Flow chart
| reference | designation | electrical diagram number |
|---|---|---|
| (1) | particle filter differential pressure sensor | 1341 |
| (2) | fuel cooler | - |
| (3) | fuel tank unit | 1211 |
| (4) | fuel filler cap | - |
| fuel tank cap presence sensor | 4320 | |
| (5) | fuel additive injection valve | - |
| (6) | Fuel additive ECU | 1282 |
| (7) | fuel tank | - |
| (8) | engine ECU | 1320 |
| (9) | catalytic converter + particle filter (FAP) | - |
| (10) | additive tank | - |
| (11) | downstream exhaust gas high temperature sensor | 1343 |
Additive
Role
Role of the additive
- To lower the combustion temperature of the particles to 450°C (instead of 550°C)
- To impregnate the particles forming in the combustion chamber
- To propagate combustion of the particles
NoteThe cerin contained in the fuel additive permits lowering of the particles combustion temperature to 450°C (instead of 550°C)
Description
Additive EOLYS (supplier "RHODIA")
Composition
- Cerine: 6,5% by mass (EOLYS 176)
- Catalytic converter: brown colour
- Solvent product (combustible hydrocarbon)
NoteThe cerin is not burned during the regenerations (artificial or natural). the cerin eventually clogs the particle filter which must be replaced every 120 000 kms (75 000 miles)
Additive tank
Location
"a" Fuel tank.
(10) additive tank
Description
| reference | designation |
|---|---|
| "a" | fuel additive filling inlet |
| "b" | breather |
| "c" | breather |
| "d" | outlet to fuel additive injection valve |
| (12) | filling union (by the Customer Services) |
| (13) | filling union (at the factory) |
| (14) | fuel additive pump (1283) |
Capacity of the fuel additive tank
- XSARA PICASSO: 4 litres
- CITROEN C5: 5 litres
NoteIn after sales, 3 litres of fuel additive are used, whatever the vehicle
NoteThe "fuel additive level check" procedure specifies the method for checking the level of fuel additive in the vehicle
Fuel additive ECU (1282)
Role
The fuel additive ECU manages
- The detection of an addition of fuel
- The quantity of additive to be injected in relation to the fuel added
- The minimum additive level in the additive tank
- The diagnostics of the fuel additive pump and of the fuel tank cap
Description
| make | supplier's Part No. |
|---|---|
| MAGNETI MARELLI | EAS 200 |
ECU pins
| connector -way | signal |
|---|---|
| 1 | power supply (for the fuel additive pump) |
| 2 | fuel additive ECU supply (1282) |
| 3 | + Body VAN2 |
| 4 | fuel tank cap presence switch earth |
| 5 | - |
| 6 | fuel additive level measurement signal (*) |
| 7 | fuel additive level measurement signal (*) |
| 8 | fuel additive pump earth (1283) |
| 9 | control of the fuel additive pump (OCR) |
| 10 | - |
| 11 | - |
| 12 | fuel filler cap presence sensor information |
| 13 | - |
| 14 | Body VAN 2 (data) |
| 15 | Body VAN 2 (data /) |
| 16 | earth |
The fuel additive level sensor is fitted on and connected to the fuel additive ECU (1282) but is not functional
Fuel additive pump (1283)
Location
The fuel additive pump is immersed in the fuel additive tank
NoteThe fuel additive pump cannot be separated from the fuel additive tank
Description
| reference | designation |
|---|---|
| "d" | outlet to fuel additive injection valve |
| (15) | connector |
| (16) | fuel additive level sensor (*) |
| (17) | positive displacement metering pump |
(*): the fuel additive level sensor is fitted on and connected to the fuel additive ECU (1282) but is not functional
The fuel additive pump is a positive displacement metering pump
The quantity of additive delivered depends on the unit capacity of the positive displacement metering pump
The unit capacity of the positive displacement metering pump is 6,45 mm3
Depending on the quantity of fuel added, the fuel additive ECU determines the quantity of fuel additive to be injected into the fuel tank
The fuel additive ECU controls the positive displacement metering pump by means of an OCR signal
Note1 pulse of the OCR signal = one injection of a capacity of 6,45 mm3
NoteOCR: opening cyclic ratio
Fuel additive pump connector
| channel of the fuel additive pump connector | signal | terminal at the fuel additive ECU (1282) |
|---|---|---|
| 1 | - | - |
| 2 | - | - |
| 3 | RCO signal | 9 |
| 4 | earth | 8 |
| 5 | fuel additive level measurement signal (*) | 6 |
| 6 | fuel additive level measurement signal (*) | 7 |
(*): the fuel additive level sensor is fitted on and connected to the fuel additive ECU (1282) but is not functional
The fuel additive pump (1283) is controlled by an OCR signal
Features of the OCR signal
- Opening ratio of 50%
- Frequency of the OCR signal 66,67Hz
- Amplitude of the OCR signal 12 volts
Fuel additive injection valve
Location
| reference | designation |
|---|---|
| "e" | fuel additive supply pipe |
| "f" | fuel additive outlet into the diesel fuel tank |
| (5) | fuel additive injection valve |
| (7) | fuel tank |
| (10) | fuel additive tank |
| (14) | filling union (at the factory) |
Role
The fuel additive injection valve injects a quantity of fuel additive determined by the fuel additive ECU into the fuel tank
Description
The fuel additive injection valve is a mechanical valve
Pressure of the fuel additive injection valve
- 0,1 bar (relative pressure)
- 1,1 bar absolute pressure
Fuel tank cap presence sensor (4320)
Location
The fuel tank cap presence sensor (4320) is located between the tank cap and the filler tube
Role
The fuel filler cap presence sensor informs the additive ECU whether the filler cap is open or closed
Role of the additive ECU depending on the information received: to detect that fuel may be added
Description
(18): contact
(19): permanent magnet
The filler cap is fitted with a magnet and when the cap is closed, the magnet is opposite the contact
Connections
| channel of the fuel tank cap presence sensor (4320) | signal | terminal at the fuel additive ECU (1282) |
|---|---|---|
| 1 | 12 volts supply | 12 |
| 2 | fuel tank cap presence switch earth | 4 |
Fuel gauge pump (1211)
Role
The fuel sender informs the additive ECU of a variation in fuel level through the built-in systems interface
Role of the additive ECU depending on the information received
- Determine the amount of additive to be injected
- To control the additive injection pump
Description
| height of the float pin in relation to the base plane | resistance |
|---|---|
| 14 mm | 350 ± 5 ohms |
| 44 mm | 300 ± 5 ohms |
| 75 mm | 250 ± 5 ohms |
| 110 mm | 200 ± 5 ohms |
| 139 mm | 150 ± 5 ohms |
| 171 mm | 100 ± 5 ohms |
| 202 mm | 50 ± 5 ohms |
| height of the float pin in relation to the base plane | resistance |
|---|---|
| 14 mm | 350 ± 11 ohms |
| 41 mm | 300 ± 10 ohms |
| 72 mm | 250 ± 10 ohms |
| 104 mm | 200 ± 9 ohms |
| 138 mm | 150 ± 9 ohms |
| 171 mm | 100 ± 8 ohms |
| 204 mm | 50 ± 2 ohms |
NoteThe fuel sender cannot detect a variation in fuel level of less than 7 litres precisely