Hello, I am am the new owner of a CX-7 2.2 DIESEL. The car has its its EML on and the DPF light is flashing, its also in limp mode with reduced power. I have Forscan and have tried to clear the P2463 code (DPF restriction soot accumulation bank 1) without success. The code and lamps immediately re-appear. So far I have tried the following:

Taken car for a run at 3000 rpm for 25 mins - no change
Performed a stationary forced regeneration, this completed in about 45 mins and the exhaust got very hot.
Re set the oil degradation setting in the service part of Forscan (even though I have not changed the oil until next week).

The only other idea I have is that maybe its a faulty DPF pressure sensor. Can anybody give me any advise as I thought doing a forced regen would cure the blocking problem. The car revs OK when stationary so it does'nt seem the exhaust is very blocked.

Thx David
.

 

No miracles in this world, the car needs to be inspected. Any other codes present?
If not, DPF likely clogged beyond self-regen capabilities, in that case there are shops that offer DPF cleaning (washing). (Even mobile mechanics, i've seen it on youtube, do not know if it effective or not...)
Other possibilities (not all of them) are
- pressure sensor piping problem (clogged, damaged)
- pressure sensor itself damaged (but in this case PCM should throw another DTC, something like "sensor performance problem". Not necessarily, though.)
Check actual soot accumulation (or what PCM thinks it is ) PM_ACC, PM_ACC_DSD, PM_GEN.
Anyway, i'd suggest bringing it to mechanic for diagnostics.

 

The above advise is a good starting point, and more details can be found like he did on the internet however, should you need to take it to a independent service shop make sure they have a trained Diesel "Technician" and not the run of the mill "mechanic".

 

many many thx for your reply Institor, but how do I " Check actual soot accumulation (or what PCM thinks it is ) PM_ACC, PM_ACC_DSD, PM_GEN ? " I've just been in the car for 30 mins trying to find these options in ForScan and I dont see them . No other fault codes are present in any domain. Did think about ordering a DPF pressure sensor (the one in the engine bay). Any idea which is bank 1 of DPF. I understand there are 4 sensors screwed into the DPF. 3 x Exhaust Gas Temp sensors and 1 x 0xagen sensor. Anybody know which is the bank 1 sensor ?

 

What year is the car? these PIDs should be in PCM module.

 

It may be he does not know how to access them. Why don't you explain to him how using his ForScan ?

The best advise is to go to a service shop and at least pay for a basic Diagnostic scan that can be done properly and maybe an assessment of your problem's Otherwise Diesel do require a little skill to diagnosis issues and you may be guessing at the wrong solutions

We do have a member that works more often on diesels and is a Mazda Trained diagnostic mechanic that may respond in but he has been absent the forums a few days

 

2009 model year. UK reg in March 2010. Car has also been to garage and been seen by a diesel mechanic, (not a Mazda dealer they are far to expensive). Diagnostics Indicate soot build up in bank 1 of DPF. Its going in again next week to have the DPF pressure sensor & pipework looked at/taken off and cleaned. I would just like to know how to read % of dpf blocking in ForScan.

 

It's simple, you have to add PIDs to dashboard from list of available PIDs.
1) Connect to the vehicle (on the fist screen using connect button below)
2) Select Dashboard, click on settings (gear icon), select module (PCM or ALL), filter by "PM_", add PIDs to "selected PIDs" column, save your setting, press play button

 

This is really better based on my opinion and level of experience working in the real world with service customers weekly as well helping thousands of members on forums over the years I think I can get a pretty good feel for what they are DIY capable of or not.

 

Thx again 4 your your help. This is what i can find, but i still cant see where i can find the % blocking. Previous owner had no idea about cars and has been using it witout dpf regenerating for 9600 kms !