Component description for CDI control unit - GF07.16-P-6000GZ

ENGINE 642 in MODEL 164.8 /1 up to model year 2008/YoM 07 

ENGINE 642 in MODEL 463 up to 31.5.12 

Shown on model 164.1 

Location 

The CDI control unit is installed in the direction of travel at the right in the front wheel well between the fender and the sidewall.

Task 

The CDI control unit has the following tasks:

• Reading in of sensors, pickups and signals 
• Evaluating input factors 
• Control of functions and systems 
• Actuating components 

Reading in of sensors, pickups and signals 

The input factors are read in via the following connections:

• Direct line 
• Drive train LIN (LIN C1) 
• Drive train CAN (CAN C) 
• Drive train sensor CAN (CAN I) (for engine 642.886) 

Direct line 

The signals from the following sensors are read via direct lines:

• Oil temperature sensor (B1)
• 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)
• Temperature sensor upstream of SCR catalytic converter (B16/15) (on engine 642.8)
• Charge air temperature sensor (B17/8)
• Temperature sensor upstream of catalytic converter (B19/7) (model 164 with code (474) Particulate filter)

  Temperature sensor upstream of catalytic converter (B19/7) (model 463 with engine 642.8)

• Temperature sensor upstream of diesel particulate filter (B19/9) (model 463, on model 164 with code (474) Particulate filter)
• Temperature sensor upstream of turbocharger (B19/11) (model 164)

  Temperature sensor upstream of turbocharger (B19/11) (model 463)

• Pressure sensor downstream of air filter (B28/5) (model 164)

  Pressure sensor downstream of air filter, right cylinder bank (B28/5) (model 463)

• Pressure differential sensor (DPF) (B28/8) (model 164 with code (474) Particulate filter)

  Pressure differential sensor (CAT) (B28/8) (model 463)

• Accelerator pedal sensor (B37)
• Fuel temperature sensor (B50)
• Exhaust back pressure sensor (B60)
• Crankshaft Hall sensor (B70)
• O2 sensor upstream of CAT (G3/2)
• Oil level check switch (S43)
• Fuel filter water level sensor (B76) (on vehicles with code (494) USA version)

Drive train LIN 

The CDI control unit communicates with the following components via the drive LIN:

• Alternator (G2)
• Glow time output stage (N14/3)

The glow time output stage sends the status of the fuel filter condensation sensor with heating element (B76/1).

Drive train CAN 

The CDI control unit receives the following information via the drive train CAN:

• Circuit status, circuit 15, circuit 50 and start enable (drive authorization system) from EIS control unit (N73)
• Vehicle speed from instrument cluster (A1)
• Fuel reserve from instrument cluster
• Crash signal from the restraint system control unit (N2/7)

• Nominal fan speed request, outside temperature and status of air conditioning from AAC control and operating unit (N22) via interior CAN (CAN B), EIS control unit and drive train CAN
• Wheel speed signals, brake recognition, engine torque request from ESP control unit (N47-5) (model 164)

  ESP and BAS control unit (N47-5) (model 463 up to 31.8.08)

  ESP control unit (N30/4) (model 463 as of 1.9.08)

• Transmission control status information from fully integrated transmission control unit (VGS) (Y3/8n4)

Drive train sensor CAN (on model 463 with engine 642.886) 

The CDI control unit receives the following information via the drive train sensor CAN:

• Nitrogen oxide concentration in exhaust from nitrogen oxide control unit downstream of diesel particulate filter (N37/7) and from nitrogen oxide control unit downstream of SCR catalytic converter (N37/8)
• AdBlue® exhaust treatment status information from AdBlue® control unit (N118/5)

Evaluation of input factors 

The input factors are evaluated by the microprocessor and the corresponding components are actuated.

Control of functions and systems 

The CDI control unit controls the following functions and systems depending on the information received:

• Fuel supply
• Preglow system
• Injection quantity control
• Charge pressure control
• Diagnosis and fault storage
• Drive authorization system and immobilizer
• Heat management
• Torque interface
• Alternator interface
• Exhaust gas recirculation
• Emission control

Component actuation 

The actuation of the components takes place via the following connections:

• Direct line 
• Drive train LIN 
• Drive train CAN 
• Drive train sensor CAN (on model 463 with engine 642.886) 

Direct line 

The CDI control unit then actuates the following components via direct lines:

• Accelerator pedal sensor, reference ground of potentiometers 1 and 2
• O2 sensor upstream of catalytic converter, oxygen sensor heater
• Relay, circuit 15 (F58kH) (model 164), relay, circuit 15 (N10/1kP) (model 463)
• Relay, circuit 87, engine (F58kD) (model 164), relay, circuit 87, engine (N10/1kR) (model 463)
• Starter (M1) via starter relay (F58kI) (model 164), Starter relay (N10/2kS) (model 463)
• Fuel pump (M3) via fuel pump relay (F4kO) (model 164), fuel pump relay (N10/2kA) (model 463)
• Combustion engine and air conditioning fan motor with integrated control, specified fan speed\\
• Throttle valve actuator (M16/6)
• Intake port shutoff motor (M55)
• Vent line heater element (R39/1)
• Left exhaust gas recirculation positioner (Y27/9)
• Pressure regulator valve (Y74)
• Fuel injectors (Y76)
• Boost pressure regulator (Y77/1)
• Quantity control valve (Y94)

Drive train LIN 

The CDI control unit then actuates the following components via drive train LIN:

• Alternator Excitation current alternator
• Glow time output stage, preheat setting, actuation of heating element in fuel filter condensation sensor with heating element

Drive train CAN 

The CDI control unit sends the following data via the drive train CAN:

• Engine control status information and circuit status of circuit 61, etc. to the instrument cluster
• Start enable request (drive operation system) to EIS control unit

Drive train sensor CAN (on model 463 with engine 642.886) 

The CDI control unit sends the following data via the drive train sensor CAN:

• Diagnostic requests to the nitrogen oxide control unit downstream of the diesel particulate filter and to the nitrogen oxide control unit downstream of the SCR catalytic converter
• Request for exhaust treatment and diagnostic requests to AdBlue® control unit

The CDI control unit has a fault memory which can be read out with the diagnostic tester.