Component description for the CDI control unit

P07.16-3028-01

N3/9 CDI control unit

Location

The CDI control unit is built into the engine compartment at the left in front of the windshield.

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 actuates the CDI functions:

- Fuel supply

- Glow functions

- Injection control

- Exhaust gas cleaning

- Boost pressure control

- Refrigerant compressor switch-off (A9)

- Shutoff control

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

Input and output signals

Signal inputs and outputs

Direct input signals

- Circuit 30

- Circuit 31

- Circuit 87

- Oil sensor (oil level, temperature and grade) (B40)

- Left hot film mass air flow sensor (B2/6)

- Intake air temperature sensor (B2/6b1)

- Right hot film mass air flow sensor (B2/7)

- Intake air temperature sensor (B2/7b1)

- Rail pressure sensor (B4/6/)

- Charge pressure sensor (B5/1)

- Camshaft Hall sensor (B6/1)

- Coolant temperature sensor (B11/4)

- Charge air temperature sensor (B17/8)

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- Left catalytic converter exhaust gas temperature sensor (B16/4)

- Right catalytic converter exhaust gas temperature sensor (B16/5)

- Temperature sensor upstream of left turbocharger (B16/9)

- Temperature sensor upstream of right turbocharger (B16/10)

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

- Left pressure differential sensor (DPF) (B28/12), (with code (474) Particulate filter)

- Right pressure differential sensor (DPF) (B28/13), (with code (474) Particulate filter)

- Accelerator pedal sensor (B37)

- Fuel temperature sensor (B50)

- Left exhaust back pressure sensor (B60/1)

- Right exhaust back pressure sensor (B60/2)

- Crankshaft Hall sensor (B70)

- Left O2 sensor upstream of catalytic converter (G3/3)

- Right O2 sensor upstream of catalytic converter (G3/4)

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Direct output signals

- Heater for oxygen sensors downstream of catalytic converter

- Throttle valve actuator (M16/6)

- Intake port shutoff motor (M55)

- Circuit 50 relay, starter (N10/1kH)

- Fuel pump relay (N10/2kS)

- Vent line heater element (R39/1)

- LH exhaust gas recirculation positioner (Y27/9)

- Right exhaust gas recirculation positioner (Y27/10)

- Pressure regulator valve (Y74)

- Fuel injectors (Y76)

- EGR [AGR] cooler bypass flap switchover valve (Y85)

- Left boost pressure positioner (Y100)

- RH boost pressure adjuster (Y100/1)

- Quantity control valve (Y94)

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Chassis CAN signals

- ESP control unit (N47-5)

- EIS [EZS] control unit (N73)

- Central gateway control unit (N93)

- Gear selector switch DIRECT SELECT (S16/13), over steering column module (N80)

Central CAN signals

- Instrument cluster (A1)

Drive train CAN signals

- Control unit for fully integrated transmission control (Y3/8n4)

Drive LIN signals

- Alternator (G2)

- Glow output stage (N14/3)