Common rail diesel injection (CDI), function - GF07.16-P-0001OMD
ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) with CODE 494 (US version) Bosch
Common rail diesel injection (CDI) - general
The C ommon Rail D iesel I njection (CDI) constitutes the engine timing "CR43" in the electrical connection with the sensors and actuators of engine 651.
The short designation "CR" stands for:
CR = Common Rail
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 timing system is located in the CDI control unit (N3/9). Sensor data is directly read in from the engine timing and indirectly via the CAN interconnection and actuates the respective actuators. The individual functions and systems of the engine timing system are controlled and coordinated by the CDI control unit.
The following table provides an overview of the vehicle model and major assembly overviews:
| Sales designation | Type | Motor | Transmission | Engine management | Notes |
|---|---|---|---|---|---|
| Model series 212 | |||||
| E 250 BLUETEC | 212.004 | 651.924 | 722.908 | CR43 | |
| 4ME 250 BlueTEC MATIC | 212.097 | 651.924 | 722.965 | CR43 |
The engine timing is subdivided into the following systems:
- Basic functions
- Engine system
- Injection system
- Air control system
- Exhaust system
Basic functions
- Control unit diagnosis
- Fault memory
- on-board diagnosis II (OBD II)
- Diagnosis over CAN
- CAN network
- Flash programming
- Variant coding
- Drive authorization system 4 (DAS 4)
- Torque coordination
- Thermal management
- Alternator interface
- Synchronization
- Load detection
Diagnosis
For diagnostic purposes, the fault codes from the engine timing can be read off and deleted with Xentry Diagnostics, and specific diagnostic functions initiated.
CAN network
The CDI control unit exchanges data via the connected drive train CAN (CAN C) and chassis CAN 1 (CAN E1) with the other control units integrated in the CAN network.
The CDI control unit also acts as the interface (gateway) between the CAN bus systems. The CDI control unit is also connected to the drivetrain LIN (LIN C1) and the drive train sensor CAN (CAN I) via which it exchanges data.
Flash programming
The engine timing in the CDI control unit is flashable, that is the complete software in the control unit can be exchanged (replaced) using Xentry Diagnostics. The software required for control unit programming can be found on the Star Diagnosis software DVD.
Variant coding
Using variant coding the following vehicle versions and equipment can be coded using Xentry Diagnostics:
- Vehicle model
- National version
- Exhaust variant
- Transmission version
Engine system
- Starter relay actuation
- Throttle valve control
- Safety fuel shutoff
- Transmission overload protection
- Electronic Stability Program (ESP) support
- Electronic transmission control assist (EGS)
- Fully integrated transmission control assist (VS)
- Starting torque limiting
- Anti-jerk control
- Suction fan actuation
- Alternator regulation
- Glow time control
- Control of the engine timing, start/stop function (with code (B03) ECO start/stop function)
Injection system
- Pre, main and post injection
- Idle speed control
- Smooth running control
- Limp-home function
- Speed increase for air conditioning
- Deceleration fuel shutoff
- Rail pressure regulation
- Fuel pump control
- High-pressure pump control
- Altitude adaptation
- RPM limitation
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 control
- Exhaust aftertreatment, DPF regeneration (D iesel P articulate F ilter) with code (474) Particulate filter)
- Exhaust aftertreatment, injection of AdBlue® reduction agent (with code (U77) BLUETEC (SCR) diesel exhaust treatment)
Exhaust emissions standard
Vehicles with code (U77) BlueTEC (SCR) diesel exhaust treatment fulfill the USA BIN5 exhaust emissions standards.
Engine 651 is characterized by the following components:
- 2 Lanchester balance shafts
- Gear drive in combination with a drive chain on the flywheel side for driving the high-pressure pump, oil pump, Lanchester balance shafts and the two camshafts
- The oil pump integrated in the crankcase
- Oil spray nozzle shutoff valve (Y131) for controlling the oil spray nozzles for piston crown cooling
- Uneatable coolant pump
- Exhaust gas recirculation (EGR) with coolant-cooled precooler and EGR cooler with switchable bypass duct
- Cylinder head with 2-piece water jacket
- Rapid glowing system with glow output stage (N14/3)
- Load-level controlled preinjection and post injection
The following variants are offered:
- The engine 651.924 has fuel injectors (Y76) with piezo technology, two turbocharger switched in series with vacuum-controlled boost pressure flap, a wastegate, a charge air bypass flap and an additional low-pressure turbocharger boost pressure sensor (B5/4)
The operating conditions of the engine and the concurrently active engine timing subfunctions 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 (with code (B03) ECO start/stop function)
- Forced induction, function
- Exhaust treatment, function
- Exhaust gas recirculation, function
- Preheat, function
| Ignition ON, function | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) as of model year 2014 with CODE 494 (US version) Bosch | GF07.10-P-1000OMA | |
| Starting, function | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) as of model year 2014 with CODE 494 (US version) Bosch | GF07.10-P-1001OMA | |
| Ignition OFF, function | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) as of model year 2014 with CODE 494 (US version) Bosch | GF07.10-P-1002OMA | |
| Fuel supply, function | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) as of model year 2014 with CODE 494 (US version) Bosch | GF07.10-P-1003OMA | |
| Injection regulation, function | GF07.10-P-1004OM | ||
| Rpm control, function | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) as of model year 2014 with CODE 494 (US version) Bosch | GF07.10-P-1008OMA | |
| Alternator interface function | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) as of model year 2014 with CODE 494 (US version) Bosch | GF07.10-P-1009OMA | |
| Smooth running control, function | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) as of model year 2014 with CODE 494 (US version) Bosch | GF07.10-P-1011OMA | |
| Thermal management, function | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) as of model year 2014 with CODE 494 (US version) Bosch | GF07.10-P-1012OMA | |
| Torque coordination, function | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) as of model year 2014 with CODE 494 (US version) Bosch | GF07.10-P-1013OMA | |
| Deceleration fuel shutoff, function | GF07.10-P-1014OM | ||
| Engine limp-home mode, function | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) as of model year 2014 with CODE 494 (US version) Bosch | GF07.10-P-1019OMA | |
| On-board diagnosis, function | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) as of model year 2014 with CODE 494 (US version) Bosch | GF07.10-P-1020OMA | |
| Engine timing start-stop function | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) as of model year 2014 with CODE 494 (US version) Bosch | GF07.10-P-1041OMA | |
| Common Rail Diesel Injection (CDI), block diagram | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) as of model year 2014 with CODE 494 (US version) Bosch | GF07.16-P-0001-08OMA | |
| Common rail diesel injection (CDI), location of components on engine | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) with CODE 494 (US version) Bosch | GF07.16-P-0001-14OM | |
| Common rail diesel injection (CDI), location of components on vehicle | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) as of model year 2014 with CODE 494 (US version) Bosch | GF07.16-P-0001-15OMA | |
| Charging, function | ENGINE 651.9 (except 651.925) in MODEL 212.0 (except 212.098), 212.2 (except 212.298) with CODE 494 (US version) | GF09.00-P-2000OMA | |
| Exhaust treatment function | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) as of model year 2014 with CODE 494 (US version) Bosch | GF14.00-P-3000OMA | |
| Exhaust gas recirculation, function | GF14.20-P-3000OM | ||
| Preheat, function | ENGINE 651.9 as of 9/1/13 in MODEL 212 (except 212.098/298) as of model year 2014 with CODE 494 (US version) Bosch | GF15.20-P-3005OMA | |
| Overview of system components for common rail diesel injection (CDI) | GF07.16-P-9997OM |