13. Finding DPF switch in EDC16 ECU

Diesel Particulate Filter (DPF) Switching in EDC16 ECU.   Before switching off the DPF function in your ECU you must decide what to do about the hardware fitted to the car.  The hardware is the DPF/Catalyst and the wiring/sensors. Options.   1. Original look.  Remove DPF/catalyst. Open case and empty the inside. Refit. Leave all original sensors and wiring in place.  In some countries this may be the only option allowed.   2. New pipe.  Remove DPF/catalyst and replace with a pipe. 2a. Keep sensors and wiring 2b. Remove sensors and wiring.*   *If you remove sensors and wiring you may get fault codes and even a dashboard warning.  These will need coding out of the ECU file.   Don’t rip out the DPF yet.  Some ECU files get very upset if you try a DPF file delete solution when the DPF is already reporting full and failed regeneration.  It is advisable to always do a forced regeneration first before touching the DPF or the ECU file.   What if forced regeneration doesn’t work?   You may have to remove the DPF and soak it in something like alloy wheel cleaner for a day or so. Flush out with hot water if possible.  Refit and try the forced regeneration again.   DO NOT INSTALL A DPF OFF FILE BEFORE THE HARDWARE HAS BEEN SORTED   With the hardware sorted you are ready to modify the ECU file. As usual the information here is based on using Winols to examine and modify your file.   There are two simple methods to find the DPF switch in most edc16 ECU’s. 1. Search the text using Winols search function. 2. Search a 2D view using your eyes.   Both methods rely on you looking for the switch once your search has got you to the right area.     1. TEXT SEARCH   The file below has been opened in 16 bit, decimal (255), LoHi view.   1. Set the view to text 2. Open ‘Search’ and then search for decimal byte sequence (decimal tab) 3. Enter  32767, 32768 Click right arrow button or Enter button.   The view should look like this;

You won’t see the YELLOW highlight. I added that.

 

The addresses for 32767 and 32768 will be highlighted. (Grey in this example).  This sequence may occur more than once in a file so you may have to toggle between text and 2D view to help confirm that you are in the right place. (See 2D picture below)

 

4. Make sure you have a least 2 rows in your view before and after the selected two addresses.

 

5. Most files look similar to the view above.

E.g

 

32767  32768  00000  00655  00256  00000  00000  00030  65535

 

It is important to view at least 20 addresses after the highlighted pair (32767 and 32768).because the DPF switch is not always at exactly the same address in all ECU files.

 

In 16 bit decimal view the DPF switch is 00256.  In the example you can see at the third address after the highlighted addresses. e.g

 

32767  32768  00000  00655  00256  00000  00000  00030  65535

 

In most files the DPF switch 00256 is within 1 – 3 addresses of the highlighted addresses.

 

The correct DPF switch position is highlighted in YELLOW on the above picture.

 

Changing the value 00256 to 00000 will switch off all DPF functions *

 

2. 2D SEARCH.

 

If you prefer to search in 2D mode, you can. You will still be looking for 32767, 32768, not as numbers but as a spike on the 2D chart.

E.g.

As you can see, the DPF switch location is not obvious when viewing in 2D mode but the little bumps of the Torque limiter are a good marker to the correct area in the file.  The DPF switch may not show but 32767, 32768 do show as a peak as shown on the picture above.  It doesn’t matter if you choose the wrong peak. Just mouse over the peak and the numbers should pop up. If not, switch to text view and look for the numbers 32767, 32768.

 

Once you find 32767, 32768 search for the DPF switch as explained above.

 

* Does this really work?  Is the DPF really switched off when 00256 is changed to 0000?

 

With EDC16 ECU’s the single switch should turn off all DPF functions but a few people have experienced slight running problems with some ECU’s.  This is usually because the advice at the start of this article was ignored.

 

If you ripped out the DPF and sensors and wiring without resetting DPF regeneration status first you are in trouble and need professional help.