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Component Description For CDI Control Unit - GF07.16-P-6000OLF

ENGINE 651.9 as of 6/1/15 in MODEL 166 as of model year 2016 

View of engine from front left 

Fig 1: CDI Control Unit Component Location - Engine 651.9 As Of 6/1/15 In Model 166 As Of Model Year 2016
G12080656Courtesy of MERCEDES-BENZ USA

Location 

The CDI control unit is on the air filter housing.

Tasks 

The CDI control unit performs the following tasks:

The CDI control unit also acts as the interface (gateway) between the three connected CAN bus systems.

Controlling the engine basic functions 

Reading in of signals 

Input factors are read in over the following connections:

Evaluation of input factors 

The input factors that have been read in are evaluated by the integrated microprocessor and the affected components are then actuated.

IMPORTANT The electronic ignition lock control unit (N73) is the central interface (Gateway) for exchanging the function-relevant data of the control units that are connected to the various CAN bus systems.

Output of signals and actuation of components 

Initial parameter are output over the following connections:

Body 

The housing of the CDI control unit is made of diecast aluminum and the cover is made of corrosion-proof sheet steel. The CDI control unit is water proof and dust proof. The inside contains the 32-bit measuring and control electronics for the engine management.

IMPORTANT The CDI control unit has an internal atmospheric pressure sensor.

Power supply 

The CDI control unit is supplied with power by "circuit 30 fused" and, with the ignition on, by "circuit 87". In the operating voltage range it has both short-circuit protection and reversed polarity protection. Power is supplied through several engaged parallel pins connected in parallel to relieve the electrical connections.

Variants 

The variants of the engine management, for exampled country and exhaust variants, are activated with XD over the variant coding.

IMPORTANT Assembly operations

Ensure before unplugging the connector 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.

Input factors and initial parameters for the following components are read in or output over direct lines by the CDI control unit and are needed by the engine management:

Input factors over a direct line Initial parameters over a direct line Supplemental information
Terminal 15 - -
Circuit 30 (fused) - -
Circuit 31 - -
Circuit 87 (M4) - -
Engine oil temperature sensor (B1) - -
Hot film MAF sensor (B2/5) - -
Intake air temperature sensor (B2/5b1) - -
- high pressure fuel pressure sensor (B4/6) - Fuel high-pressure circuit
Boost pressure sensor (B5/1) - -
Low-pressure turbocharger boost pressure sensor (B5/4) - -
Camshaft Hall sensor (B6/1) - -
Coolant temperature sensor (B11/4) - -
Exhaust gas recirculation temperature sensor (B16/14) - With CODE 494 (USA version)
Temperature sensor upstream of SCR catalytic converter (B16/15) - With CODE U77 (BLUETEC (SCR) diesel exhaust treatment)
Charge air temperature sensor (B17/8) - -
Temperature sensor upstream of charge air cooler (B17/11) - With CODE 494 (USA version)
Temperature sensor upstream of catalytic converter (B19/7) - With CODE U77 (BLUETEC (SCR) diesel exhaust treatment)
Temperature sensor upstream of diesel particulate filter (B19/9) - With code 474 (Particulate filter)
Temperature sensor upstream of ATL (B19/11) - -
Pressure sensor downstream of air filter (B28/5) - -
DPF differential pressure sensor (B28/8) - With code 474 (Particulate filter)
Accelerator pedal sensor (B37) Accelerator pedal sensor (B37) -
Fuel temperature sensor (B50) - -
Exhaust pressure sensor (B60) - -
Crankshaft Hall sensor (B70) - -
Exhaust gas recirculation cooling bypass flap Hall sensor (B90) - With CODE 494 (USA version)
Coolant pump temperature sensor (B107) - With CODE 494 (USA version)
- Starter circuit 50 relay (F58kM) -
Circuit relay 87M (F58kN) Circuit relay 87M (F58kN) -
- Circuit 15 relay (F58kR) -
Oxygen sensor upstream of catalytic converter (G3/2) Oxygen sensor upstream of catalytic converter (G3/2) -
Fan motor (M4/7) Fan motor (M4/7) -
Actuator motor (M16/6m1) Actual value potentiometer 1 (M16/6r1) -
- Intake port shutoff actuator motor (M55) -
Supplemental Restraint System control unit (N2/10) - -
- Fuel system control unit (N118) -
- Vent line heater element (R39/1) -
- Coolant thermostat heating element (R48) Except CODE 494 (USA version)
Oil level check switch (S43) - -
- Exhaust gas recirculation actuator (Y27/9) -
- Boost pressure control pressure transducer (Y31/5) -
- Pressure regulating 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) -
- Radiator shutters actuator (Y84) Except CODE 550 (trailer hitch)
- Exhaust gas recirculation cooler bypass switchover valve (Y85) -
- Boost pressure control flap pressure transducer (Y93) -
- Quantity control valve (Y94) -
- Left switchable engine mount (Y123) and right switchable engine mount (Y123/1) -
- Engine oil pump valve (Y130) -
- Oil spray nozzle shutoff valve (Y131) -
- Coolant pump switchover valve (Y133) -

Input and initial parameters for the following components and control units are transmitted or received by the CDI control unit via the LIN or CAN and are needed by the engine management system:

Input factors via the drive-LIN (LIN C1) Initial parameters via the drive-LIN (LIN C1) Supplemental information
Alternator (G2) Alternator (G2) -
Glow output stage (N14/3) Glow output stage (N14/3) -
Input factors via the drive train CAN (CAN C) Initial parameter via the drive train CAN (CAN C) Supplemental information
Fuel system control unit (N118) Fuel system control unit (N118) -
Fully integrated transmission control unit (Y3/8n4) Fully integrated transmission control unit (Y3/8n4) -
Input factors via chassis CAN 1 (CAN E1) Initial parameters via chassis CAN 1 (CAN E1) Supplemental information
Instrument cluster (A1) Instrument cluster (A1) Via chassis CAN 2 (CAN E2) and the electronic ignition lock control unit (N73)
Supplemental Restraint System control unit (N2/10) - -
SAM control unit (N10) - Via interior CAN (CAN B) and the electronic ignition lock control unit (N73)
AAC control and operating unit (N22/7) - Via interior CAN (CAN B) and the electronic ignition lock control unit (N73)
Electronic Stability Program control unit (N30/4) - -
AIRmatic control unit (N51/3) - -
Radar sensors control unit (N62/1) (with CODE 23P (Driving assistance package Plus)) - Via chassis FlexRay (Flex E) and chassis gateway control unit (N93/7)
Left front door control unit (N69/1) - Via interior CAN (CAN B) and the electronic ignition lock control unit (N73)
Upper control panel control unit (N72/1) - over the battery sensor LINE (LINE B15) to the SAM control unit (N10) and via the interior CAN (CAN B) and electronic ignition lock control unit (N73)
Electronic ignition lock control unit (N73) Electronic ignition lock control unit (N73) -
Steering column tube module control unit (N80) - -
Diagnostic connector (X11/4) Diagnostic connector (X11/4) via diagnostic CAN (CAN D) and the electronic ignition lock control unit (N73)
Input factors via drive train sensor CAN (CAN I) Initial parameters via drive train sensor CAN (CAN I) Supplemental information
NOx sensor control unit downstream of diesel particulate filter (N37/7) NOx sensor control unit downstream of diesel particulate filter (N37/7) With CODE U77 (BLUETEC (SCR) diesel exhaust treatment)
NOx sensor control unit downstream of SCR catalytic converter (N37/8) NOx sensor control unit downstream of SCR catalytic converter (N37/8) With CODE U77 (BLUETEC (SCR) diesel exhaust treatment)
AdBlue® control unit (N118/5) AdBlue® control unit (N118/5) With CODE U77 (BLUETEC (SCR) diesel exhaust treatment)

Body 

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

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

IMPORTANT

The CDI control unit has an internal atmospheric pressure sensor.

Ground connection 

The ground connection "circuit 31" is made over a number of ground lines to the front right ground point for lamp unit (W2).

Power supply 

The CDI control unit is supplied with power by "circuit 30 fused" and, with the ignition on, by "circuit 87". In the operating voltage range it has both short-circuit protection and reversed polarity protection. Power is supplied through several engaged parallel pins connected in parallel to relieve the electrical connections.

Variants 

The variants of the engine management, for exampled country and exhaust variants, are activated with XD over the variant coding.

IMPORTANT Assembly operations

Ensure before unplugging the connector 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.

Designation Unit Values Tolerance range Remarks
CDI control unit (N3/9)         
Load stress V 13.5    
Voltage limits V 4...8    
Power consumption A 19   Operating current
  mA 100   Circuit 30 no-load current
Pole reverse protection       Yes
Additional specific parameters       None
Special features       None
Flashability/codablity       Yes/yes
Engine oil temperature sensor (B1)         
Model       NTC resistor (Negative temperature coefficient)
Supply voltage V 5 ± 5%  
Resistor (series resistor) Ω 1470 ± 1%  
Resistor Ω 3086.57   at 20°C
    174.34   At 100 °C
Hot film MAF sensor (B2/5)         
Model       Unknown
Operating voltage range V 7.5...16    
Power consumption A < 0.1    
Sensor measuring range kg/h 0...750    
Cycle duration μs 67...510    
Intake air temperature sensor (B2/5b1)         
Basic frequency range Hz Unknown    
Resistor Ω 9202   at -10°C
    5774   at 0°C
    2448   at 20°C
    1150   at 40°C
    182   At 100°C
- high pressure fuel pressure sensor (B4/6)         
Supply voltage V 5    
Power consumption mA < 15    
Pressure range bar 0...2200    
Sensor voltage V 0.1   For 0 bar
    0, 9   For 2200 bar
Resistance (pull-up resistor) 2, 2 ± 1%  
Operating temperature °C -40...140    
Boost pressure sensor (B5/1)         
Supply voltage V 5    
Pressure measurement range bar 0.1...1.2    
Power consumption mA < 10    
Cut-off frequency kHz > 2    
Signal voltage V 0.1   For 100 hPa
    0.9   For 1200 hPa
Low-pressure turbocharger boost pressure sensor (B5/4)         
Supply voltage V 5    
Pressure measurement range bar 0, 1...1, 2    
Power consumption mA < 10    
Cut-off frequency kHz > 2    
Signal voltage V 0.1   For 100 hPa
    0.9   For 1200 hPa
Camshaft Hall sensor (B6/1)         
Supply voltage V 4.7...18    
Power consumption mA < 10    
Switching threshold V Unknown    
Signal voltage V 0...18    
Signal current mA 0...20    
Mechanical installation distance mm 0.2...1.8    
Rpm rpm 0...4500   From camshaft
Coolant temperature sensor (B11/4)         
Model       NTC resistor
Supply voltage V 3, 3   Via CDI control unit
Resistor Ω 3140, 4   at 20°C
    174.9   At 100°C
Sensor voltage V 2.664   at 20°C
    0, 624   At 100°C
Exhaust gas recirculation temperature sensor (B16/14) (with code (494) USA version)         
Model       PTC resistance (Positive Temperature Coefficient)
Sensor voltage V 0.83   at 0°C
Temperature sensor upstream of SCR catalytic converter (B16/15) (with code U77 (BlueTEC (SCR) diesel exhaust treatment))         
Model       PTC resistor
Sensor voltage V 0.83   at 0°C
  V 1.08   At 100°C
Charge air temperature sensor (B17/8)         
Model       NTC resistor
Supply voltage V 5 ± 5% Via CDI control unit
Resistor (series resistor) Ω 1780 ± 1%  
Resistor Ω 6189, 4   at 20°C
    453.1   at 90°C
Sensor voltage V 3, 836   at 20°C
    0.993   at 90°C
Temperature sensor upstream of catalytic converter (B19/7) (with CODE U77 (BLUETEC (SCR) diesel exhaust treatment))         
Model       PTC resistor
Sensor voltage V 0, 83   at 0°C
  V 1.08   At 100°C
Temperature sensor upstream of diesel particulate filter (B19/9)        With code 474 (Particulate filter)
Model       PTC resistance (Positive Temperature Coefficient)
Resistor (series resistor) Ω 1000 ± 1%  
Supply voltage V 5 ± 5% Via CDI control unit
Resistor Ω 200, 00   at 0°C
    766.31   at 850°C
Sensor voltage V 1.319   at 50°C
    1.466   At 100°C
Temperature sensor upstream of ATL (B19/11)         
Model       PTC resistor
Resistor (series resistor) Ω 1000 ± 1%  
Supply voltage V 5 ± 5% Via CDI control unit
Resistor Ω 200, 00   at 0°C
    617.30   at 600°C
    848, 70   at 1000°C
Sensor voltage V 1.157   at 0°C
    2, 679   at 850°C
Pressure sensor downstream of air filter (B28/5)         
Supply voltage V 5    
Resistor (pull-down resistor) 100 ± 5% To the ground connection
Pressure range bar 0.1...1.2    
Signal voltage V 0.1...0.9   Linear
Operating temperature °C -40...125    
DPF differential pressure sensor (B28/8)        With code 474 (Particulate filter)
Supply voltage V 5    
Power consumption mA 12    
Resistance (pull-up resistor) 68 ± 10%  
Pressure range bar 0.5...4.0    
Signal voltage V 0.1...4.9    
Accelerator pedal sensor (B37)         
Supply voltage for accelerator pedal sensor V 5 0.5%  
Power consumption mA Unknown    
Signal voltage signal 1 V 0.045...0.944    
Signal voltage signal 2 V 0, 0225...0, 472    
Signal voltage signal 1 (wide open throttle without kickdown) V 0, 81    
Signal voltage signal 2 (wide open throttle without kickdown) V 0.405    
Signal voltage signal 1 (wide open throttle with kickdown) V 0.876...0.944    
Signal voltage signal 2 (wide open throttle with kickdown) V 0, 436...0, 472    
Fuel temperature sensor (B50)         
Model       NTC resistor
Supply voltage V 5 ± 5% Via CDI control unit
Resistor (series resistor) Ω 1500 ± 1%  
Resistor Ω 2812.70   at 20°C
    560.50   at 60°C
Sensor voltage V Unknown   at 20°C
    Unknown   at 60°C
Exhaust pressure sensor (B60)         
Supply voltage V 5    
Resistor 100   To the ground connection
Pressure range bar 0...5    
Signal voltage V 0.1...0.9   Linear
Crankshaft Hall sensor (B70)         
Supply voltage V 4, 75...5, 25    
Power consumption mA max. 13    
Fuel filter condensation sensor with heating element (B76/1)         
Resistor 10 ± 5%  
Supply voltage V 9 to 16    
Nominal power consumption mA 8...20    
Exhaust gas recirculation cooling bypass flap Hall sensor (B90) (with code (494) USA version)         
Supply voltage V 5    
Coolant pump temperature sensor (B107) (with code 494 USA version))         
Model       NTC resistor
Sensor voltage   V 3.56 at 25°C
    V 0, 74 At 100°C
Oxygen sensor upstream of catalytic converter (G3/2)         
Model       Wide-band oxygen sensor (LSU 4.9)
Average pump current μA 20    
Maximum pump current μA 800    
Pump cycle duration ms 400    
Internal resistance Ω 100    
Power consumption of the oxygen sensor heater A 2, 1   at -40°C
    0.5   Warm condition
Fan motor (M4/7)         
Rated voltage V 12    
Load stress V 9 to 16    
Throttle valve actuator (M16/6)         
Rated voltage V 12    
Load stress V 6...18    
Power consumption A 1.5...9.5    
Sensor supply voltage V 5    
Resistance (pull-up resistor) 10    
Frequency pulse width modulated signal Hz 2000    
Duty cycle, pulse width modulated signal % 10...90    
Operating temperature °C -40...120    
Intake port shutoff actuator motor (M55)         
Supply voltage V 12    
Nominal power consumption A 1, 3    
Frequency pulse width modulated signal Hz 2000    
Circuit resistance Ω 3.35    
Output stage protection (current limitation) A Unknown    
Output stage protection (time limitation) s Unknown    
Glow output stage (N14/3)         
Load stress V 14    
Voltage limits V 6...16    
Operating current for glow output stage mA < 135   Terminal 87
  A < 160   Circuit 30
Preheat "ON" °C -40...1300   Glow plug temperature
Operating current per output A ca. 40   Begin push phase
    ca. 8   End push phase
  s approx. 2.5   Period of the push phase
  A approx. 7   Characteristics map glowing pulse width modulated signal
No-load current μA < 500   Circuit 30
Glow plugs (R9)         
Rated voltage V 4.6    
Power consumption (per glow plug) A 35   at -40°C
Power consumption (per glow plug) A 5...8   After approx. 4 s:
Resistor Ω 0.4...0.5   For approx. 20°C
Basic frequency (PWM actuation) Hz 30, 5    
Vent line heater element (R39/1)         
Rated voltage V 12    
Load stress V 12...15   Full function
    6...12/15...18   Limited function
Power consumption A < 1.9 A   At 15 V, -40°C...0°C
    < 1.0 A   For 15 V, 25°C
Resistor Ω 8...14   At -40°C...0°C
Coolant thermostat heating element (R48) (except code 494 (USA version))         
Rated voltage V 13, 5    
Load stress V < 16    
Operating current A ≤ 1.9    
Resistor Ω 9.5 ± 1  
Operating temperature °C -40...135    
Oil level check switch (S43)         
Model       With reed contact
Resistor 2.61   In the CDI control unit
Power supply (resistor) V 5    
Power consumption (resistor) mA ca. 2    
Exhaust gas recirculation actuator (Y27/9)         
Rated voltage V 12    
Load stress V 10.8...16    
Power consumption (max.) A < 7.5   Short-term
Power consumption A 1, 7   Permanently
Coil resistance Ω 2.3    
Inductance mH 1.6   For 1 kHz
Duty cycle % 0...100    
Boost pressure control pressure transducer (Y31/5)         
Power consumption A < 1.2    
Voltage drop V < 1.0   For a maximum current strength
Resistor Ω 14 ± 0.75 at 20°C
PWM frequency Hz 140 ± 3  
Duty cycle (adjustment range) % 5...95    
Pressure regulating valve (Y74)         
Power consumption A 0...2    
Inductance mH 5.3   For 1 kHz and 20°C
PWM frequency Hz 400    
Coil resistance Ω 2   at 20°C
Regulated pressure bar 190...2000    
Flow l/h 120    
Fuel injectors (Y76)         
Supply voltage V <250    
Flow through fuel injector (max.) A Unknown    
Internal resistance Unknown    
Capacity μF Unknown    
Injection period μs 50...7500    
Injection pressure (max.) bar 1800    
Radiator shutters actuator (Y84) (except code 550 (Trailer hitch))         
Model       Switchover valve
Supply voltage V 12   Terminal 87
Load stress V      
Coil resistance Ω      
Inductance mH      
Exhaust gas recirculation cooler bypass switchover valve (Y85)         
Power consumption A < 0.5    
Voltage drop V 1.0   For a maximum current strength
Switchover valve resistance Ω 28 ± 0.75 at 20°C
Switchover valve frequency Hz 12    
Duty cycle % 0...100    
Boost pressure control flap pressure transducer (Y93)         
Power consumption A < 1.2    
Voltage drop V < 1.0   For a maximum current strength
Resistor Ω 14 ± 0.75 at 20°C
PWM frequency Hz 140 ± 3  
Duty cycle (adjustment range) % 5...95    
Quantity control valve (Y94)         
Rated voltage V 12    
Load stress V 10.5...16    
Coil resistance Ω 5, 3   at 20°C
Actuation signal frequency, pulse width modulated signal Hz Unknown    
Duty cycle % 0...100    
Operating temperature °C -40...120    
Media temperature °C -40...140    
Left switchable engine mount (Y123) Right switchable engine mount (Y123/1)         
Load stress V 9...15    
Induction voltage V < 130    
Minimum pulling voltage V < 9.0    
Minimum failure voltage V >1.0    
Operating temperature °C -40...120    
Bearing limit temperature °C -40...130    
Coil resistance Ω 31.0 ± 10% at 20°C
Total resistance Ω 27.2 ± 10% at 20°C
Power consumption A < 0.5   For 12 V
Switching speed Hz 2...30    
Engine oil pump valve (Y130)         
Rated voltage V 12    
Load stress V 9 to 16    
Power consumption A max. 1.8    
Oil spray nozzle shutoff valve (Y131)         
Rated voltage V 12    
Load stress V 8 to 16    
Power consumption A < 2    
Voltage drop V < 2   For 2.5 bar
Resistor Ω 11   at 20°C
Duty cycle, pulse width modulated signal % 0...100    
Coolant pump switchover valve (Y133)         
Power consumption A < 0.5    
Voltage drop V < 1.0   For a maximum current strength
Resistor Ω 28 ± 0.75 at 20°C
Duty cycle, pulse width modulated signal % 0...100    
  Wiring diagram of common rail diesel injection control unit (CDI) N3/9, engine side, sheet 1 PE07.16-P-2101-97NBE
N3/9, engine-side, sheet 2 PE07.16-P-2101-97NBF
N3/9, body-side PE07.16-P-2101-97NBD