GF07.16-P-6000OG CDI Control Unit, Component Description
GF07.16-P-6000OG CDI Control Unit, Component Description
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
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 in MODEL 218.323
ENGINES 642.856 in MODEL 212.089 /289
ENGINES 642.858 in MODEL 212.093
Shown on model 212.0 from the front left
N3/9 CDI control unit
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
- Glow system control
- Injection quantity control
- Diagnosis and fault storage
- 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 system and respective output signals are issued:
^ Direct input signals
^ Direct output signals
^ LIN signals
^ CAN input signals
^ CAN output signals
Direct input signals
- Terminal 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)
- Right hot film mass air flow sensor (B2/7)
- Right intake air temperature sensor (B2/7b1)
- Rail pressure sensor (/)B4/6
- Boost pressure sensor (B5/1)
- Camshaft Hall sensor (B6/1)
- Coolant temperature sensor (B11/4)
- Exhaust gas recirculation temperature sensor (B16/14) (with code (U42) BlueTec (SCR) diesel exhaust treatment)
- Temperature sensor upstream of SCR catalytic converter (B16/15) (with code (U42) BlueTEC (SCR) diesel exhaust treatment)
- Charge air temperature sensor (B17/8)
- 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) (with code (U41) Fuel/water separator and lubrication package or code (U42) BlueTec (SCR) diesel exhaust treatment and code (494) USA version)
- Right hand and left hand intake port shutoff end position sensor (B96/1, B96/2) (with code (U42) BlueTec (SCR) diesel exhaust treatment and code (494) USA version)
- Oxygen sensor upstream of catalytic converter (G3/2)
- 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 positioner (Y77/1)
- Radiator shutters actuator (Y84) (model 204, 212)
- Exhaust gas recirculation cooler bypass switchover valve (Y85)
- Quantity control valve (Y94)
- Fuel system control unit (N118) (model 204.0/2/9, model 207.3 as of 12/2009, model 207.4, 212.0 as of 09/2009, model 212.2, model 218.3) - 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
CAN input signals
Instrument cluster (A1)
- Fuel reserve signal
Supplemental restraint system control unit (N2/10) (model 204, 207, 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
The Electronic Stability Program control unit (N30/4) will be used as of 1.3.2011 (model 204.0/2) in 2 variants:
- Electronic Stability Program control unit, basis variant (except code (233) DISTRONIC PLUS)
- Electronic Stability Program control unit, Premium variant (except code (233) DISTRONIC PLUS)
Until 28.2.2011 (model 204.0/2) or 31.5.2011 (model 204.9) and as of 1.6.2011 (model 204.9) only the basic variant of the Electronic Stability Program control unit will be used.
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 207.3/4 with code (233) DISTRONIC PLUS, model 212.0/2 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) (model 207.3/4, 212.0/2 as of 1.6.10, model 204.0/2 as of 1.6.11, model 218 with code (233) DISTRONIC PLUS or code (237) Active Blind Spot Assist or code (238) Active Lane Keeping Assist
- Engine torque request
Electronic ignition lock control unit (N73)
- Start enable (drive authorization system)
Fuel system control unit (N118)
- Fuel pressure
- Self-diagnosis data
- Requested diagnostic data
AdBlue(R) control unit (N118/5) (with code (U42) BlueTEC (SCR) diesel exhaust treatment)
- Reduction agent quantity to be injected for NO X reduction
- Reduction agent quantity to be injected for cooling the AdBlue(R) metering valve (Y129)
- Fill level status in the AdBlue(R) 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
- Transmission limp-home mode
CAN output signals
Instrument cluster (A1)
- Engine oil level too low
- Circuit 61 signal (generated by CDI control unit)
- 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))
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 system control unit (N118)
- Fuel pump ON
- Specified fuel pressure
- Diagnosis request
AdBlue(R) 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
- Shift request
- Engine torque
- Engine coolant temperature
- Engine oil temperature
- Engine speed
- Engine load
- Kickdown
- Engine speed limitation active
- Engine control limp-home mode
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.
Power 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.
Power 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).
Processor run-on
When the CDI control unit receives the signal "circuit 15 OFF", a processor 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 processor 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.
