- Fuel supply.
- Control of glow plugs when starting the engine and while driving.
- Controlling the amount of fuel supplied when starting the engine and while driving.
- Management of emissions of harmful substances.
- Boost pressure control.
- Control of compressor stop (A9) of air conditioner (in various operating modes to preserve the battery)
- Engine stop control.
- System diagnostics according to EOBD 2 standard
The control unit controls the following elements of the system.
- Starter relay (K40/9k5).
- Fuel pump relay (K40/9k6).
- Fuel injection pump (M41).
- Output stage for glow plug control (N14/2).
- Heating element ventilation line (R39/1).
- Exhaust gas recirculation actuator (Y27) for engines with codes MF4 and MF8.
- Converter of the boost pressure control system (Y31/5).
- Fuel pressure control valve (Y74).
- Fuel injector 1st cylinder (Y76y1).
- Fuel injector 2nd cylinder (Y76y2)
- Fuel injector 3rd cylinder (Y76y3)
- Fuel injector 4th cylinder (Y76y4)
- Air supply system shut-off valve (Y83), for engines with code MF4.
- Fuel quantity control valve (Y94).
During system operation, the control unit receives information from the following system elements.
- Air flow sensor (by mass) (B2/5) for engines with code MF4.
- Fuel pressure sensor in the high pressure fuel pump (B4/6).
- Boost pressure sensor (B5/1).
- Camshaft position sensor (B6/1).
- -Coolant temperature sensor (B11/4).
- Charge air temperature sensor (B17/9).
- Air filter outlet pressure sensor (828/5).
- Accelerator pedal sensor (B37/3).
- Universal oil condition sensor (B40).
- Fuel temperature sensor (B50).
- Fuel filter water level sensor (B76) for engines with code KL5 (fuel filter with moisture separator).
- Oxygen sensor (02) TWC (CAT) (G3/2) for engines with code MF4.
- Crankshaft position sensor (L5).
- Clutch pedal position switch sensor (S40/3) for vehicles with manual transmission 716.6.
The CAN C multiplex network enables communication between the CDI unit (N3/9) and the following systems and their components.
- Instrument cluster (A1).
- SRS airbag control unit (N₂ /10).
- eTC system control unit (EGS) (N15/3) for vehicles with automatic transmission 722.6.
- Electronic gear selector control unit (N15/5) for vehicles with automatic transmission 722.6
- ESP traction control unit (N30/4).
- Air conditioning system control unit EIS (EZS) (N73).
The CDI ECU input/output signal validity monitoring systems (N3/9) generate replacement signals in emergency mode if any signal is not received due to unreliability.