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

ENGINES 651.961 in MODEL 221.0/1 

Location 

The CDI control unit is on the air filter housing.

Task 

The CDI control unit operates in an electrical network of sensors and actuators to form the engine control system for engine 651.

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)
• DAS (FBS) 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 

• Terminal 15
• Circuit 30 (fused)
• Circuit 31
• Circuit 87
• Knock sensor 1, on the right (A16/1)
• Knock sensor 2, on the left (A16/2)
• Oil temperature sensor (B1)
• Hot film mass air flow sensor (B2/5)
• Intake air temperature sensor (B2/5b1)
• Rail pressure sensor (B4/6)
• Charge pressure sensor (B5/1)
• Low-pressure turbocharger boost pressure sensor (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) (for code (474) Particulate filter)
• Temperature sensor upstream of turbocharger (B19/11) (for code (474) Particulate filter)
• Pressure sensor downstream of air filter (B28/5)
• Pressure differential sensor (DPF) (B28/8) (for code (474) Particulate filter)
• 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)
• O2 sensor upstream of CAT (G3/2)
• Engine and air conditioning electric suction fan with integrated control (M4/7), diagnostic data
• Actual value potentiometer 1 (M16/6r1) throttle valve
• Crash signal from the restraint system control unit (N2/7)
• Oil level check switch (S43)

Direct output signals 

• O2 sensor upstream of CAT, O2 sensor heater
• Throttle valve actuator (M16/6)
• Intake port shutoff motor (M55)
• Circuit 15 relay (N10/1kJ)
• Circuit 50 relay, starter (N10/1kH)
• Circuit 87 relay, engine (N10/1kC)
• Fuel pump control unit (N118) - fuel pump ON ground signal
• Vent line heater element (R39/1)
• Two-disk thermostat heating element (R48)
• Engine and air conditioning electric suction fan with integrated control - specified speed of the fan
• Accelerator pedal sensor - reference ground of potentiometers 1 and 2
• Left exhaust gas recirculation positioner (Y27/9)
• Boost pressure control transducer (Y31/5)
• Pressure regulator valve (Y74)
• Cylinder 1 fuel injector (Y76y1)
• Cylinder 2 fuel injector (Y76y2)
• Cylinder 3 fuel injector (Y76y3)
• Cylinder 4 fuel injector (Y76y4)
• Radiator shutters actuator (Y84)
• EGR [AGR] cooler bypass flap switchover valve (Y85)
• Pressure transducer exhaust flap (Y93)
• Quantity control valve (Y94)
• Left switchable engine mount (Y123)
• Right switchable engine mount (Y123/1)
• Engine oil pump valve (Y130)
• Coolant pump switchover valve (Y133)
• Fuel pump relay (N10/2kS) as of 06/11 for actuation of the A/C compressor magnetic clutch (A9y1)

LIN signals 

• Alternator interface via drive LIN (LIN C1)
• Alternator (G2)
• Glow time output stage (N14/3) - actuation of various glow functions and transmission of system errors, heating element actuation and signal for the fuel filter condensation level - condensation sensor with heating element (B76/1)

CAN input signals 

Instrument cluster (A1) 

• Fuel reserve signal

Restraint systems control unit (N2/7) 

• Crash signal

AAC control unit (N22/1) 

• Specified fan speed request
• Air conditioning, status
• Request for actuation of A/C compressor magnetic clutch (as of 06/11)

ESP control unit (N47-5) 

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

AIRMATIC with ADS control unit (N51) (except CODE (487) Active Body Control (ABC) and except CODE (Z07) Highest protection) 

• Engine start request
• Engine stop prohibition

Video and radar sensor system control unit (N62/2) (for code (233) DISTRONIC PLUS, code (237) Active Blind Spot Assist and code (238) Active Lane Keeping Assist) 

• Engine torque request

EIS [EZS] control unit (N73) 

• Start enable (drive authorization system)

Steering column tube module (N80) 

• Steering wheel angle
• Steering wheel angular velocity

Fuel system control unit (N118) 

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

Electric controller unit (VGS) (Y3/8) 

• 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) 

• 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))

EIS [EZS] control unit (N73) 

• Start enable request (drive authorization system)

Fuel system control unit (N118) 

• Fuel pump ON
• Specified fuel pressure
• Diagnosis request

Electric controller unit (VGS) (Y3/8) 

• 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 supplied with a voltage for ignition ON by "circuit 87". 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 consists of several ground lines to the electronic ground (LH footwell) (W34/1).

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).

Variants 

The engine control variants, such as country and exhaust gas variants, are activated with the Diagnosis Assistance System (DAS) using the variant coding function.

Replacement of the CDI control unit is not necessary.

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.

	Wiring diagram for common rail diesel injection (CDI) control unit	N3/9	Engine plug	PE07.16-P-2101-97SAH
		N3/9	Vehicle plug	PE07.16-P-2101-97SAG