Flow chart
A - VAN network
B - CAN network
| reference | designation | part number in the electrical diagrams |
|---|---|---|
| 1 | additional heater control relay | BCP3 |
| 2 | additional heating (electrical resistors (2a) or heater (2b)) (*) | 8098 - 1190 |
| 3 | variable geometry turbocharger | -- |
| 4 | air flow meter air temperature sensor | 1310 |
| 5 | air cleaner | -- |
| 6 | catalytic converter | -- |
| 7 | particle filter | -- |
| 8 | exhaust gas temperature sensor (downstream of the catalytic converter) | 1343 |
| 9 | differential pressure sensor | 1341 |
| 10 | exhaust gas temperature sensor (upstream of the catalytic converter) | 1344 |
| 11 | turbocharging pressure regulation solenoid valve | 1233 |
| 12 | recycling regulation electrovalve (EGR) | 1253 |
| 13 | finned diffuser piston control pneumatic capsule | -- |
| 14 | exhaust gas recycling valve (EGR) | -- |
| 15 | water-to-air heat exchanger (inlet air heating) | -- |
| 16 | exhaust gas/water exchanger (EGR) | -- |
| 17 | inlet air heater throttle control electrovalve | 1285 |
| 18 | atmospheric pressure sensor (integrated in the injection ECU) | 1320 |
| 19 | injection ECU | 1320 |
| 20 | heated rear screen | 8120 |
| 21 | stability control ECU (*) | 7800 |
| 22 | automatic gearbox ECU (*) | 1360 |
| 23 | trip computer (*) | -- |
| 24 | electronic tachometer | 4210 |
| 25 | service LED | -- |
| 26 | pre-heating warning light | V1150 |
| 27 | diagnostic warning lamp | V1300 |
| 28 | fuel level indicator | -- |
| 29 | fan | 1510 |
| 30 | air conditioning compressor | 8020 |
| 31 | engine coolant temperature warning light | V4020 |
| 32 | engine coolant temperature gauge | 4026 |
| 33 | built-in systems interface | BSI1 |
| 34 | cruise control switch | 7300 |
| 35 | cruise control safety contact | 7305 |
| 36 | cruise control switch | 7308 |
| 37 | switch module (at the steering wheel) | CV00 |
| 38 | Fuel additive ECU | 1282 |
| 39 | additive tank | --- |
| 40 | low additive level sensor | 1283 |
| 41 | additive injection pump | 1283 |
| 42 | fuel tank | -- |
| 43 | additive injector | 1284 |
| 44 | booster pump (low pressure) | 1211 |
| 45 | electric fuel heater | 1276 |
| 46 | engine coolant temperature sensor | 1220 |
| 47 | plug (overflow) | -- |
| 48 | safety valve | --- |
| 49 | fuel tank cap presence sensor (*) | 4320 |
| 50 | centralised diagnostic socket | C001 |
| 51 | battery | BB00 |
| 52 | injection double relay (engine relay unit) | BSM |
| 53 | vehicle speed sensor | 1620 |
| 54 | accelerator pedal position sensor | 1261 |
| 55 | clutch pedal switch | 7306 |
| 56 | brake pedal switch | 2100 |
| 57 | pre-post heat box | 1150 |
| 58 | fuel cooler | -- |
| 59 | fuel filter | -- |
| 60 | engine speed sensor | 1313 |
| 61 | camshaft position sensor | 1115 |
| 62 | pre-heater plugs | 1160 |
| 63 | fuel high pressure common injection rail | -- |
| 64 | high pressure fuel sensor | 1321 |
| 65 | fuel temperature sensor | 1310 |
| 66 | high pressure fuel regulator | 1322 |
| 67 | high pressure fuel pump | -- |
| 68 | 3rd piston deactivator on the high pressure fuel pump | 1277 |
| 69 | diesel injectors | 1331 - 1332 - 1333 - 1334 |
| 70 | "Swirl" control electrovalve | 1264 |
| 71 | "Swirl" control diaphragm | -- |
| 72 | inlet air heater throttle | -- |
| 73 | throttle butterfly housing (EGR) | -- |
| 74 | air/air heat exchanger | -- |
| 75 | throttle housing control electrovalve (EGR) | 1263 |
| 76 | inlet manifold pressure sensor | 1312 |
Note(*) according to specification
Particle filter
Role
The particle filter traps carbon particles as the exhaust gases pass through
Description
"a": carbon particles
"b": cerine
"c": filtered exhaust gases
"d": porous ceramic walls
"e": stainless steel casing
"f": thermal insulator
The particle filter is a porous structure of silicon carbide including channels arranged so as to force the exhaust gases to pass through the walls
Components retained in the particle filter
- Carbon particles
- Cerine
- Deposits from the engine oil and engine wear
Essentially consisting of carbon and hydrocarbons, these particles on the particle filter burn in the presence of oxygen at a temperature of 550°C (natural regeneration or with the assistance of post injection)
Cerine is an inorganic material which does not burn and is retained in the particle filter in the form of a solid deposit
The accumulation of particles whilst the engine is operating leads to the progressive clogging up of the particle filter
WarningThe particle filter must be replaced or cleaned every 80 000 km (in order to remove components retained in the filter). refer to chapter: maintenance
Location
The particle filter is incorporated into the exhaust pipe (downstream of the catalytic converter)
Catalytic converter
Role
The catalytic converter is used to increase the temperature of the exhaust gases, through post combustion of the unburned hydrocarbons (HC) from post injection
Description
Composition of an oxidation catalytic converter
- A stainless steel casing
- A thermic insulator
- A ceramic honeycomb core impregnated with precious metals
Location
The catalytic converter is located between the decoupler and the particle filter
Exhaust gas temperature sensor (upstream of the catalytic converter) (1344)
Role
The temperature sensor informs the injection ECU of the temperature of the exhaust gases (upstream of the catalytic converter)
Description
The sensor consists of a Negative Temperature Coefficient (NTC) resistor
The more the temperature increases, the more its resistance value is reduced
Electrical special features
Allocation of channels of connector
- Terminal 1: 5 Volts
- Terminal 2: earth
Resistance at 100 °C = 96 000 ohms
Resistance at 450 °C = 762 ohms
WarningThe electrical information provided by the upstream temperature sensor is transmitted directly to the injection ECU
Location
The temperature sensor is located upstream of the catalytic converter
The temperature sensor is screwed onto a base plate
WarningObserve the tightening torque
Exhaust gas temperature sensor (downstream of the catalytic converter) (1343)
Role
The temperature sensor informs the injection ECU of the temperature of the exhaust gases (downstream of the catalytic converter)
Description
The downstream temperature sensor is identical to the upstream temperature sensor
Electrical special features
WarningThe electrical information provided by the downstream temperature sensor is transmitted by wire to the additive ECU and sent to the injection ECU on the multiplexed networks
Location
The temperature sensor is located between the catalytic converter and the particle filter
Differential pressure sensor (1341)
Role
The sensor permanently measures the pressure difference of the exhaust gases between the inlet and the outlet of the particle filter to determine the condition of the filter (clogging or deterioration problems of the filter)
Description
"g": HI: particle filter upstream information input (diameter 4,32 mm)
"h": REF: particle filter downstream information input (diameter 4,32 mm)
"j": white marking
"k": electrical connector
"l": diaphragm
The sensor consists of the following components
- Electronics to amplify the signal
- A sealed membrane
The membrane is subject to the following pressures
- The inlet pressure of the particle filter (upstream)
- The outlet pressure of the particle filter (downstream)
The sensor provides a voltage proportional to the differential pressure measured by the membrane (delta P = P upstream - P downstream)
WarningDo not invert the upstream and downstream information pipes (the filtration system will not work). management of the particle filter depends on this information
Electrical special features
Allocation of channels of connector
- Terminal 1: pressure information (0,5 to 5 volts)
- Terminal 2: earth
- Terminal 3: 5 volts supply
Voltage supplied for a differential pressure of 0 bar: + 0,5 Volts (engine off)
Voltage supplied for a differential pressure of 0,9 bar: + 4,1 Volts (particle filter clogged)
Location
"j": white marking
The sensor (9) is located on the bulkhead (according to vehicle)
Air temperature sensor (1310)
The air temperature sensor informs the ECU of the temperature of the air admitted
WarningThe air temperature sensor is incorporated in the air flow sensor
The role of the injection ECU in terms of the information received: to regulate the inlet air temperature (control of the inlet air heater throttle electrovalve)
NoteWhen a fault is present on the air temperature sensor (1310), the ECU uses a replacement value of 50°C
NoteThe external air temperature sensor (6415) located on the door mirror is used by the ECU to perform coherence tests. the external air sensor is controlled by the front right hand door station (9050)
Water-to-air heat exchanger (inlet air heating)
Role
The water/air heat exchanger heats the air let into the cylinders (during the particle filter regeneration assistance phase)
Heating the inlet air allows the combustion temperature required to regenerate the particle filter to be increased
Description
The air/air heat exchanger which cools the air let into the cylinders, is shaped around a water/air exchanger, which heats the inlet air
Location
(15) water-to-air heat exchanger (inlet air heating)
(74) air/air heat exchanger
The water/air heat exchanger (15) is located near to the front air/air heat exchanger (74)
Inlet air heater throttle
Description
WarningThe inlet air heater throttle is closed when it is not controlled pneumatically
Location
The throttle housing is located at the inlet to the inlet manifold
Throttle housing control electrovalve (inlet air heating) (1285)
Role
The electrovalve controls the opening of the inlet air heater throttle
Description
The electrovalve is identical to the following electrovalves
- Turbocharging pressure regulation solenoid valve
- Exhaust gas recycling solenoid valve (EGR)
- Throttle housing control electrovalve (EGR)
"m": "user" outlet
"n": pressure drop inlet for the vacuum pump
"p": white marking
"q": atmospheric pressure inlet
The solenoid control is an OCR (Opening Cyclical Ratio) type control
The proportional electrovalve controlled by an OCR voltage is connected to the following components
- Atmospheric pressure
- Vacuum supplied by the vacuum pump
The pressure supplied by the electrovalve is included between the atmospheric pressure and the vacuum pump vacuum
The electrovalve connects the vacuum pump and the heater throttle
Operating phases with particle filter regeneration assistance
- Engine at low load and mid-load: the inlet air heater throttle is open (controlled)
- Engine full load: the inlet air heater throttle is closed (not controlled) (in moderate atmosphere)
NoteOutside the regeneration assistance operating phase the inlet air heater throttle can be controlled (engine cold, moderate ambient temperature)
Electrical special features
Control: injection ECU (earth)
Variable voltage control (OCR)
- Full supply (maximum OCR) = maximum vacuum
- No supply (minimum OCR) = no vacuum (atmospheric pressure)
NoteOCR: opening cyclic ratio
Location
(17) inlet air heater throttle control electrovalve
The electrovalve is located in the engine compartment
Throttle housing control electrovalve (EGR) (1263)
Role
The electrovalve controls the closing of the throttle housing (EGR)
Description
WarningThe throttle housing is open when it is not controlled pneumatically
Operating phases with particle filter regeneration assistance
- Engine at low load: the throttle housing is closed (controlled) (**) (depending on external temperature)
- Engine at mid-load and full load: the throttle housing is open (not controlled)
(**) the engine only lets in heated air
Built-in systems interface (BSI1)
Role
The BSI is used to perform the following operations
- To transmit information from the fuel additive ECU to the injection ECU
- To transmit information from the injection ECU to the fuel additive ECU
- To inform the driver of the condition of the pollutant particle filtration system
- To reinitialise the system after a maintenance operation
Flow chart
A - VAN network
B - CAN network
C - wire connection
(BSI1) built-in systems interface
(1282) Fuel additive ECU
(1320) injection ECU
| no. of link | signal | nature of signal |
|---|---|---|
| 77 | operating status of the additive ECU | CAN |
| minimum additive level reached warning | CAN | |
| total amount of additive injected since the beginning of the particle filter's life | CAN | |
| exhaust gas temperature (downstream of the catalytic converter) | CAN | |
| request to force the fan (at normal speed) | CAN | |
| request to force the pre-post heating plugs | CAN | |
| 78 | request to illuminate the diagnostic LED | VAN |
| particulate emission filter fault | CAN | |
| request to activate consumers (alternator saturation) | CAN | |
| request to force the fan (at medium speed) | CAN | |
| engine speed sensor signal (engine running information) | CAN | |
| 79 | pre-post heating unit control pre-heater plugs | all or nothing |
| 80 | cooling fan relay control (at normal speed) | all or nothing |
| 81 | cooling fan relay control (at medium speed) | all or nothing |
| 82 | heated rear screen relay control | all or nothing |
| 83 | request to illuminate the diagnostic LED | VAN |
| request to flash the service LED on the control panel (*) | VAN | |
| request to display a message on the multifunction screen (*) | VAN | |
| 84 | operating status of the additive ECU | VAN |
| minimum additive level reached warning | VAN | |
| total amount of additive injected since the beginning of the particle filter's life | VAN | |
| status of the fuel filler cap presence sensor | VAN | |
| exhaust gas temperature (downstream of the catalytic converter) | VAN | |
| 85 | engine speed sensor signal (engine running information) | VAN |
| fuel gauge information | VAN | |
| position of the ignition key | VAN | |
| vehicle speed information | VAN | |
| 86 | fuel tank cap presence sensor | all or nothing |
| 87 | exhaust gas temperature (downstream of the catalytic converter) | analogue |
| 88 | fuel gauge | analogue |
| 89 | ignition key | all or nothing |
(*) according to equipment
Injection ECU (1320)
Role
The ECU software integrates
- Check functionalities of injection and pollution control
- The particle filter regeneration control
- Driving improvement strategies
- Emergency strategies
- Fan unit and warning lamp operating management (*)
- The diagnostic with memorisation of failures
- The dialogue with the fuel additive ECU
- The dialogue with the automatic gearbox ECU (*)
- The dialogue with the stability control ECU (*)
(*) according to equipment
Description
The ECU ensures the electrical control of the following elements
- Differential pressure sensor
- Exhaust gas temperature sensor (upstream of the catalytic converter)
- Inlet air heater throttle control electrovalve