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

ENGINES 642.830 in MODEL 204.025 /225 

ENGINES 642.832 in MODEL 204.092 /292 /992 

ENGINES 642.834 in MODEL 204.023 /223 

ENGINES 642.835 in MODEL 204.093 

ENGINES 642.836 in MODEL 207.322 /422 

ENGINES 642.838 in MODEL 207.323 /423 

ENGINES 642.850 in MODEL 212.020 /024 /025 /220 /224 /225 

ENGINES 642.852 in MODEL 212.023 /223 

ENGINES 642.853 /854 in MODEL 218 

ENGINES 642.856 in MODEL 212.089 /289 

ENGINES 642.858 in MODEL 212.093 /293 

Shown on model 212.0 from the front left 

Location 

The CDI control unit is installed in the wheel arch at the front right behind the wheel.

Task 

The CDI control unit operates in an electrical network of sensors and actuators to form the engine control system for engine 642.8.

The following systems and functions are controlled and coordinated by the CDI control unit according to input signals:

• Fuel supply
• Preglow system control
• Injection quantity control
• Diagnosis and fault storage
• Engine timing start stop function (for code (B03) ECO start/stop function)
• Drive authorization system and immobilizer
• Heat management
• Torque interface
• Alternator interface
• Exhaust gas recirculation
• Emission control

The CDI control unit has an internal atmospheric pressure sensor.

Input and output signals 

The following input signals are evaluated by the engine control and issued in the respective output signals:

• Direct input signals 
• Direct output signals 
• LIN signals 
• CAN input signals 
• CAN output signals 

Direct input signals 

• Circuit 15
• Circuit 30 (fused)
• Circuit 31
• Circuit 87M1
• Oil temperature sensor (B1)
• Left hot film mass air flow sensor (B2/6)
• Left intake air temperature sensor (B2/6b1) (model 212), left intake air temperature sensor (B2/6b1) (model 204, model 207, model 218)
• Right hot film mass air flow sensor (B2/7)
• Right intake air temperature sensor (B2/7b1) (model 204, model 207, model 212, right intake air temperature sensor (model 218))
• Rail pressure sensor (B4/6)
• Boost pressure sensor (B5/1)
• Camshaft Hall sensor (B6/1)
• Coolant temperature sensor (B11/4) (model 204, model 207, model 212), coolant temperature sensor (B11/4) (model 218)
• Exhaust gas recirculation temperature sensor (B16/14) (with code (U42) Blue TEC diesel exhaust treatment (SCR) and code (494) USA version)
• Charge air temperature sensor (B17/8)
• Temperature sensor upstream of SCR catalytic converter (B16/15) (with code (U42) BlueTEC (SCR) diesel exhaust treatment)
• Temperature sensor upstream of diesel particulate filter (B19/9) (with code (474) Particulate filter)
• Temperature sensor upstream of turbocharger (B19/11)
• Pressure sensor downstream of air filter (B28/5)
• DPF differential pressure sensor (B28/8) (with code (474) Particulate filter)
• DPF differential pressure sensor for OBD (B28/16) (with code (U42) BlueTEC (SCR) diesel exhaust treatment and code (494) USA version)
• Accelerator pedal sensor (B37) - potentiometer 1
• Accelerator pedal sensor - potentiometer 2
• Fuel temperature sensor (B50)
• Exhaust back pressure sensor (B60)
• Crankshaft Hall sensor (B70)
• Fuel filter condensation sensor with heating element (B76/1)
• Oxygen sensor upstream of catalytic converter (G3/2)
• Left and right intake port shutoff Hall sensor (B96/1, B96/2) (with code (U42) Blue TEC diesel exhaust treatment (SCR) and code (494) USA version)
• Exhaust gas recirculation bypass flap Hall sensor (B90) (with code (U42) Blue TEC diesel exhaust treatment (SCR) and code (494) USA version)
• Oil level check switch (S43)
• Combustion engine and air conditioning fan motor with integrated control (M4/7), diagnostic data
• Glow plugs (R9)

Direct output signals 

• Oxygen sensor upstream of catalytic converter - oxygen sensor heater
• Throttle valve actuator (M16/6)
• Intake port shutoff actuator motor (M55)
• Fuel pump relay (N10/2kD) (for model 207.3 up to 11/2009 and for model 212.0 up to 08/2009)
• Circuit 15 relay (N10/1kJ)
• Circuit 50 starter relay (N10/1kM)
• Engine circuit 87 relay (N10/1kN)
• Vent line heater element ()R39/1
• Condensation sensor for fuel filter with heating element
• Combustion engine and air conditioning fan motor with integrated control - specified fan speed
• Accelerator pedal sensor - reference masses for potentiometer 1 and 2
• 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)
• Cylinder 5 fuel injector (Y76/5)
• Cylinder 6 fuel injector (Y76/6)
• Boost pressure regulator (Y77/1)
• Exhaust gas recirculation cooler bypass switchover valve (Y85)
• Quantity control valve (Y94)
• Fuel system control unit (N118) (model 204, model 207.3 as of 12/2009, model 207.4, 212.0 as of 09/2009, model 212.2, model 218) - fuel pump ground signal ON

LIN signals 

• Alternator interface via drive LIN (LIN C1)
• Alternator (G2)
• Glow output stage (N14/3), to control various glow functions and send system errors
  • Fuel filter condensation sensor with heating element actuation heating element and condensation status sensor (as of 06/10)

CAN input signals 

Instrument cluster (A1) 

• Fuel reserve signal

Supplemental restraint system control unit (N2/10) (model 204, model 207, model 212), supplemental restraint system control unit (N2/10) (model 218) 

• Crash signal

Automatic air conditioning control and operating unit (N22/7) 

• Specified fan speed request
• Air conditioning, status

Electronic Stability Program control unit (N30/4) (except code (233) DISTRONIC PLUS) or Electronic Stability Program Premium control unit (N30/7) (with code (233) DISTRONIC PLUS) 

• Vehicle speed
• Wheel speed signal
• Brake recognition
• Cruise control request
• Engine torque request

Nitrogen oxides control unit downstream of the diesel particulate filter (N37/7) (with code (U42) BlueTEC (SCR) diesel exhaust treatment) 

• NOx concentration in the exhaust
• O₂ concentration in the exhaust

Nitrogen oxides control unit downstream of the SCR catalytic (N37/8) converter (with code (U42) BlueTEC (SCR) diesel exhaust treatment) 

• NOx concentration in the exhaust
• O₂ concentration in the exhaust

Radar sensor control unit (N62/1) (model 207 up to 31.5.11 with code (233) DISTRONIC PLUS, model 212 up to 31.5.10 with code (233) DISTRONIC PLUS or code (234) Blind spot assist) 

• Engine torque request

Video and radar sensor control unit (N62/2) (with code (233) DISTRONIC PLUS or with code (237) Active Blind Spot Assist or with code (238) Active Lane Keeping Assist) (model 204 as of 1.6.11, model 207 as of 1.6.11, model 212 as of 1.6.10, model 218) 

• Engine torque request

Left front door control unit (N69/1) 

• Driver door closed

Upper control panel control unit (N72/1) 

• ECO start/stop function button (N72/1s50) status

Electronic ignition lock control unit (N73) 

• Start enable (drive authorization system)

Steering column module control unit (N80) 

• Steering wheel angle
• Steering wheel angle speed

Fuel pump control unit (N118) (model 204, model 207.3 as of 12/2009, model 207.4, 212.0 as of 09/2009, model 212.2, model 218) 

• Fuel pressure
• Self-diagnosis data
• Requested diagnostic data

AdBlue® control unit (N118/5) (with code (U42) BlueTec (SCR) diesel exhaust treatment 

• Reduction agent quantity to be injected for NOx reduction
• Reduction agent quantity to be injected for cooling the AdBlue® metering valve (Y129)
• Fill level status in the AdBlue® tank
• Requested diagnostic data

Fully integrated transmission control controller unit (Y3/8) (with code (427) 7-speed automatic transmission) 

• Drive position
• Transmission mode
• Actual gear, target gear
• Engine torque reduction request
• Starter enable in selector lever position "P, N"
• Engine idle specified speed (for actuation of the torque converter lockup clutch)
• Status of torque converter lockup clutch
• Emergency transmission limp-home mode

CAN output signals 

Instrument cluster (A1) 

• Fuel consumption (the trip computer is informed about the current fuel consumption by means of square-wave pulse packages (1 pulse = 0.2 l/h))
• Engine oil level too low
• Circuit 61 signal (generated by CDI control unit)

Nitrogen oxides control unit downstream of the diesel particulate filter (N37/7) (with code (U42) BlueTEC (SCR) diesel exhaust treatment) 

• Diagnosis request

Nitrogen oxides control unit downstream of the SCR catalytic (N37/8) converter (with code (U42) BlueTEC (SCR) diesel exhaust treatment) 

• Diagnosis request

Electronic ignition lock control unit (N73) 

• Start enable request (drive authorization system)

Fuel pump control unit (N118) (model 204, model 207.3 as of 12/2009, model 207.4, 212.0 as of 09/2009, model 212.2, model 218) 

• Fuel pump ON
• Specified fuel pressure
• Diagnosis request

AdBlue® control unit (N118/5) (with code (U42) BlueTec (SCR) diesel exhaust treatment 

• Request for reduction agent injection
• Specification of the reduction agent quantity to be injected
• Specification of the run-on period of the control units
• Diagnosis request

Fully integrated transmission control controller unit (Y3/8) (with code (427) 7-speed automatic transmission) 

• Requests for catalytic converter heating
• Switching request
• Engine torque
• Engine coolant temperature
• Engine oil temperature
• Engine speed
• Engine load
• Kickdown
• Engine speed limitation active
• Limp-home mode engine control

Design 

The housing of the CDI control unit is made of die-cast aluminum and the cover is made of corrosion-proof sheet steel. The CDI control unit is water proof and dust proof.

The housing contains the 32-bit measuring and control electronics for the engine control.

Voltage supply 

The CDI control unit is "circuit 30 fused" and also energized by "circuit 87 M1" when the ignition is switched on. In the operating voltage range it has both short-circuit protection and reversed polarity protection.

Voltage is supplied through several pins connected in parallel to relieve the electrical connectors.

Ground connection 

The "circuit 31" ground connection is made via several ground lines to the left major assembly compartment electronics ground point (W16/5).

Computer run-on 

When the CDI control unit receives the signal "circuit 15 OFF", a computer run-on of approx. 4 seconds is started.

However, it may also last for several minutes due to various functions (for example, on-board diagnosis (OBD), drive authorization system (DAS), thermal management).

Assembly operations 

Ensure before unplugging the plug on the CDI control unit that the ignition is switched off and computer run-on has ended.

This is to prevent damage to the CDI control unit and save errors in the control units linked to the CAN.

Variants 

The engine control variants (e.g. national and exhaust variants) are activated with Xentry Diagnostics using the variant coding function. Replacement of the CDI control unit is not necessary.