Description
(1) engine ECU
"a" 53-way black connector (CH)
"b" 53-way brown connector (CMI)
"c" 48-way grey connector (CME)
Make: BOSCH
Role
The engine management ECU manages the entire injection system
The engine management ECU software incorporates
- Check functionalities of injection and pollution control
- Driving improvement strategies
- Engine immobiliser function
- Emergency strategies
- Fan unit and warning lamp operating management (*)
- The diagnostic with memorisation of failures
- The cruise control and speed limiter function (*)
The engine management ECU manages the electrical control of the following components
- Diesel injectors
- Fuel flow regulator
- Turbocharger solenoid valve
- Exhaust heat saver electrovalve (*)
- Pre and post-heating control unit
- Electric diesel fuel heater
- Oil vapours electric heater (blow by) (*)
- Exhaust gas recycling valve
The atmospheric pressure sensor cannot be separated from the engine ECU
The engine management ECU has 2 power stages which are able to supply the very high control current necessary for the operation of the diesel injectors
Note(*) according to version
Electrical features
53-way black connector (CH)
| channel number | allocation of channels of connector |
|---|---|
| 1 | engine ECU power supply input |
| 2 | engine ECU supply input |
| 3 | earth |
| 4 | earth |
| 5 | engine ECU supply input |
| 6 | engine ECU power supply input |
| 7 | additional heating control signal 1 |
| 8 | channel not connected |
| 9 | acquisition of ignition key position |
| 10 | engine running information |
| 11 | power relay control output |
| 12 | cooling fan control output 2 |
| 13 | cooling fan control output 1 |
| 14 | channel not connected |
| 15 | channel not connected |
| 16 | additional heating control signal 2 |
| 17 | channel not connected |
| 18 | engine ECU power supply input |
| 19 | remote-controlled wake-up line (RCD) |
| 20 (*) | supply of the power steering pressure sensor |
| 21 (*) | supply of the air conditioning fluid pressure sensor (+ 5 volts) |
| 22 | brake pedal secondary switch signal input |
| 23 (*) | power steering pressure sensor signal input |
| 24 | channel not connected |
| 25 | channel not connected |
| 26 | cooling fan diagnostic information |
| 27 | channel not connected |
| 28 | main relay control output |
| 29 | channel not connected |
| 30 | engine ECU power supply input |
| 31 | channel not connected |
| 32 | channel not connected |
| 33 (*) | aircon fluid pressure sensor signal input |
| 34 | accelerator pedal position sensor signal input n°2 |
| 35 | accelerator pedal position sensor signal input n°1 |
| 36 | accelerator pedal tight spot switch signal input |
| 37 | LIN 1 |
| 38 | channel not connected |
| 39 | clutch switch signal input |
| 40 | Intersystem CAN High |
| 41 | channel not connected |
| 42 | channel not connected |
| 43 | channel not connected |
| 44 | accelerator pedal position sensor earth 2 |
| 45 (*) | refrigerant pressure sensor earth power steering pressure sensor earth |
| 46 | supply of the accelerator pedal position sensor (+ 5 V) |
| 47 | accelerator pedal position sensor earth 1 |
| 48 | channel not connected |
| 49 | channel not connected |
| 50 | channel not connected |
| 51 | channel not connected |
| 52 | Intersystem CAN Low |
| 53 | earth |
53-way brown connector (CMI)
| channel number | allocation of channels of connector |
|---|---|
| 1 | channel not connected |
| 2 | fuel pump control |
| 3 | channel not connected |
| 4 | Turbo-charging pressure solenoid valve command |
| 5 | diesel heater supply supply of the blow-by reheater (*) |
| 6 | channel not connected |
| 7 | pre-post heating unit control |
| 8 | channel not connected |
| 9 | supply of the engine speed sensor (+ 5 volts) |
| 10 | channel not connected |
| 11 | channel not connected |
| 12 | channel not connected |
| 13 | channel not connected |
| 14 | intake air temperature signal |
| 15 | inlet air temperature sensor earth |
| 16 | channel not connected |
| 17 | battery+ supply of the air flowmeter sensor |
| 18 | channel not connected |
| 19 | channel not connected |
| 20 | channel not connected |
| 21 | channel not connected |
| 22 | channel not connected |
| 23 | diesel fuel temperature sensor signal input |
| 24 | diesel fuel temperature sensor earth |
| 25 | inlet air pressure sensor signal |
| 26 | inlet air temperature and pressure sensor earth |
| 27 | engine speed sensor signal input |
| 28 | earth of the engine r.p.m sensor |
| 29 | power supply + battery of the following components: fuel high pressure injection pump; proportional electrovalve controlling the fixed geometry turbocharger |
| 30 | channel not connected |
| 31 | channel not connected |
| 32 | channel not connected |
| 33 | air flowmeter sensor earth |
| 34 | flowmeter air temperature signal |
| 35 | diesel fuel high pressure sensor signal input |
| 36 | earth of the diesel fuel high pressure sensor |
| 37 | channel not connected |
| 38 | channel not connected |
| 39 | channel not connected |
| 40 | engine oil pressure switch signal input |
| 41 | water in diesel sensor battery + supply |
| 42 | channel not connected |
| 43 | channel not connected |
| 44 | channel not connected |
| 45 | oil temperature sensor signal input |
| 46 | channel not connected |
| 47 | sensor + 5V supply (diesel high pressure sensor) |
| 48 | channel not connected |
| 49 | channel not connected |
| 50 | inlet air temperature and pressure sensor + 5 V supply |
| 51 | engine coolant temperature sensor signal input |
| 52 | engine coolant temperature sensor earth |
| 53 | channel not connected |
48-way grey connector (CME)
| channel number | allocation of channels of connector |
|---|---|
| A1 | channel not connected |
| A2 | turbocharger position copy sensor supply (+ 5 V) |
| A3 | channel not connected |
| A4 | channel not connected |
| B1 | + 5 V supply of the EGR valve position repeat sensor |
| B2 | turbocharger position copy sensor signal input |
| B3 | EGR valve position copy sensor signal input |
| B4 | channel not connected |
| C1 | channel not connected |
| C2 | turbocharger position copy sensor earth |
| C3 | exhaust gas recycling (EGR) valve position copy sensor earth |
| C4 | channel not connected |
| D1 | channel not connected |
| D2 | supply of cylinder reference sensor (+ 5V) |
| D3 | cylinder reference sensor signal input |
| D4 | channel not connected |
| E1 | channel not connected |
| E2 | channel not connected |
| E3 | cylinder reference sensor earth |
| E4 | water-in-diesel-fuel sensor information input |
| F1 | channel not connected |
| F2 | pre-post heating diagnostic information |
| F3 (*) | alternator charge information |
| F4 | channel not connected |
| G1 | channel not connected |
| G2 | channel not connected |
| G3 | channel not connected |
| G4 | channel not connected |
| H1 | channel not connected |
| H2 | channel not connected |
| H3 | channel not connected |
| H4 | control - of the EGR valve motor |
| J1 | air flowmeter sensor signal input |
| J2 | channel not connected |
| J3 | channel not connected |
| J4 | control + of the EGR valve motor |
| K1 | channel not connected |
| K2 | channel not connected |
| K3 | channel not connected |
| K4 | channel not connected |
| L1 | control output +: diesel injector 4 |
| L2 | control output +: diesel injector 2 |
| L3 | control output -: diesel injector 4 |
| L4 | control output -: diesel injector 2 |
| M1 | control output +: diesel injector 1 |
| M2 | control output +: diesel injector 3 |
| M3 | control output -: diesel injector 1 |
| M4 | control output -: diesel injector 3 |
Programming/initialisation
The engine management ECU software is updated by downloading (ECU fitted with a flash EPROM)