]

Experienced my first dpf burn today... car has 6000km I’m sure it’s done it lots when the missus drives it but first time I’ve noticed it happen ?

was doing some start stop driving and noticed the car was a little louder and the revs were just below 1000rpm at idle when at traffic lights

[cuda]

Hi Cuda,

Mine was doing the same thing, even before the ECU update.

If you could have a look at other posts here, you would be able to find out more about what so called 'PASSIVE REGEN OR RECALCULATION'.

Cheers,

The Passive regen isn't real. I've seen the DPF go from 70% back to 10% after leaving it overnight with no heat added in between.

I'm suspecting that Toyota is finally using the differential sensors for feedback and thats how the percentage full is now worked out. Toyota dealer was unable to provide me with information about the change in the program and if the differential sensors are being used.

[cuda]

I've had the same thing occur occasionally, not often. PDF% will grow quickly 1% every 1km or so, then around 60% (sometimes less), it will drop to the mid 20s and then grow very slowly.

Once I even had it jump from 6% to over 50%, followed by a DPF regen after just 100Km

This has happened before the ECU update as well. Then I get some 'normal' PDF cycles.

So how many KM's have you doen with your vehicle so far? I have since done another 3 forced regens to see if I can improve on the km's before a burn. I've had 3 now around 170km. Hoping to see an improvement now I have smashed the DPF filter with some serious burning.

[vxowner18]

Ok so after forcing 2 regens to occur the DPF percent is sitting at 0%. So I drive for 4km and it goes to 2% which is no biggy expecting roughly 8 to 10km to shift to 4% but unfortunately next jump 16% and then 20% now sitting at 60% full and Ive only done 40km. This is with the 2018 model and only having driven 22000km. Not looking good. Anyone else monitoring the percentage full?

An update - New firmware behaves wierdly. I have now driven 76km and the percentage was dropping from 60% all the way down to 24%. Be interesting to see where the final 100% full will be in relation to km's travelled.


Thanks
cuda

Hi Cuda,

Mine was doing the same thing, even before the ECU update.

If you could have a look at other posts here, you would be able to find out more about what so called 'PASSIVE REGEN OR RECALCULATION'.

Cheers,

[RPP]

I've had the same thing occur occasionally, not often. PDF% will grow quickly 1% every 1km or so, then around 60% (sometimes less), it will drop to the mid 20s and then grow very slowly.

Once I even had it jump from 6% to over 50%, followed by a DPF regen after just 100Km

This has happened before the ECU update as well. Then I get some 'normal' PDF cycles.

[cuda]

Ok so after forcing 2 regens to occur the DPF percent is sitting at 0%. So I drive for 4km and it goes to 2% which is no biggy expecting roughly 8 to 10km to shift to 4% but unfortunately next jump 16% and then 20% now sitting at 60% full and Ive only done 40km. This is with the 2018 model and only having driven 22000km. Not looking good. Anyone else monitoring the percentage full?

An update - New firmware behaves wierdly. I have now driven 76km and the percentage was dropping from 60% all the way down to 24%. Be interesting to see where the final 100% full will be in relation to km's travelled.


Thanks
cuda

[404pug]

The saga continues. The first post reflash burn occurred at 300 km [ a 30 km improvement on pre reflash] and lasted only 8 km at 60-70kph [ much better than the previous 30 + km] BUT no flashing light ie custom mode [ which I have been twice told is enabled] is not working so the switch is really a dash ornament. I will watch it for another cycle or 2 before i head back to the dealer to get them to fix it properly. Why can't Toyota and its dealers get things right first time? grrr

[Faulco]

However, in a confusing twist, I have a 2018 GXL and the Booklet says I should be getting a flashing DPF symbol to show a Regen In Progress, but I actually get the message as per the VX and Kakadu. No that I'm complaining tho.

I think Toyota must have upgraded the displays on the later model GXLs. My 2015 GXL only gives me the flashing DPF symbol when a regen is in progress.

[RPP]

I've got my ecu update in Jan, with a manual push button installed in early Feb, my car still does an auto burn every 300km-ish.

Having said without the custom mode enabled, my push burn button is there for nothing unless DPF attention warning lamp is ON.

According to that DPF booklet, my understanding is, if you have got the custom mode enabled, you should be able to initiate a manual burn when soot% is approx 30% and over (green zone on page 9), while the engine is under normal working temperature.

I did press my manual button a couple of times, but I couldn't start a manual burn at all, that could mean the custom mode was not enabled or not working on my car. I will talk to the dealership when next service due.

I also get a Regen every 300Km or so now, and they complete a little quicker than before.

Also just got my vehicle back with a DPF button installed.
At the start I showed the white collar reception guy the Toyota Australia DPF Info Booklet to get an explanation of the customise/custom mode.
He left with some notes for the backroom guys. When I picked the car up I was informed that no one there had seen the Booklet (they are the largest dealer in this city).
So I asked for some user documentation and got two pages that didn't tell me anything I didn't already know.
I also got a sticker on the driver's door informing me that I have the DPF button and that I should use it when the DPF light comes on!

When I had the ECU update done in Feb I asked for, and got, the Custom Mode so that I get the DPF Regen In Progress message. Hopefully that means I get to initiate a burn as per the Booklet.
However, in a confusing twist, I have a 2018 GXL and the Booklet says I should be getting a flashing DPF symbol to show a Regen In Progress, but I actually get the message as per the VX and Kakadu. Not that I'm complaining tho.

[vxowner18]

I've got my ecu update in Jan, with a manual push button installed in early Feb, my car still does an auto burn every 300km-ish.

Having said without the custom mode enabled, my push burn button is there for nothing unless DPF attention warning lamp is ON.

According to that DPF booklet, my understanding is, if you have got the custom mode enabled, you should be able to initiate a manual burn when soot% is approx 30% and over (green zone on page 9), while the engine is under normal working temperature.

I did press my manual button a couple of times, but I couldn't start a manual burn at all, that could mean the custom mode was not enabled or not working on my car. I will talk to the dealership when next service due.