Components common with the document: "Operating Principle - HDI direct injection system (High Pressure Diesel Direct Injection)"
Components common with the document
- High pressure fuel pump
- 3rd piston deactivator on the high pressure fuel pump (1277)
- High pressure fuel regulator (1322)
- Fuel high pressure common injection rail
- Battery (BB00)
- Injection double relay (1304)
- Accelerator pedal sensor (1261)
- Engine speed sensor (1313)
- The camshaft position sensor (1115)
- Engine coolant temperature sensor (1220)
- Air temperature sensor (1310)
- Fuel temperature sensor (1221)
- High pressure fuel sensor (1321)
- Vehicle speed sensor (1620)
- Brake switch (2100)
- Feature of the diesel injector control
Special parts
Features of the DW12 TED4 engine
- Injection ECU (1320)
- Diesel injectors (1331, 1332, 1333, 1334)
Injection double relay (BSM) - special feature
The double relay is incorporated into the engine relay unit
(1) double relay
Engine coolant temperature sensor (1220) - special feature
Role
The engine coolant temperature sensor informs the ECU about the engine coolant temperature
The role of the injection ECU in terms of the information received
- To adjust the pre-heating time
- To adjust the postheating time
- To adjust the starting flow
- Adjust the idling speed
- To authorise exhaust gas recycling (EGR)
- To adjust the fuel flow
- To limit the flow injected if the temperature of the coolant is critical (anti-boil function)
- To operate the fans
- To operate the logometer on the control panel (*)
- To operate the warning and prewarning lights (*)
Note(*) according to specification
Description
2-way green sensor
The sensor consists of a Negative Temperature Coefficient (NTC) resistor
The more the temperature increases, the more its resistance value is reduced
Location
(2) engine coolant temperature sensor
The water temperature sensor is fitted to the coolant unit
There are 2 assembly possibilities
Metal coolant outlet housing
- The coolant temperature sensor is screwed in
- It is sealed with a copper seal
Plastic coolant outlet housing
- The coolant temperature sensor is secured by a plastic clip
- It is sealed with an O-ring
Fuel temperature sensor (1221) - special feature
Role
The role of the injection ECU in terms of the information received
- To adjust the fuel flow
- To calculate the fuel density
Description
(3) fuel temperature sensor
The sensor consists of a Negative Temperature Coefficient (NTC) resistor
The more the temperature increases, the more its resistance value is reduced
- Resistance at 20 °C = 3323 ohms
- Resistance at 80 °C = 287 ohms
Location
The fuel temperature sensor measures the fuel temperature directly on the return to tank circuit (return housing)
Brake switch (2100) - special feature
Role
The switch ensures the injection ECU provides good driving pleasure
The electrical information provided by the brake switch is transmitted by wire to the BSI and sent to the injection ECU on the multiplexed network (*)
(*) according to specification
Location
The brake switch is located on the pedal
Redundant brake pedal switch (7308) - special feature
Role
The switch ensures the injection ECU provides good driving pleasure
The information from the brake switches is constantly compared with each other in order to detect any faults
Location
The brake switch is located on the pedal
Clutch switch (7306) - special feature
Role
The clutch switch allows the injection ECU to perform the driven idle function
Location
The clutch switch is located on the pedal set
Vehicle speed sensor - special feature
The vehicle speed information is transmitted by the ABS ECU on the multiplexed networks
(1320) injection ECU - special feature
Role
The ECU controls the whole injection system
The ECU software integrates
- Check functionalities of injection and pollution control
- Driving improvement strategies
- Engine immobiliser function
- Emergency strategies
- Fan unit and warning lamp operating management (*)
- Control of coolant heater systems for the heat exchanger (*)
- The diagnostic with memorisation of failures
- The cruise control function (*)
- Dialogue with all of the ECUs on the multiplexed networks (*)
Note(*) according to specification
The ECU ensures the electrical control of the following elements
- Diesel injectors
- Turbocharging pressure regulation solenoid valve
- High pressure fuel regulator
- Recycling regulation electrovalve (EGR)
- Throttle housing control electrovalve (EGR)
- Pre and post-heating control unit (post-heating cut-off)
- 3rd piston deactivator on the high pressure fuel pump
- "Swirl" control electrovalve
The ECU supplies the following information
- Engine speed: to the instrument panel
- Current consumption: to the on-board ECU
- Air conditioning cut-off
- Coolant heater operation authorisation (depending on the version)
The atmospheric pressure sensor can not be separated from the injection ECU
The ECU contains a power stage which can supply the very high control current required for the diesel injectors to operate
The injection ECU is connected to the injection harness by a 88-way connector
The injection ECU software is updated by downloading (ECU fitted with a flash EPROM)
Allocation of channels of connector
| channel No. | designation |
|---|---|
| 1 | +12 volts supply (after double relay) (BSM) |
| 2 | output: injector No 1 control |
| 3 | output: injector No 3 control |
| 4 | output: injector No 4 control |
| 5 | output: injector No 2 control |
| 6 | output: injector No 2 control |
| 7 | --- |
| 8 | diagnostic line for the coils of the fan unit control relays |
| 9 | dialogue line: CAN H network |
| 10 | --- |
| 11 | input: air temperature sensor (flow meter) |
| 12 | supply: camshaft position sensor differential pressure sensor |
| 13 | input: air flow signal (flow meter) |
| 14 | input: engine speed sensor signal |
| 15 | input: accelerator pedal sensor signal |
| 16 | --- |
| 17 | --- |
| 18 | input: camshaft sensor signal |
| 19 | --- |
| 20 | --- |
| 21 | input: clutch switch |
| 22 | sensors earth |
| 23 | --- |
| 24 | output: "Swirl" control electrovalve |
| 25 | output: control of fan unit group 1 (high speed) |
| 26 | output: turbocharging pressure regulation solenoid valve |
| 27 | earth: differential pressure sensor |
| 28 | output: inlet air heater throttle control electrovalve |
| 29 | +12 volts supply (after double relay) (BSM) |
| 30 | output: injector No 1 control |
| 31 | output: injector No 3 control |
| 32 | output: injector No 4 control |
| 33 | earth |
| 34 | sensors earth |
| 35 | --- |
| 36 | engine immobiliser serial line (*) |
| 37 | dialogue line: CAN L network |
| 38 | line K diagnosis |
| 39 | input: fuel temperature sensor |
| 40 | earth: camshaft position sensor |
| 41 | input: engine speed sensor signal |
| 42 | input: differential pressure sensor |
| 43 | --- |
| 44 | supply to sensors (5 volts) |
| 45 | earth: engine coolant temperature sensor |
| 46 | input: engine coolant temperature information |
| 47 | --- |
| 48 | brake lights switch |
| 49 | earth |
| 50 | --- |
| 51 | earth |
| 52 | output: recycling electrovalve control (EGR) |
| 53 | earth |
| 54 | --- |
| 55 | output: throttle housing electrovalve control (EGR) |
| 56 | --- |
| 57 | output: control of fan unit group: average speed (*) |
| 58 | output 1: control of additional heating 1 |
| 59 | --- |
| 60 | output: high pressure fuel regulator |
| 61 | --- |
| 62 | --- |
| 63 | --- |
| 64 | --- |
| 65 | --- |
| 66 | --- |
| 67 | input: pre-heater control unit diagnostic |
| 68 | input: accelerator pedal sensor |
| 69 | after ignition +: engine fuse box (BSM) |
| 70 | input: exhaust gas temperature sensor (upstream of the catalytic converter) |
| 71 | input: inlet manifold air pressure |
| 72 | --- |
| 73 | input: cruise control switch |
| 74 | input: fuel pressure |
| 75 | air conditioning pressostat (26 bar control stage) |
| 76 | --- |
| 77 | --- |
| 78 | --- |
| 79 | --- |
| 80 | output: 3rd piston deactivator on the high pressure fuel pump |
| 81 | --- |
| 82 | --- |
| 83 | output: control of fan unit group 2 (low speed) |
| 84 | --- |
| 85 | output 2: control of additional heating 2 |
| 86 | output: double relay control (BSM) |
| 87 | input: inertia switch (earthed) |
| 88 | output: control for pre-heating unit |
Note(*) according to specification