(Common Rail Diesel Injection (CDI), Function - GF07.16-P-0001OGR)
Engine 642.8 in MODEL 166
up to model year 2016
Direct networking block diagram
Block diagram for CAN-networking
Common rail diesel injection (CDI), function
The "CR-60" Engine management system consists of the C ommon Rail D iesel Injection (CDI) and its electrical connections to the sensors and actuators of Engine 642.8.
The abbreviated designation "CR-60+" means:
CR = Common Rail
1 0 = CDI 60 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. Therefore a common rail system is also called "storage injection". The entire Engine management system is located in the CDI control unit (N3/9). Sensor data are read in directly by the Engine management and indirectly via the CAN network and the respective actuators are actuated. 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 166.0 | |||||
| ML 350 CDI 4MATIC Blue EFFICIENCY | 166.023 | 642.826 | 722.903 | CR-60 | |
| ML 350 BlueTEC 4MATI | C166.024 | 642.826 | 722.903 | CR-60 | |
| Model series 166.8 | |||||
| ML 350 CDI 4MATIC Blue EFFICIENCY | 166.823 | 642.826 | 722.903 | CR-60 | |
| GL 350 BlueTEC 4MATIC | 166.824 | 642.824, 642.826 | 722.903 | CR-60 |
The Engine management is subdivided into the following systems:
- Base functions
- Engine system
- Diesel injection system
- Air control system
- Exhaust system
Base functions
- Control unit diagnosis
- Fault memory
- OBD II (OBD II)
- Diagnosis via the CAN network
- Flash programming and variant coding
- Drive authorization system stage 3 (DAS 3)
- Torque coordination
- Thermal 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. Further information are available in the energy management function. If the kilometer reading on the vehicle is more than 250 km, the system condition "vehicle transport mode" is automatically deactivated and can then no longer be reactivated by the diagnostic tester.
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 on the Star Diagnosis Update DID.
CAN network
The CDI control unit exchanges data via the connected drive train CAN (CAN C), chassis CAN 1 (CAN E1) and drive train sensor CAN (CAN I) (with code U42 (BLUETEC (SCR) diesel exhaust treatment) with other control units integrated in the CAN network. The CDI control unit also acts as the interface (gateway) between the three CAN bus systems. The CDI control unit is also connected to the drive train LIN (LIN C1) and exchanges data over it.
Engine system
- Start relay actuation
- Throttle valve control
- Safety fuel shutoff
- Transmission overload protection
- Support for ESP®
- Fully integrated transmission control support
- Drive off torque limitation and anti-jerk control
- Fan control
- Alternator regulation and glow time control
- Start/stop function Engine management (with code B03 (ECO start/stop function))
Diesel injection system
- Pre, main and post injection
- Idle speed control and rpm limitation
- Smooth running control
- Limp-home function
- A/C rpm increase
- Deceleration fuel shutoff
- Fuel pressure control
- Fuel pump controlling
- Fuel high-pressure pump controller
- Altitude adaptation
Air control system
- Exhaust gas recirculation (EGR)
- Boost pressure control
- Intake air throttling through intake port shutoff (EKAS)
Exhaust system
- Catalytic converter heating
- Oxygen sensor heater controlling
- Exhaust aftertreatment, DPF regeneration (D iesel p articulate f ilter)
- Exhaust aftertreatment, injection of AdBlue® reduction agent (with code U42 (BlueTEC (SCR) diesel exhaust treatment))
Exhaust emissions standard
Engine 642.8 complies with the EU-5 exhaust emissions standard. Vehicles with code U42 (BLUETEC (SCR) diesel exhaust treatment) fulfill the EU-6 exhaust emissions standard or the BIN5 LEVII exhaust emissions standard for the USA.
Engine 642.8 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 (N14/3)
- 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
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 | Engine 642.8 in MODEL 166 up to model year 2016 |
GF07.10-P-1000OGR | |
| Starting, function | Engine 642.8 in MODEL 166 up to model year 2016 |
GF07.10-P-1001OGR | |
| Ignition OFF, function | Engine 642.8 in MODEL 166 up to model year 2016 |
GF07.10-P-1002OGR | |
| Fuel supply, function | Engine 642.8 in MODEL 166 up to model year 2016 |
GF07.10-P-1003OGR | |
| Injection regulation, function | Engine 642.8 in MODEL 166 up to model year 2016 |
GF07.10-P-1004OGR | |
| Rpm control, function | Engine 642.8 in MODEL 166 up to model year 2016 |
GF07.10-P-1008OGR | |
| Alternator interface function | Engine 642.8 in MODEL 166 up to model year 2016 |
GF07.10-P-1009OGR | |
| Smooth running control, function | Engine 642.8 in MODEL 166 up to model year 2016 |
GF07.10-P-1011OGR | |
| Thermal management, function | Engine 642.8 in MODEL 166 up to model year 2016 |
GF07.10-P-1012OGR | |
| Torque coordination, function | Engine 642.8 in MODEL 166 up to model year 2016 |
GF07.10-P-1013OGR | |
| Deceleration fuel shutoff, function | Engine 642.8 in MODEL 166 up to model year 2016 |
GF07.10-P-1014OGR | |
| Engine limp-home mode, function | Engine 642.8 in MODEL 166 up to model year 2016 |
GF07.10-P-1019OGR | |
| On-board diagnosis, function | Engine 642.8 in MODEL 166 up to model year 2016 |
GF07.10-P-1020OGR | |
| Engine timing start-stop function | Engine 642.8 in MODEL 166 up to model year 2016 with CODE B03 (ECO start/stop function) |
GF07.10-P-1041OGR | |
| Charging, function | Engine 642.8 in MODEL 166 up to model year 2016 |
GF09.00-P-2000OGR | |
| Exhaust treatment function | Engine 642.8 in MODEL 166 up to model year 2016 |
GF14.00-P-3000OGR | |
| Exhaust gas recirculation, function | Engine 642.8 in MODEL 166 up to model year 2016 |
GF14.20-P-3000OGR | |
| Preheat, function | Engine 642.8 in MODEL 166 up to model year 2016 |
GF15.20-P-3005OGR | |
| Overview of system components for common rail diesel injection (CDI) | Engine 642.8 in MODEL 166 up to model year 2016 |
GF07.16-P-9997OGR |