(Component Description For CDI Control Unit - GF07.16-P-6000OIA)
Engine 656.9 in model 213, 238, 257
up to model year 2021
Engine 656.9 in model 222
View of the engine from above
Location
The CDI control unit is on the air filter housing.
Tasks
The CDI control unit performs the following tasks:
- Controlling the engine basic functions
- Reading in of signals
- Evaluation of input factors
- Output of signals and actuation of component parts
In the electrical network with the sensors and actuators, the CDI control unit forms the engine management system. The CDI control unit also acts as the interface (gateway) between the three connected CAN bus systems.
Controlling the engine basic functions
- Fuel supply
- Glow system
- Injection quantity control
- Diagnosis and fault storage
- Drive authorization system
- Exhaust gas recirculation
- Exhaust treatment
- Torque coordination
- ECO start/stop function release
Reading in of signals
The input factors are read in via the following connections:
- Direct line
- Drive-LIN (LIN C1)
- Engine CAN (CAN C)
- Drive train CAN (CAN C1)
- Drive train sensor CAN (CAN I)
Evaluation of input factors
The input factors that have been read in are evaluated by the integrated microprocessor and the relevant components are then actuated.
Output of signals and actuation of component parts
Initial parameter are output over the following connections:
- Direct line
- Drive train LIN
- Engine CAN
- Drive train CAN
- Drive train sensor CAN
| Input factors over a direct line | Initial parameters over a direct line | Supplemental information |
|---|---|---|
| Terminal 15 | - | - |
| Circuit 30 (fused) | - | - |
| Circuit 31 | - | - |
| Terminal 87 | - | - |
| Engine oil temperature sensor (B1) | - | - |
| Hot film mass air flow sensor (B2/5) | - | - |
| Intake air temperature sensor (B2/5b1) | - | - |
| High pressure fuel pressure sensor (B4/6) | - | - |
| Fuel pressure sensor (B4/7) | - | - |
| Boost pressure sensor (B5/1) | - | - |
| Low-pressure turbocharger boost pressure sensor (B5/4) | - | - |
| Camshaft Hall sensor (B6/1) | - | - |
| Coolant temperature sensor (B11/4) | - | - |
| Charge air temperature sensor (B17/8) | - | - |
| Temperature sensor upstream of charge air cooler (B17/11) | - | Model 213, 238 |
| Temperature sensor upstream of catalytic converter (B19/7) | - | |
| Temperature sensor upstream of diesel particulate filter (B19/9) | - | - |
| Temperature sensor upstream of exhaust gas turbocharger (B19/11) | - | - |
| DPF differential pressure sensor (B28/8) | - | - |
| DPF differential pressure sensor for OBD (B28/16) | - | Model 222 |
| Low pressure EGR differential pressure sensor (B28/18) | - | - |
| Engine oil fill level sensor (B40/6) | - | - |
| Fuel temperature sensor (B50) | - | - |
| Exhaust pressure sensor (B60) | - | - |
| Crankshaft Hall sensor (B70) | - | - |
| Exhaust gas recirculation cooling bypass flap Hall sensor (B90) | - | Model 222 |
| Low pressure exhaust gas recirculation temperature sensor (B157/2) | - | - |
| - | Starter circuit 50 relay (K40/8kH) | - |
| Circuit 87M relay (K40/8kN) | Circuit 87M relay (K40/8kN) | - |
| Engine compartment circuit 15 relay (K40/8kG) | - | - |
| Throttle valve actuator (M16/6) | Throttle valve actuator (M16/6) | - |
| - | Intake port shutoff actuator motor (M55) | - |
| Supplemental Restraint System control unit (N2/10) | - | Direct crash signal |
| - | Fuel system control unit (N118) | - |
| - | Vent line heater element (R39/1) | - |
| - | Coolant thermostat heating element (R48) | - |
| CAMTRONIC actuator, exhaust cylinders 1 and 2 (Y49/22) | CAMTRONIC actuator, exhaust cylinders 1 and 2 (Y49/22) | - |
| Cylinder 3 and 4 exhaust CAMTRONIC actuator (Y49/23) | Cylinder 3 and 4 exhaust CAMTRONIC actuator (Y49/23) | - |
| Cylinder 5 and 6 exhaust CAMTRONIC actuator (Y49/24) | Cylinder 5 and 6 exhaust CAMTRONIC actuator (Y49/24) | - |
| - | 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) | - |
| - | Cylinder 5 fuel injector (Y76/5) | - |
| - | Cylinder 6 fuel injector (Y76/6) | - |
| - | Wastegate pressure transducer (Y77) | - |
| Exhaust gas turbocharger guide vane actuator (Y77/1) | Exhaust gas turbocharger guide vane actuator (Y77/1) | - |
| - | Exhaust gas recirculation cooler bypass switchover valve (Y85) | - |
| - | Low-pressure exhaust gas recirculation actuator (Y87/5) | - |
| - | High-pressure exhaust gas recirculation actuator (Y87/6) | - |
| - | Quantity control valve (Y94) | - |
| - | Boost pressure control pressure transducer (Y100/2) | - |
| - | Engine oil pump valve (Y130) | - |
| - | Oil spray nozzle shutoff valve (Y131) | - |
| - | Coolant pump switchover valve (Y133) | - |
Input and initial parameters for the following assembly parts 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 drive train CAN (CAN C1) | Initial parameters via drive train CAN (CAN C1) | Supplemental information |
|---|---|---|
| Fuel system control unit (N118) | Fuel system control unit (N118) | - |
| Fully integrated transmission control (Y3/8n4) electric controller unit control unit | Fully integrated transmission control (Y3/8n4) electric controller unit control unit | - |
| Powertrain control unit (N127) | Powertrain control unit (N127) | - |
| Input factors over engine CAN (CAN C) | Initial parameters via engine CAN (CAN C) | Supplemental information |
|---|---|---|
| Instrument cluster (A1) | Instrument cluster (A1) | Via user interface-CAN (CAN HMI), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
| Head unit (A26/17) | - | Via user interface-CAN (CAN HMI), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
| Audio/COMAND control panel (A40/9) | - | Via telematics CAN (CAN A), head unit (A26/17), user interface CAN (CAN HMI), electronic ignition lock control unit (N73), chassis FlexRay (Flex E) and powertrain control unit (N127) |
| Supplemental Restraint System control unit (N2/10) | - | Via user interface-CAN (CAN HMI), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
| Front SAM control unit (N10/6) | - | Over the interior CAN (CAN B), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
| Climate control, control unit (N22/1) | - | Over the interior CAN (CAN B), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
| Electronic Stability Program control unit (N30/4) | - | Via suspension FlexRay (Flex E) and powertrain control unit (N127) |
| AIRMATIC control unit (N51/3) | - | Via suspension FlexRay (Flex E) and powertrain control unit (N127) |
| Mercedes-Benz Intelligent Drive control unit (N62/4) (with code 23P (Driving assistance package)) | - | Via suspension FlexRay (Flex E) and powertrain control unit (N127) |
| Left front door control unit (N69/1) | - | Over the interior CAN (CAN B), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
| Electronic ignition lock control unit (N73) | Electronic ignition lock control unit (N73) | Via suspension FlexRay (Flex E) and powertrain control unit (N127) |
| Steering column tube module control unit (N80) | - | Via suspension FlexRay (Flex E) and powertrain control unit (N127) |
| Powertrain control unit (N127) | Powertrain control unit (N127) | - |
| Diagnostics connection (X11/4) | Diagnostics connection (X11/4) | Via diagnostic CAN (CAN D), electronic ignition lock control unit (N73), suspension FlexRay (Flex E) and powertrain control unit (N127) |
| Input factors via drive train sensor CAN (CAN I) | Initial parameters via drive train sensor CAN (CAN I) | Supplemental information |
|---|---|---|
| NOx sensor control unit upstream of diesel oxidation catalytic converter (N37/12) | NOx sensor control unit upstream of diesel oxidation catalytic converter (N37/12) | - |
| NOx sensor control unit downstream of SCR catalytic converter (N37/8) | NOx sensor control unit downstream of SCR catalytic converter (N37/8) | - |
| AdBlue® control unit (N118/5) | AdBlue® control unit (N118/5) | - |
Structure
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.
The CDI control unit has an internal atmospheric pressure sensor.
Variants
The engine management variants, e.g. country and exhaust variants, are activated with the diagnostic tester via variant coding.
Assembly operations: Before detaching the plugs from the CDI control unit, the ignition must be switched off and processor power-down must be stopped. This is to prevent damage to the CDI control unit and save errors in the control units linked to the CAN.
| Wiring diagram of common rail diesel injection system control unit (CDI) | Engine 656.9 in model 213 up to model year 2021 (Plugs1, 2) | PE07.16-P-2101-97DBF | |
| Engine 656.9 in model 213 up to model year 2021 (Plugs 3, 4, 5) | PE07.16-P-2101-97DBG | ||
| Engine 656.9 in model 213 up to model year 2021 (Plug 6) | PE07.16-P-2101-97DBH | ||
| Engine 656.9 in model 222 (Plugs 1, 2) | PE07.16-P-2101-97SEF | ||
| Engine 656.9 in model 222 (Plugs 3, 4, 5) | PE07.16-P-2101-97SEG | ||
| Engine 656.9 in model 222 (Plug 6) | PE07.16-P-2101-97SEH | ||
| Engine 656.9 in model 238 up to model year 2021 (Plugs 1, 2) | PE07.16-P-2101-97DCF | ||
| Engine 656.9 in model 238 up to model year 2021 (Plugs 3, 4, 5) | PE07.16-P-2101-97DCG | ||
| Engine 656.9 in model 238 up to model year 2021 (Plug 6) | PE07.16-P-2101-97DCH | ||
| Engine 656.9 in model 257 up to model year 2021 (Plug 6) | PE07.16-P-2101-97XBD | ||
| Engine 656.9 in model 257 up to model year 2021 (Plugs 1, 4, 5) | PE07.16-P-2101-97XBE | ||
| Engine 656.9 in model 257 up to model year 2021 (Plugs 2, 3) | PE07.16-P-2101-97XBF |