DPF light on, despite new DPF ,running in limp No light,

[froggie]

Hi , I have a headache, My Navara has had DPF light on and wont rev over 3k although no limp light, also fuel gauge and fuel computer are not working.

so many relays and fuses but very little in the owners manual or box covers,

could anyone point me to a wiring diagram please or know the ECU configuration

she has had a brand new DPF fitted and still the same,

Fault code P2002 Will not reset..even momentarily..?

Any ideas as to where to start please?

[Steve H]

Fitting a new DPF generally involves programming the ecu to know the new part is there, without doing that the code will often not erase. Lots of aftermarket diag kit will not carry this task out correctly so may be a job for a specialist or dealer.

If you lost the fuel gauge at the same time then this may not be the solution btw.

[froggie]

Chears Steve , not sure if fuel gauge is relavent to DPF fault dont know when they both went belly up.

The filter was changed @ Nissing main stealer well over £1500 , Their workshop foreman/service manager is off this week ,
May look for DPF Delete and tune if the numbers stack up

[Steve H]

Not always straightforward to delete on the Jap stuff but if the new one was fitted at Nissan I would have expected them to do all the resets no problem, would be worth chasing up with them first of all for sure!

[jmcc500]

DPF failure often consequence of another fault such as a boost leak. Did the dealer check for that? If a bad leak you could kill the new DPF in a matter of seconds!

[ZeusF]

DPF delete isn't all its cracked up to be.
Highly illegal and is simply a hack to remove fault codes as there is no way to truly knock it off.

its the modern day mileage correction

[Steve H]

Twaddle.

Illegal is pretty much a binary state but if we are describing it I'd go for very mildly - not highly.

Mileage correction is generally a fraudulent way of increasing a sale value, nothing like bypassing a fundamentally flawed system that is of no benefit to the driver and of dubious value even to the environment.

[ZeusF]

Steve H said:

Twaddle.

Illegal is pretty much a binary state but if we are describing it I'd go for very mildly - not highly.

Mileage correction is generally a fraudulent way of increasing a sale value, nothing like bypassing a fundamentally flawed system that is of no benefit to the driver and of dubious value even to the environment.

I agree that it isn't a benefit, I've spent years emissions testing but it is illegal, has been for years and carries a £10,000 fine and possible imprisonment. I reckon this is "highly enough"

The problem with pdf removal is that it is a simple case of hiding fault codes and there is no genuine way to remove without any loss to the vehicle, the wy it is done is to hide fault codes and allow full torque control through inj rail pressure and fuel flow.

[ZeusF]

Steve H said:

Twaddle.

Illegal is pretty much a binary state but if we are describing it I'd go for very mildly - not highly.

Mileage correction is generally a fraudulent way of increasing a sale value, nothing like bypassing a fundamentally flawed system that is of no benefit to the driver and of dubious value even to the environment.

I agree that it isn't a benefit, I've spent years emissions testing but it is illegal, has been for years and carries a £10,000 fine and possible imprisonment. I reckon this is "highly enough"

The problem with pdf removal is that it is a simple case of hiding fault codes and there is no genuine way to remove without any loss to the vehicle, the wy it is done is to hide fault codes and allow full torque control through inj rail pressure and fuel flow.

[Steve H]

Nope, it's done (when done properly) by altering the parameters that the ecu works with so it considers an empty DPF to be in good working condition resulting in no fault codes and no running issues. In some cases the ecu is of a type that is made with identical hardware for non-DPF versions and so a pure software delete is available.

Each system is different but while just deleting codes may stop a light on the dash it often won't stop problems with odd regeneration cycles etc, not usually recommended.



Regarding legality, it's an MOT fail but only on a visual test; if it looks like it's there, it's a pass.

I'd be interested to know but I'm guessing that the £10k fine or imprisonment is the same as is available for driving a vehicle that is in any way "unroadworthy", i.e. is an MOT fail?

Nobody gets too worried about doing hard time if they have a numberplate light out or a split wiper blade, AFAIK this is in the same category.

[ZeusF]

Steve H said:

Nope, it's done (when done properly) by altering the parameters that the ecu works with so it considers an empty DPF to be in good working condition resulting in no fault codes and no running issues. In some cases the ecu is of a type that is made with identical hardware for non-DPF versions and so a pure software delete is available.

Each system is different but while just deleting codes may stop a light on the dash it often won't stop problems with odd regeneration cycles etc, not usually recommended.



Regarding legality, it's an MOT fail but only on a visual test; if it looks like it's there, it's a pass.

I'd be interested to know but I'm guessing that the £10k fine or imprisonment is the same as is available for driving a vehicle that is in any way "unroadworthy", i.e. is an MOT fail?

Nobody gets too worried about doing hard time if they have a numberplate light out or a split wiper blade, AFAIK this is in the same category.

Trust me, I've written code for 20+ years on ecu's and it is a trick to fool the ecu. It is also illegal both for the driver and in almost all cases for the file writer.
Laws were changed for the EU several years ago, I think 2011 where the modification of an oem ecu file is illegal unless the code writer is emissions approved although this was not really a strict ruling because no "actual" confirmed ruling was made and it was more of a guideline.

However, the ministry of transport have confirmed that removal of the dpf and the then driving of that vehicle is illegal and can end with the car being crushed.
The problem people have is media hype surrounding this is gaining pace so a groundbreaking charge will soon follow where a public prosecution will surely follow.

[Steve H]

I agree that it's a trick to fool the ecu, I'm not so sold on having to worry about an EU law that isn't really a law at all .

The ministry has been a bit more active about this recently but mainly in threatening to remove licences from MOT stations that perform DPF removals, I'm not aware of any sanctions even being proposed against the general trade or motorists.

[powerstroke]

ZeusF said:

Trust me, I've written code for 20+ years on ecu's and it is a trick to fool the ecu. It is also illegal both for the driver and in almost all cases for the file writer.
Laws were changed for the EU several years ago, I think 2011 where the modification of an oem ecu file is illegal unless the code writer is emissions approved although this was not really a strict ruling because no "actual" confirmed ruling was made and it was more of a guideline.

However, the ministry of transport have confirmed that removal of the dpf and the then driving of that vehicle is illegal and can end with the car being crushed.
The problem people have is media hype surrounding this is gaining pace so a groundbreaking charge will soon follow where a public prosecution will surely follow.

In that case any modification re map, new uprated turbo, air filter or exhaust etc on petrol or diesel vehicles must be illegal????? And the huge aftermarket industry a benefit to the economy also illegal!!!

[ZeusF]

powerstroke said:

ZeusF said:

Trust me, I've written code for 20+ years on ecu's and it is a trick to fool the ecu. It is also illegal both for the driver and in almost all cases for the file writer.
Laws were changed for the EU several years ago, I think 2011 where the modification of an oem ecu file is illegal unless the code writer is emissions approved although this was not really a strict ruling because no "actual" confirmed ruling was made and it was more of a guideline.

However, the ministry of transport have confirmed that removal of the dpf and the then driving of that vehicle is illegal and can end with the car being crushed.
The problem people have is media hype surrounding this is gaining pace so a groundbreaking charge will soon follow where a public prosecution will surely follow.

In that case any modification re map, new uprated turbo, air filter or exhaust etc on petrol or diesel vehicles must be illegal????? And the huge aftermarket industry a benefit to the economy also illegal!!!

The official sanction is that after making a change you must be able to prove the change has not negatively effected the emissions of the vehicle. They have also placed rules where the person carrying out the changes has to be suitably qualified.

[Mr2Mike]

froggie said:

Hi , I have a headache, My Navara has had DPF light on and wont rev over 3k although no limp light, also fuel gauge and fuel computer are not working.

so many relays and fuses but very little in the owners manual or box covers,

could anyone point me to a wiring diagram please or know the ECU configuration

she has had a brand new DPF fitted and still the same,

Fault code P2002 Will not reset..even momentarily..?

Any ideas as to where to start please?

P2002 simply means that the ECU is seeing excessive back pressure in the exhaust, which is assumed to be caused by a blocked DPF. It's possible that either something further downstream in the exhaust is causing a blockage (e.g. a silencer internally collapsed, pipe flattened due to hitting something) or the sensor itself or it's wiring has a fault.

[b4rk3r]

After the DPF has become blocked usually the exhaust pressure will sensor need changing. Try cleaning it out or grab a new one, genuine one if possible.
This happens all the time after having a new DPF or DPF removal.



The whole 'tricking' the ecu is bks. If it's tricking the ECU then why is there a single byte switch inside the majority of ECUs to turn DPF functionality off?
Most companies mask the problem by killing post injection maps, erasing fault codes and butchering limp home torque limiters. If you know the byte sequence, DPF off is not a problem

Edited by b4rk3r on Monday 22 December 00:00

[jmcc500]

The reason for the code for DPF strategies being switchable easily is because the software is generally generic and used on non-DPF applications as well. It is not there because the manufacturers condone DPF removal!

[Cerberaherts]

ZeusF said:

The official sanction is that after making a change you must be able to prove the change has not negatively effected the emissions of the vehicle. They have also placed rules where the person carrying out the changes has to be suitably qualified.

I've never heard of any such sanctions. At present anyone can become an "ecu mapper" by paying a few hundred quid to many of the companies on the internet selling such a service.

[ZeusF]

Cerberaherts said:

ZeusF said:

The official sanction is that after making a change you must be able to prove the change has not negatively effected the emissions of the vehicle. They have also placed rules where the person carrying out the changes has to be suitably qualified.

I've never heard of any such sanctions. At present anyone can become an "ecu mapper" by paying a few hundred quid to many of the companies on the internet selling such a service.

Very true, but that doesn't make it legal.
EU law prohibits negative change to the emissions of a vehicle, it also prohibits alteration to the DPF system away from OEM spec and even advertising such a service is illegal (you can't legally advertise and illegal activity)
I am not saying people can't/won't do it but it is illegal.

[Cerberaherts]

So does fitting of 100cel cats etc also fall foul if this law? Aftermarket systems aren't approved and most I've seen are not stamped with "not for road use"