I can force a regen using SSM4 software with a Tactrix 2.0 clone but at your % even that would not work as forced regens are prohibited.
So follow this procedure from
https://www.subaruforester.org/threads/ ... 65/page-16Note the use of ECUTEK for the forced regen, SSM4 will do the same but a EURO5 may need SSM3, or using the info from the post on Romraider you referred to could be used. I also use Peugeot Eloys fluid at 40ml to 60L of fuel to get passive regenerations at lower temperatures instead of the Penrite Enviro+ DPF cleaner. Eloys contains Cerium nano particles which when they combine with the soot make it burn off at lower temps, the dosage rate I obtained from the spec for the auto pump which on Peugeots releases the additive as the tank is filled. As you have had the DPF cleaned it should just need the ECU to be told it has a new DPF fitted, hopefully SSM3/4 can do that.
Rescuing an Overfull (limp mode) DPFI've recently managed to drag back an overfull DPF (>135%, the cutoff for a forced regen and activation of limp mode) to a workable state. Whether the DPF has been permanently damaged or is otherwise not reasonable workable I'm not sure yet as haven't put enough klms on it. The following is a brief synopsis of the situation, items required, techniques/theory used and the results/resolution.
If I get a chance I'll firstly post some screen grabs. After that if I really get a chance I'll write up a separate thread outlining a particular situation, what is required and how to proceed to 'rescue' the DPF.
Situation:
Overfull DPF (>135%) causing limp mode and preventing forced regens.
Situation caused by interminable peak-hour city driving with no relief for the poor vehicle
Soot level at one stage read 255%. I didn't believe it at first- the believed it was likely higher but 255 is the max value for an 8-bit integer (!)
Car was still running OK though
Note Oil dilution and Ash levels were 0%- caused (I assume) by repeated dealer DPF resets when they previously executed forced regens (may have had to 'simulate' a new DPF to force the regen).
Items Used
Penrite Enviro+ DPF cleaner (fuel additive)
OBD-II Bluetooth dongle and Torque Pro on Android (for easy logging/display)
ECUTEK ProECU Tool (on Win 10 laptop)
Freeway with some extended/consistent hill climbs and suitable (hot) weather
Some loading for the car (in this case, approx 6 x 25kg sand bags) + electrical accessory loading
Techniques/theory
Utilise passive regen to get the soot <135% to allow a forced regen
Passive regen occurs/starts around 400C esp. when assisted by a DPF cleaner additive. DPF Temps >400C (under normal running) in the Forester require some load and uphill running in warm/hot conditions
The soot levels can be cross-checked against the DPF differential pressure
Once soot <135%, use ECUTEK tool to initiate forced regen
Once forced regen finished, check running of the car.
If soot cannot be brought <135% to initiate a forced regen, 'install a new' DPF (i.e. tell the car a new one's been installed) and then force the regen
Another alternative is to disconnect the DPF pressure pipes at the differential pressure sensor to allow the computer to rescale the soot itself (based on 0 differential pressure) before forcing a regen.
Results/Outcomes
Basically, the (pretty well) terminal soot loading was reduced to zero. All error codes cleared, car returned to 'normal' driving.
Soot started at 255+% in Sydney.
Drive to Canberra using the DPF cleaner additive reduced soot level to ~192%.
Note soot level firstly rose rapidly on the drive out of Canberra to the freeway hills, touching ~240%. Unloaded Forester driven up & down hills on the freeway. Before cooler weather intervened (and the DPF temp wouldn't get to 400C) the soot briefly touched a min of 130%. Returned home, soot at ~162%. Note car in limp mode limiting fuel, boost, revs but also soot production. DPF pressures ~3-4 kPa at idle, ~14-18 kPa whilst cruising and ~50+kPa worst-case accel.
Some extra DPF cleaner additive added plus some fuel (to bring to additive to 'cleaning' concentration) Forester loaded with sandbags (approx 150kg) and then driven in hot weather (36C) up & down hills on freeway. Extra load added through max A/C, max fan, rear demist and headlights. Again rapid soot increase to ~225% on way out. After that, at one point soot reduced to ~70%. Toilet break with soot at 90% resulted in car restarting out of limp mode- and soot back to 152% by time freeway speed was reached! Back into limp mode, more uphill runs and eventually returned home with soot starting at 90% and not climbing above ~96%. DPF pressures ~2-3 kPa at idle, 10-14 kPa whilst cruising and ~20+kPa worst-case accel.
Forced regen initiated in driveway using ECUTEK ProScan. Extra cooling provided through small industrial fan placed at front of car. Forced regen completes in only about 15 min. Shows minimal oil dilution (<0.5%) and soot reading showing 0%. at the end. Cool car by idling for 4-5 mins, soot then shows ~5%.
Drive a bit next day (e.g. to return sand bags, go to work). Driving mostly suburban and gentle highway cruising. Soot rises to 30% over approx 100km (max). DPF pressures ~0 kPa at idle, 2-3 kPa whilst cruising and ~20+kPa worst-case accel (no limp mode).
(Additional info) No DPF reinstall/reset/reinitialise needed, nor manipulation of DPF pressure has been required...yet!
