Component description for CDI control unit

P07.16-3367-06

N3/9 CDI control unit

Location

The CDI control unit is on the air filter housing.

 The bottom side of the CDI control unit projects into the air filter housing. The control unit is cooled by the drawn-in air.

Task

The tasks of the CDI control unit are subdivided into the following partial tasks:

 Controlling of the common rail diesel injection (CDI) function

 Input and output signals

Control of CDI function

The CDI control unit controls the following CDI functions:

- Fuel supply

- Glow functions

- Injection control

- Exhaust gas cleaning

- Boost pressure control

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- Refrigerant compressor cutout (A9)

- Shutoff control

 The CDI control unit is equipped with a fault memory, which can be read out via STAR DIAGNOSIS.

 The CDI control unit has an internal atmospheric pressure sensor.

Input and output signals

Signal inputs and outputs

Direct input signals

- Cylinder 3+4 knock sensor (A16/1)

- Cylinder 1+2 knock sensor (A16/4)

- Oil temperature sensor (B1)

- Hot film MAF sensor (B2/5)

- Intake air temperature sensor (B2/5b1)

- Rail pressure sensor (B4/6)

- Boost pressure sensor (B5/1)

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- Boost pressure sensor downstream of low-pressure turbocharger (B5/4)

- Camshaft Hall sensor (B6/1)

- Coolant temperature sensor (B11/4)

- Charge air temperature sensor (B17/8)

- Temperature sensor upstream of diesel particulate filter (B19/9), on vehicles with code (474) Particulate filter

- Temperature sensor upstream of turbocharger (B19/11)

- Pressure sensor downstream of air filter (B28/5)

- Pressure differential sensor DPF (B28/8), on vehicles with code (474) Particulate filter

- Oil level check switch (S43)

- Accelerator pedal sensor (B37)

- Fuel temperature sensor (B50)

- Exhaust back pressure sensor (B60)

- Fuel filter condensation sensor with heating element (B76/1), on vehicles with code (U41) Fuel/water separator and lubrication package

- Crankshaft position sensor (L5)

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- Oxygen sensor upstream of catalytic converter (G3/2)

- Supplemental restraint system control unit (N2/10), crash signal

Direct output signals

- Heater for oxygen sensor upstream of catalytic converter

- Throttle valve actuator (M16/6)

- Intake port shutoff actuator motor (M55)

- Engine circuit 87 relay (N10/1kN)

- Vent line heater element (R39/1)

- Fuel pump relay (N10/2kD)

- Coolant thermostat heating element (R48)

- Coolant pump switchover valve (Y133)

- Charge air bypass flap switchover valve (Y132)

- Wastegate control pressure transducer (Y31/4)

- Boost pressure control flap pressure transducer (Y93)

- Starter circuit 50 relay (N10/1kM)

- Combustion engine fan motor and air conditioning system with integrated control (M4/7)

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- Exhaust gas recirculation actuator (Y27/9)

- Pressure regulator valve (Y74)

- Cylinder 1 fuel injector (Y76/1)

- Cylinder 2 fuel injector (Y76/2)

- Cylinder 3 fuel injector (Y76/3)

- Cylinder 4 fuel injector (Y76/4)

- Exhaust gas recirculation cooler bypass switchover valve (Y85)

- Quantity control valve (Y94)

- Oil spray nozzle shutoff valve (Y131)

Chassis CAN (CAN E) signals

- Instrument cluster (A1)

- Electronic Stability Program control unit (N30/4)

- Electronic ignition lock control unit (N73)

- Front SAM control unit with fuse and relay module (/)N10/1

Drive train CAN (CAN C) signals

- Electronic transmission control control unit (N15/3) (with transmission 722.6)

- Electronic selector lever module control unit (N15/5) (with transmission 722.6)

Drive LIN (LIN C1) signals

- Alternator (G2)

- Glow output stage (N14/3)