Component description for CDI control unit

GF07.16-S-6000C

Component description for CDI control unit

27.5.15

Engine

607 in model 415

Location
The CDI control unit (N3/9) is located rear the battery box.

N3/9	CDI control unit

S07.16-4603-06

Task

The CDI control unit (N3/9) operates in an electrical network of sensors and actuators to form the engine management system.

According to the input signals the following, amongst other things, the following systems and functions are controlled and coordinated:

 Fuel supply

 Control of glow system

 Injection quantity control

 Diagnosis and fault storage

 Thermal management

 Exhaust gas recirculation

 Exhaust treatment

 ECO start/stop function (with CODE MJ7 (ECO start/stop function))

 The CDI control unit (N3/9) has an internal atmospheric pressure sensor.

Input and output signals

From the CDI control unit (N3/9) the following input signals are evaluated and the appropriate output signals are issued:

 Direct input and output signals

 Controller Area Network input signals (CAN input signal) via the interior CAN (CAN I)

Direct input signals

The CDI control unit (N3/9) reads in the signals from the following components:

 Hot film MAF sensor (B2/5)

 Intake air temperature sensor (B2/5b1)

 Fuel pressure sensor (B4/6)

 Pressure sensor upstream of SCR catalytic converter (B5/13) (with code MB6 (Low-pollutant vehicle Euro 6 Gr. 1))

 Camshaft Hall sensor (B6/1)

 Coolant temperature sensor (B11/4)

 Refrigerant pressure sensor (B12/2)

 Exhaust gas recirculation temperature sensor (B16/14)

 Pressure sensor and charge air temperature sensor (B17)

 Temperature sensor upstream of SCR catalytic converter (B19/7) (with code MB6 (Low-pollutant vehicle Euro 6 Gr. 1))

 Temperature sensor upstream of diesel particulate filter (B19/9)

 Temperature sensor upstream of ATL (B19/11)

 DPF differential pressure sensor (B28/8)

 Accelerator pedal sensor (B37)

 Fuel temperature sensor (B50), 55 kW and 66 kW engine up to 09/13

 Exhaust pressure sensor (B60), 81 kilowatt engine

 Crankshaft Hall sensor (B70)

 Oxygen sensor upstream of SCR catalytic converter (G3/1) (with code MB6 (Low-pollutant vehicle Euro 6 Gr. 1))

 Oxygen sensor upstream of catalytic converter (G3/2)

 CC switch (S4s6), as of 11/12

 Brake light switch (S9/1)

 Clutch pedal switch (S40/3)

 MJ7Clutch pedal switch (S40/6) with CODE () ECO start/stop function

Direct output signals

The CDI control unit (N3/9) directly actuates the following components:

 Fuel pump relay (K10/2k1 )

 Engine control unit relay (K10/3)

 Fuel pump with fill level sensor (M3/3)

 Throttle valve actuator (M16/6)

 Glow output stage (N14/3)

 Heater module for injectors (N33/2)

 Exhaust gas recirculation positioner (high-pressure circuit) (Y27/9)

 Exhaust flap controller (Y27/17)

 Fuel injectors (Y76)

 Boost pressure control pressure transducer (Y77/1)

 Quantity control valve (Y94)

 Engine oil coolant hear exchanger closed-loop control valve (Y99), 55 kW and 66 kW engine up to 04/13, or 81 kW engine up to 09/13

 Exhaust gas recirculation positioner (low-pressure circuit) (Y111/2)

Signals via the interior CAN (CAN I)

To do this the CDI control unit (N3/9) communicates via the interior CAN (CAN I) with the following control units:

 Instrument cluster (IC) control unit (A1)

 Supplemental restraint system control unit (N2/2)

 Signal acquisition and actuation module (SAM) control unit (N10)

 Climate control control and operating unit (N20)

 Electronic Stability Program control unit (ESP) (N30/4)

 Fuse and relay module (SRM) control unit (N50)

 N68(Electric power steering (ES))

 Steering column tube module control unit (N80)

Glow system control

The CDI actuates the glow output stage (N14/3) over the CDI control unit (N3/9) . This in turn actuates the glow plugs (R9):

 Cylinder 1 glow plug (R9/1)

 Cylinder 2 glow plug (R9/2)

 Cylinder 3 glow plug (R9/3)

 Cylinder 4 glow plug (R9/4)

A distinction is made between "preglowing", "start-up glowing" and "afterglowing".

Fuel supply

The CDI control unit (N3/9) actuates the fuel pump (M3/3) over the fuel pump relay (K10/2k1) which delivers the fuel over the fuel filter to the high-pressure pump. The quantity control valve (Y94) regulates the feed to the high-pressure pump according to the actuation by the CDI control unit (N3/9) . The fuel pressure is regulated in the high-pressure pump to about 4.0 bar.

The quantity control valve (Y94) regulates the feed of fuel to the high-pressure pump according to the actuation by the CDI control unit (N3/9) in order to keep the temperature of the fuel low. The fuel temperature is detected via the fuel temperature sensor (B50) and transmitted permanently to the CDI control unit (N3/9). Any fuel not required flows back into the fuel tank through the return line.

Injection quantity control

The high-pressure pump pushes the fuel with an increased pressure in the common rail which distributes the fuel to the fuel injectors (Y76). The "common rail" literally means "common line". The fuel upstream of the injection is stored in this common line. The CDI control unit (N3/9) actuates the fuel injectors (Y76) rotational speed and load-dependent:

 Cylinder 1 fuel injector (Y76/1)

 Cylinder 2 fuel injector (Y76/2)

 Cylinder 3 fuel injector (Y76/3)

 Cylinder 4 fuel injector (Y76/4)

A distinction is made between "preinjection", "main injection" and "post injection" in the corresponding driving situations. The system's maximum injection pressure is 1600 bar.

Body

The housing is made out of diecast aluminum and the cover is made out corrosion-protected sheet steel. The CDI control unit (N3/9) is water proof and dust proof.

Ground connection

"Circuit 31" ground connection is connected through multiple ground lines to the internal combustion engine ground point (W11/3).

Variants

The variants of the engine management, such as the country and exhaust variants, are activated over the variant coding; the CDI control unit (N3/9) dos not have to be replaced for this.

	Common rail diesel injection (CDI), function		GF07.16-S-0001C
	ESP/BAS control unit, location/task	N30/4	GF42.45-S-4501C
	SAM control unit, component description	N10	GF54.21-S-4157C
	Component description for steering column tube module control unit	N80	GF54.21-S-6051C
	Instrument cluster (IC), function	A1	GF54.30-S-0002C
	Climate control operating unit, component description	Engine 607 in model 415 with code H06 (Air-conditioning system) S98	GF83.40-S-2261C
	Supplemental restraint systems control unit, location/task/design	N2/2	GF91.60-S-4018C
	Wiring diagram for common rail diesel injection (CDI) control unit	Engine 607.951 in model 415 with code MB5 (Low-emission vehicle Euro 5 Gr. I) with code MO1 (Engine OM 607 DE 15 LA 55 kW (75 hp) 4000 rpm) except code MB6 (Low-emission vehicle, Euro 6 Gr. 1) Control unit N3/9, Part 1Engine 607.951 in model 415 with code MB5 (Low-emission vehicle Euro 5 Gr. I) with code MO2 (Engine OM 607 DE 15 LA 66 kW (90 hp) 4000 rpm) except code MB6 (Low-emission vehicle, Euro 6 Gr. 1)Control unit N3/9, Part 1	PE07.16-S-2101VSA
		Engine 607.951 in model 415 with code MB5 (Low-emission vehicle Euro 5 Gr. I) with code MO1 (Engine OM 607 DE 15 LA 55 kW (75 hp) 4000 rpm) except code MB6 (Low-emission vehicle, Euro 6 Gr. 1) Control unit N3/9, Part 2Engine 607.951 in model 415 with code MB5 (Low-emission vehicle Euro 5 Gr. I) with code MO2 (Engine OM 607 DE 15 LA 66 kW (90 hp) 4000 rpm) except code MB6 (Low-emission vehicle, Euro 6 Gr. 1)Control unit N3/9, Part 2	PE07.16-S-2101VSB
		Engine 607.951 in model 415 with code MB5 (Low-emission vehicle Euro 5 Gr. I) with code MO3 (Engine OM 607 DE 15 LA 81 kW (110 hp) 4000 rpm) except code MB6 (Low-emission vehicle, Euro 6 Gr. 1) except code MO1 (Engine OM 607 DE 15 LA 55 kW (75 hp) 4000 rpm) except code MO2 (Engine OM 607 DE 15 LA 66 kW (90 hp) 4000 rpm)	PE07.16-S-2101VSC
		Engine 607.951 in model 415 with code MB6 (Low-emission vehicle, Euro 6 Gr. 1) with code MO1 (Engine OM 607 DE 15 LA 55 kW (75 hp) 4000 rpm) Control unit N3/9, Part 1Engine 607.951 in model 415 with code MB6 (Low-emission vehicle, Euro 6 Gr. 1) with code MO2 (Engine OM 607 DE 15 LA 66 kW (90 hp) 4000 rpm)Control unit N3/9, Part 1	PE07.16-S-2101VSD
		Engine 607.951 in model 415 with code MB6 (Low-emission vehicle, Euro 6 Gr. 1) with code MO1 (Engine OM 607 DE 15 LA 55 kW (75 hp) 4000 rpm) Control unit N3/9, Part 2Engine 607.951 in model 415 with code MB6 (Low-emission vehicle, Euro 6 Gr. 1) with code MO2 (Engine OM 607 DE 15 LA 66 kW (90 hp) 4000 rpm)Control unit N3/9, Part 2	PE07.16-S-2101VSE
		Engine 607.951 in model 415 with code MB6 (Low-emission vehicle, Euro 6 Gr. 1) with code MO3 (Engine OM 607 DE 15 LA 81 kW (110 hp) 4000 rpm) except code MO1 (Engine OM 607 DE 15 LA 55 kW (75 hp) 4000 rpm) except code MO2 (Engine OM 607 DE 15 LA 66 kW (90 hp) 4000 rpm)Control unit N3/9, Part 1	PE07.16-S-2101VSF
		Engine 607.951 in model 415 with code MB6 (Low-emission vehicle, Euro 6 Gr. 1) with code MO3 (Engine OM 607 DE 15 LA 81 kW (110 hp) 4000 rpm) except code MO1 (Engine OM 607 DE 15 LA 55 kW (75 hp) 4000 rpm) except code MO2 (Engine OM 607 DE 15 LA 66 kW (90 hp) 4000 rpm)Control unit N3/9, Part 2	PE07.16-S-2101VSG