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1,271 Posts
Discussion Starter #1
Hello chaps,

These dpf's - or fap's as our continental colleagues like to call them.

Seems to me that filling up the additive container is fairly straightforward - a simple diy bodge job. The issue appears to be opening the fuel cap and the ecu counter having to be reset.

Has anyone tried disabling the opening fuel cap mechanism - so that the ecu never counts down - so you only need to keep an eye on the fluid level.

In fact has anyone tried disabling the whole lot and simply adding the eolys ala redex style to each tank of fuel?

1,271 Posts
Discussion Starter #2
Stole this off another forum :

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.

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 .

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.
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