- Leading Dpf Specialist
- No Hard Sales Of Services Not Required
- DPF On Vehicle Soot Cleaning
- DPF Off Vehicle Ash & Soot Cleaning
- DPF Regeneration
- Mobile Service
Call Bernie on: 07825 599 348
Call Bernie on: 07825 599 348
Terraclean is a Decarbonisation process administered via your fuel system this enables the clean to reach more places including the injection system.
It restores injector atomisation and remove’s tars and lacquers that build up inside which improves injector response times and fuel vaporisation for a cleaner more complete burn during combustion.
Prices: Up to 2 litre £110 / Larger than 2 Litre £130
DPF regeneration normally takes place automatically, but sometimes for various reasons this may fail to take place leading to the DPF blocking and illuminating a warning light on the dashboard.
Call Bernie on: 07825 599 348
Today’s first Job was to Diagnose a Dpf issue on a Nissan Juke, It had been to another garage for repair and they had tried to clean the Dpf with 3 bottles of Dpf cleaner supplied by a well known motor factors but failed to clear the blockage the customer was told the dpf will need to be removed to be cleaned as they couldn’t clear it with the product supplied to them, the customer decided to book with us instead as we specialize in this type of work.
We confirmed the dpf was in fact blocked and carried out a Terraclean Dpf clean which reduced the soot content enough that we were able to test and carry out a regeneration which was successful.
I was booked to clean a blocked Transit DPF in Stockton-on-Tees because the customer was told the DPF was blocked by another garage & required cleaning.
I always start with a fault code scan and I have to bear in mind some fault codes may not be present as they have often been deleted beforehand which isn’t a good idea if you don’t understand what has caused them.
I was presented with the following codes:
P2033 – Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 2
P246C – Particulate Filter Restriction – Forced Limited Power (Bank 1)
P2463 – Particulate Filter Restriction – Soot Accumulation (Bank 1)
I then view actual live data to establish the calculated soot level, and also measure the exhaust differential pressure so I can decide if the DPF does require cleaning, in this case it could be cleared with a regeneration, the temperature sensor fault is however preventing a regeneration taking place, many people would just replace the sensor (this would have wasted about £200), I went further to establish if the error is the sensor itself or the wiring that its connected to, I first verified the ecu wasn’t receiving any data from the sensor by monitoring live data on the computer with the engine running and compare the temperature of the other 2 sensors and confirmed it wasn’t seeing any data, and to test the wiring I used a sensor simulator which confirmed it still didn’t see any data, I then tested the wiring further down the harness and found continuity to the ecu, so the fault had to be in the harness plug there was no visual sign of a break so I gently pulled on the wires in the back of the plug the signal wire broke free as it was only the insulation that was intact the copper wire inside had broken, I carried out a repair on the wire and retested to confirm the fix.
The moral of this story is that you need to understand the system to be able to correctly assess the problem, before you can fix it, in this case a clean wasn’t required despite another garage saying it did and it wouldn’t have solved the issue.
This car had been to other garages before me and had £600 spent on it and no further forward, in fact the car was losing more power every day.
Initially I scanned for faults and found a fault for differential pressure sensor which is what monitors the dpf pressure and calculates the soot content. so I checked the pressure and found it to be 960 mbar at idle which is severely blocked, I preceded with a Terraclean Dpf clean and afterwards the back pressure was 60 mbar at idle my eventual target is below 10 mbar, my next step was to establish the reason the dpf became blocked, I then identified poor boost performance from the turbo which one garage had told the owner it needed replacing, so I set about with further tests to confirm this but I identified a blocked vacuum pipe which was stopping the turbo being activated.
The Repair to original cause
I cleared the vacuum blockage and normal service resumed, I then drove the car and the car did a successful regeneration with no further issues. If I had been contacted when the problem first started this would have been a very inexpensive repair
Faults Stored on Engine Control Unit:
P0237 – Boost Pressure Sensor Signal Too Low
P2463 – Diesel Particulate Filter Partially Clogged
I was booked to clean the dpf on this vehicle, I always carry out my own Diagnostics which involves more than just reading the fault codes these are only meant to give you a starting point where to start looking for a problem.
The DPF is always the victim so it is important to find the cause first as cleaning alone doesn’t solve the problem, in this case the owner bought the car with the boost issue but no dpf issue at the time, the garage that sold him the car said they would fix the problem and they replaced the Map sensor & turbo vacuum transducer (N75 Valve) which didn’t solve the problem the owner continued to use the car unaware that the DPF can not regenerate with this issue which led to the DPF becoming blocked, the garage wrongly informed the owner that the dpf issue needs to be fixed before they can fix the boost issue that they had so far failed to fix.
My diagnosis involved testing the Map sensor circuit as the ecu wasn’t being provided with the manifold pressure signal so the car was driving in super limp mode, in my tests I established there was no 5v reference voltage going to the sensor so I tested this by providing a 5v feed to the sensor which confirmed the sensor was ok, I then Cleaned the dpf as it was to blocked now to carry out a Forged regeneration, I then carried out a forced regeneration with my Professional diagnostics equipment the car is now fixed and fault free.
The owner had taken the car to several so called specialists with diagnostic tools well capable of doing the work but what they lacked was expertise to use the equipment to find and fix the real problems.