Peugeot - Citroen FAP filter deactivation

[worldiagnostic]

Hello all. Anybody met a problem, that could be solved by removing the annoying FAP filter from PSA cars?

Below is all info I have, probably there are people who would like to share knowledge on this matter?

In theory yes you can remove the FAP without any ECU reprogramming and also if required you will be able to restore back the FAP system:
All you have to do is to trick the car system that the FAP it is working OK.

This way you will solve problems like: Risk of FAP blocking, Aditive low... and save some money for this FAP system.


3) tube from FAP injector to fuel tank need to be removed and need to be rerouted in to the FAP tank. This way the FAP injector will still work as it is supposed by car ECU and the EOLYS additive will never get low because it will be injected in the same tank of additive.

2) FAP filter need to be removed or maybe just put a hole in old filter but the hard part come now:

1) You will have to trick the differential pressure sensor to stay in the area of normal filter, this way the engine management will not send a request for regeneration and will work forever OK.

"DIFFERENTIAL PRESSURE SENSOR
The differential pressure sensor constantly measures the difference in pressure between the inlet and outlet of the
catalytic converter/anti-particle filter assembly.
This measurement makes it possible to determine the blockage level of the filter. The sensor consists of:
- an electronic circuit for amplifying the signal,
- a sensitive diaphragm.
The diaphragm is subjected on one side to the catalytic converter inlet pressure (upstream) and on the other side to
the filter oulet pressure (downstream).
The sensor provides a voltage proportional to the differential pressure measured by the diaphragm (?P = upstream
pressure - downstream pressure)."

How you can do this, need to be study and check the value reported by the pressure sensor. Once we have that value it is almost done or maybe another idea it is to find the diameter of the hole needed to be driled in old FAP by experiments and math to match the pressure needed by differential pressure sensor to stay in the area of normal filter .

edit:
As I seen from diagram there are 3 wires to this sensor so it must be:
3 - RED- VCC 5V or constant value.
2 - White - GND
1 - Orange - V from Sensor mesurement (~4.64v I have Risk of filter blocking....
( not is this order )

all you have to do is to check that V from sensor and put a resistor from VCC to that wire.
Resistor it is easy to calculate once we have the normal value from that pin.

this is all, job done, no more FAP problems.

[cars]

There is only one small problem in the tank Cerina there 'is not a
indicator for cerina level, so the ECU is a theoretical calculation based on the injection level in the tank.
After a specific number of injections, the ECU thinks it has finished Cerina and turns on the MIL light, in this case, just reset the counters in the engine control unit or ECU FAP this happens every 80000 Km or 120000 Km depending on the model.

PS:The latest PSA cars with FAP second generation have very few problems.

Sorry for my English.

[citronel]

nice... that theory was posted by me last year on eurovan2 forum when I bought my C5 1.6HDI FAP and had to solve the FAP problems...
my problems was simple just: FAP washing + Eolys refill and additive computer reset and all was ok.

To be sure that FAP will complete each regeneration properly I developed a device that signal regeneration phase on HDI engines so no more problems:
Sensor Regeneration FAP & Turbo temperature

In the meantime I study a different approach of FAP removal:
if anybody with Lexia have access to PSA engines with no FAP: DV6, DW10, DW12 and can make a print of BSI & ECU configuration settings will be great to complete my study.

thx

[fckju]

hi,
the bsi et ecu configuration are the same, just FAP present or not.

to analyse the FAP data in ecu and BSI,it's more complicated.

you can take xsara and c5 dw10 without FAP engine RHZ
and 307 engine RHS, there the same ecu but one have FAP and the other have.

there is a mux communication between engine ecu, additive ecu, i don't know how to remove it.

for the moment i clean FAP and put 0 in ecu.

[citronel]

As I told, If you have access to PSA engines with or without FAP and Lexia please make a print of ECU & BSI configuration from DV6, DW10, DW12 and send me.
I am on the right way to remove the FAP without simulate it.

thx

[worldiagnostic]

This sound interesting. You are doing the correct job I would say
My best regards.

[erikfrog]

I have experience with damaged FAP, so I?ve made fake "filter" to break exhaust gas. Because sensor of differential pressure check the difference before and after FAP. Original cerine I?ve changed to fuel. 20 000km and everything OK. No faults.

My question is: How to disable FAP in engine ECU? In BSI I can switch to not present. I have multidiag...

[citronel]

I discovered that some parameters in ECU settings refer to NO FAP system; this is why I want to compare few prints of ECU parameters configuration and ECU sw version.

erikfrong what engine do you have ?

[erikfrog]

2.0 HDi 110PS year 2004
when I set the FAP in BSI not present, car is running without MIL but in engine ecu are DTC?s. Additive pump etc... but engine ecu still compare pressure before and after FAP and this is the main problem. I think that is only one way use "tunned" software for ECU and turn off in BSI. Remove FAP and thats all

[TFT]

Hi guys.
I am very interested this theme.
I have read with difficulty that you are working on the elimination of FAP.
I have a 2.0 HDI 136cv.
As with the Peugeot PPS, an option to tell FAP FAP YES or NO.
One person I know has put into NO and nothing happens rarely.
My question is:
What if the PPS is disabled fap, we can empty it without danger to our error?
Thank you.
NOTE: sorry for English. I am Spanish and use a translator.

[erikfrog]

You can only disable fap only in BSI. I haven ?t found this option in engine ECU.

[TFT]

And so in the bsi not be enough?
An acquaintance is testing inactivated. Spent 2 days with the FAP off flawlessly.
What remains to be tested is pouring to make sure everything goes well.

[irome]

thanks i will try cancel fap

[erikfrog]

And so in the bsi not be enough?
An acquaintance is testing inactivated. Spent 2 days with the FAP off flawlessly.
What remains to be tested is pouring to make sure everything goes well.

No it isn?t enough because you turn aditive system off. But engine ecu still monitor pressure difference. And then after fill up, damaging or removing filter ecu will work in emergency with 2000rpm and you are at the end.

[Kaizu]

No it isn?t enough because you turn aditive system off. But engine ecu still monitor pressure difference. And then after fill up, damaging or removing filter ecu will work in emergency with 2000rpm and you are at the end.

Any ideas is it possible to download different programm to car. I suppose that there is 2.2 hdi motors without fap?

Could that be possible?