P07.16-3876-79
Block diagram of direct signals |
B1 | Engine oil temperature sensor | B19/9 | Temperature sensor upstream of diesel particulate filter | S43 | Oil level check switch | ||
B2/6 | Left hot film MAF sensor | B19/11 | Temperature sensor upstream of turbocharger | Y27/9 | Exhaust gas recirculation actuator | ||
B2/6b1 | Left intake air temperature sensor | B28/5 | Pressure sensor downstream of air filter | Y74 | Pressure regulator valve | ||
B2/7 | Right hot film MAF sensor | B28/8 | Differential pressure sensor (DPF) | Y76/1 | Cylinder 1 fuel injector | ||
B2/7b1 | Right intake air temperature sensor | B37 | Accelerator pedal sensor | Y76/2 | Cylinder 2 fuel injector | ||
B4/6 | High pressure fuel pressure sensor | B50 | Fuel temperature sensor | Y76/3 | Cylinder 3 fuel injector | ||
B4/34 | Cylinder 1 combustion chamber pressure sensor | B60 | Exhaust pressure sensor | Y76/4 | Cylinder 4 fuel injector | ||
B4/35 | Cylinder 2 combustion chamber pressure sensor | B70 | Crankshaft Hall sensor | Y76/5 | Cylinder 5 fuel injector | ||
B4/36 | Cylinder 3 combustion chamber pressure sensor | G1 | On-board electrical system battery | Y76/6 | Cylinder 6 fuel injector | ||
B4/37 | Cylinder 4 combustion chamber pressure sensor | G3/2 | Oxygen sensor upstream of catalytic converter | Y77/1 | Boost pressure positioner | ||
B4/38 | Cylinder 5 combustion chamber pressure sensor | K40/8kG | Engine compartment terminal 15 relay | Y85 | Exhaust gas recirculation cooler bypass switchover valve | ||
B4/39 | Cylinder 6 combustion chamber pressure sensor | K40/8kH | Starter circuit 50 relay | Y94 | Quantity control valve | ||
B5/1 | Boost pressure sensor | K40/8kN | Circuit 87Mrelay | Y123 | Left switchable engine mount | ||
B6/1 | Camshaft Hall sensor | M1 | Starter | Y123/1 | Right switchable engine mount | ||
B11/4 | Coolant temperature sensor | M16/6 | Throttle valve actuator | Y130 | Engine oil pump valve | ||
B16/15 | Temperature sensor upstream of SCR catalytic converter (with code U77 ( BlueTEC (SCR) diesel exhaust treatment))) | M55 | Intake port shutoff actuator motor | Y133 | Coolant pump switchover valve | ||
B17/8 | Charge air temperature sensor | N3/9 | CDI control unit | ||||
B19/7 | Temperature sensor upstream of catalytic converter | R39/1 | Vent line heater element |
P07.16-3875-79
Block diagram for CAN-networking |
A1 | Instrument cluster | L6/3 | Left rear axle rpm sensor | N80 | Steering column module control unit | ||
A8/1 | Transmitter key | L6/4 | Right rear axle rpm sensor | N118 | Fuel pump control unit | ||
A40/3 | COMAND control unit | M3 | Fuel pump (FP) | N118/5 | AdBlue® control unit (with code U77 (BlueTEC (SCR) diesel exhaust treatment)) | ||
A40/9 | Audio/COMAND control panel | M4/7 | Fan motor | N127 | Drivetrain control unit | ||
A103/1b1 | AdBlue® container temperature sensor (with code U77 (BlueTEC (SCR) diesel exhaust treatment))) | M43/6 | Low temperature circuit circulation pump 1 | R7/1 | AdBlue® pressure line heating element (with code U77 (BLUETEC (SCR) diesel exhaust treatment))) | ||
A103/1b5 | AdBlue® fill level sensor (with code U77 (BlueTEC (SCR) diesel exhaust treatment))) | M87 | Radiator shutters actuator motor | R9 | Glow plugs | ||
A103/1r1 | AdBlue® container heating element (with code U77 (BlueTEC (SCR) diesel exhaust treatment))) | N2/10 | Supplemental restraint system control unit | S9/1 | Stop lamp switch | ||
A103/2 | AdBlue® delivery module (with code U77 (BLUETEC (SCR) diesel exhaust treatment))) | N3/9 | CDI control unit | X11/4 | Diagnostic connector | ||
A103/2m1 | AdBlue® delivery pump (with code U77 (BlueTEC (SCR) diesel exhaust treatment))) | N10/6 | Front SAM control unit | Y3/8n4 | Fully integrated transmission control unit (with code 427 (7G-TRONIC)) or (with code 421 (9G-TRONIC)) | ||
A103/2m2 | AdBlue® extraction pump (with code U77 (BlueTEC (SCR) diesel exhaust treatment))) | N14/3 | Glow output stage | Y129 | AdBlue® metering valve (with code U77 (BlueTEC (SCR) diesel exhaust treatment))) | ||
B4/1 | Fuel tank fuel level indicator fill level sensor, left | N22/1 | Climate control control unit | CAN A | Telematics CAN | ||
B4/2 | Fuel tank fuel level indicator fill level sensor, right | N30/4 | Electronic Stability Program control unit | CAN B | Interior CAN | ||
B4/7 | Fuel pressure sensor | N37/7 | NOx sensor control unit downstream of diesel particulate filter (with code U77 (BlueTEC (SCR) diesel exhaust treatment)) | CAN C | Engine CAN | ||
B37 | Accelerator pedal sensor | N37/7b1 | NOx sensor downstream of diesel particulate filter (with code U77 (BlueTEC (SCR) diesel exhaust treatment))) | CAN C1 | Drive train CAN | ||
B64/1 | Brake vacuum sensor | N37/8 | NOx sensor control unit downstream of SCR catalytic converter (with CODE U77 (BlueTEC (SCR) diesel exhaust treatment)) | CAN D | Diagnostic CAN | ||
B76/1 | Condensation sensor for fuel filter with heating element | N37/8b1 | NOx sensor downstream of the SCR catalytic converter (with code U77 (BlueTEC (SCR) diesel exhaust treatment))) | CAN HMI | User interface CAN | ||
G2 | Alternator | N51/3 | AIRMATIC control unit | CAN I | Drive train sensor CAN | ||
K40/5kV | AdBlue® relay (with code U77 (BLUETEC (SCR) diesel exhaust treatment)) | N62/1 | Radar sensors control unit (with CODE P20 (Driving assistance package)) | Flex E | Chassis FlexRay | ||
L6/1 | Left front axle rpm sensor | N69/1 | Left front door control unit | LIN C1 | Drive train LIN | ||
L6/2 | Right front axle rpm sensor | N73 | Electronic ignition switch control unit | LIN C3 | Drivetrain LIN |
Common rail diesel injection system, general points
The common rail diesel injection system operates in an electrical network of sensors and actuators for engine 642.8 to form the engine management system "CR61".
The short designation "CR61" stands for:
CR = Common Rail
61 = CDI 61 as an ongoing generation designation for diesel direct injection technology
The "common rail" is the line shared by all injectors for fuel delivery. The fuel upstream of the injection is stored in this common line.
The entire engine management is located in the CDI control unit. Sensor data are directly read in from the engine management and indirectly via the CAN network and actuate the control actuators as required. The individual functions and systems of the engine management are controlled and coordinated by the CDI control unit.
The following table provides a model and major assembly overview:
Sales designation | Model | Motor | Transmission | Engine management | Notes |
Model series 222 | |||||
S 350 (sedan) | 222.032 | 642.861 | 722.903, 725.011 | CR-61 | |
S 350 (sedan) 4MATIC Limousine | 222.033 | 642.861 | 722.966 | CR-61 | |
S 350 CDI Limousine (long wheelbase) | 222.123 | 642.861 | 722.903, 725.011 | CR-61 | |
S 350 BlueTEC Limousine (long wheelbase) | 222.132 | 642.861 | 722.903, 725.011 | CR-61 | |
S 350 BlueTEC 4MATIC Limousine (long wheelbase) | 222.133 | 642.861 | 722.966 | CR-61 |
The engine management is subdivided into the following systems:
Basic functions
Engine system
Fuel injection system
Air control system
Exhaust system
Basic functions
Control unit diagnosis
Fault memory
European On-Board Diagnosis (EOBD)
Diagnosis via the Control Area Network (CAN)
CAN network
Flash programming and variant coding
DAS stage 4 (FBS 4)
Torque coordination
Heat management
Alternator interface
Synchronization
Load determination
Diagnosis
For diagnostic purposes, the fault codes of the engine management system can be read out and deleted using Xentry Diagnostics, and individual diagnostic functions can be specifically actuated.
Transport mode
In transport mode various functions of the engine management are limited. More information is available in the function "Energy management". If the kilometer reading of the vehicle is more than 250 km, the system condition "vehicle transport mode" is automatically deactivated and can also not be reactivated anymore using the diagnostic system.
Variant coding
With variant coding the following vehicle versions and equipment can, for example, be coded using XENTRY Diagnostics:
Vehicle model
National version
Exhaust variant
Transmission version
Flash programming
The engine management in the CDI control unit is flashable, i.e. the entire software of the control unit can be exchanged (replaced) using Xentry Diagnostics. The software required for control unit programming can be found in the diagnostic system.
CAN network
The CDI control unit exchanges data via the attached drivetrain CAN and the engine CAN with the powertrain control unit.
Furthermore the powertrain control unit serves as an interface (Gateway) between the CAN bus systems and the CDI control unit.
Engine system
Starter relay actuation
Throttle valve control
Safety fuel shutoff
Transmission overload protection
Electronic Stability Program control unit support
Fully integrated transmission control support
Drive off torque limitation and anti-jerk control
Fan operation
Alternator regulation and glow time control
Engine management Start-Stop function
Fuel injection system
Pre, main and post injection
Idle speed control and rpm limitation
Smooth running control
Limp-home function
A/C rpm increase
Inertia fuel shutoff
Fuel pressure control in the rails
Fuel pump controlling
High-pressure pump control
Altitude adaptation
Air control system
Exhaust gas recirculation (EGR)
Charge pressure control
Intake air throttling through intake port shutoff (EKAS)
Exhaust system
Catalytic converter heating
Oxygen sensor heater controlling
Exhaust aftertreatment, DPF regeneration (Diesel particulate filter)
Exhaust aftertreatment, injection of the reduction agent AdBlue®
Engine 642.8 complies with EU -6 exhaust emissions standard and is characterized by the following components:
V6 crankcase made out of aluminum instead of cast iron
Balance shaft located in the "V" of both cylinder banks, which rotates in the opposite direction to the crankshaft
Valve assembly with roller cam followers
Rapid glowing system with glow output stage
A flow-dynamics optimized forced induction system consisting of a ATL with variable turbine geometry
Exhaust gas recirculation with water-cooled exhaust gas recirculation cooler
Highly efficient ventilation system with centrifugal oil separator
Fuel injectors (Y76) with piezo technology
Intake controlled high-pressure pump with lower operating energy input on average, leading to reduced fuel consumption
Switchable coolant pump
Water-cooled charge air cooler
The operating conditions of the engine and the associated active partial functions of the engine management are described in the following documents:
Ignition ON, function | |||
Starting, function | |||
Ignition OFF, function | |||
Fuel supply, function | |||
Injection regulation, function | |||
Rpm control, function | |||
Alternator interface function | |||
Smooth running control, function | |||
Thermal management, function | |||
Torque coordination, function | |||
Deceleration fuel shutoff, function | |||
Engine limp-home mode, function | |||
On-board diagnosis, function | |||
Engine timing start-stop function | The "Engine management, start/stop function" subfunction is examined from the point of view of the engine management. Information for partial function "Energy management, start/stop function" is documented in the function description "Energy management function". | ||
Charging, function | |||
Exhaust treatment function | |||
Exhaust gas recirculation, function | |||
Preheat, function | |||
Overview of system components for common rail diesel injection (CDI) |
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