Drivetrain Control Unit, Component Description - GF54.21-P-2141MRH
Engine 274.9 in model 205.047/053/054/147/247/253, 253.354/954
Shown on model 205.0
Location
The powertrain control unit is secured in the vehicle interior to the inner partition wall to the engine compartment.
Tasks
The powertrain control unit acts as an interface between the ME-SFI [ME] control unit and the CAN network, and it fulfills the following tasks:
- Regulation of engine cooling
- Reading in of signals
- Evaluation of input factors
- Output of signals and actuation of components
Apart from this, the powertrain control unit acts as an interface (Gateway) between the connected CAN bus systems. The energy management module is integrated into the powertrain control unit and it coordinates the energy flows from the hybrid drive system and - based on the electrical variables - it forms the interface to the control units for the battery management system (N82/2), power electronics (N129/1) and the electric A/C compressor (A9/5).
Regulation of engine cooling
The powertrain control unit controls the fan motor (M4/7), the radiator trim flap actuator motor (M2/37) with (CODE 5U3 (AIRPANEL)), the electric coolant pump (M75/11) with (CODE 494 USA version)), the low-temperature circuit switchover valve (Y73/1) and low-temperature circuit circulation pump 1 (M43/6) over the drive train LIN (LIN C3).
Reading in of signals
Input factors are read in by means of the following connections:
- Direct line
- Drivetrain LIN
- Engine CAN (CAN C)
- Drive train CAN (CAN C1)
- Chassis FlexRay (Flex E)
- Periphery CAN (CAN PER)
- Hybrid CAN (CAN L)
Evaluation of input factors
The input factors that have been read in are evaluated by the integrated microprocessor and the affected components are then actuated.
Output of signals and actuation of components
Initial parameter are output over the following connections:
- Direct line
- Drivetrain LIN
- Engine CAN
- Drive train CAN
- Chassis FlexRay
- Peripherals CAN
- Hybrid CAN
The electronic ignition lock control unit (N73) is the central interface (Gateway) for exchanging the function-relevant data of the control units that are connected to the various CAN bus systems.
Input factors and output factors for the following components are read in or output over direct lines by the powertrain control unit:
| Input factors over a direct line | Initial parameters over a direct line | Supplemental information |
|---|---|---|
| Terminal 15 | - | - |
| Circuit 30 | - | - |
| Circuit 30 (fused) | - | - |
| Circuit 31 | - | - |
| Low temperature circuit temperature sensor (B10/13) | - | - |
| Low-temperature circuit 2 temperature sensor (B10/24) | - | - |
| Evaporator temperature sensor (B10/6) | - | - |
| - | High-voltage battery cooling system expansion valve (Y110) | - |
| - | High-voltage battery cooling system switchover valve (Y140) | - |
| - | Heater booster relay (K16/3) | Cold countries |
Input factors and output factors for the following components and control units are sent or received by the powertrain control unit over LIN or CAN:
| Input factors over engine CAN (CAN C) | Output factors via engine CAN (CAN C) | Supplemental information |
|---|---|---|
| ME-SFI control unit (N3/10) | ME-SFI control unit (N3/10) | - |
| Input factors via drive train CAN (CAN C1) | Output factors via drive train CAN (CAN C1) | Supplemental information |
|---|---|---|
| ME-SFI control unit (N3/10) | ME-SFI control unit (N3/10) | - |
| Fuel system control unit (N118) | Fuel system control unit (N118) | - |
| Fully integrated transmission control unit (Y3/8n4) | Fully integrated transmission control unit (Y3/8n4) | - |
| Accelerator pedal module control unit (B37n1) | Accelerator pedal module control unit (B37n1) | - |
| Input factors over drive-train-LIN (LIN C3) | Output factors over drive-train-LIN (LIN C3) | Supplemental information |
|---|---|---|
| Radiator trim flap actuator (M2/37) | Radiator trim flap actuator (M2/37) | With CODE 5U3 (AIRPANEL) |
| Fan motor (M4/7) | Fan motor (M4/7) | - |
| Low-temperature circuit circulation pump 1 (M43/6) | Low-temperature circuit circulation pump 1 (M43/6) | - |
| Electric coolant pump (M75/11) | Electric coolant pump (M75/11) | With CODE 494 (USA version) |
| Low-temperature circuit switchover valve (Y73/1) | Low-temperature circuit switchover valve (Y73/1) | - |
| Input factors via hybrid CAN (CAN L) | Starting data via hybrid CAN (CAN L) | Supplemental information |
|---|---|---|
| Battery management system control unit (N82/2) | Battery management system control unit (N82/2) | |
| Power electronics control unit (N129/1) | Power electronics control unit (N129/1) |
| Input factors via periphery CAN (CAN PER) | Output factors via periphery CAN (CAN PER) | Supplemental information |
|---|---|---|
| Electronic ignition lock control unit (N73) | Electronic ignition lock control unit (N73) | - |
| Input factors over chassis FlexRay (Flex E) | Output factors over chassis FlexRay (Flex E) | Supplemental information |
|---|---|---|
| Electronic Stability Program control unit (N30/4) | Electronic Stability Program control unit (N30/4) | - |
| AIRmatic control unit (N51/3) for model 205 | AIRmatic control unit (N51/3) for model 205 | With CODE 483 (ADVANCED AGILITY package) and CODE 489 (AIRmatic) (Model 205) |
| AIR BODY CONTROL control unit (N51/3) for model 253 | AIR BODY CONTROL control unit (N51/3) for model 253 | With CODE 489 (AIR BODY CONTROL) (Model 253) |
| Radar sensors control unit (N62/1) | Radar sensors control unit (N62/1) | With CODE 23P (Driving Assistance Package) |
| Electronic ignition lock control unit (N73) | Electronic ignition lock control unit (N73) | - |
| Steering column tube module control unit (N80) | Steering column tube module control unit (N80) | - |
Structure
The powertrain control unit housing is made of plastic. The dust-proof powertrain control unit is installed in the vehicle interior.
Ground connection
"Circuit 31" is connected to ground over the footwell ground point at the front right (W15/7).
Voltage supply
The powertrain control unit is powered directly by "Circuit 30", through a "Fused circuit 30" and with ignition ON by "Circuit 87". In the operating voltage range it has both short-circuit protection and reversed polarity protection. Power is supplied through several parallel-connected pins in order to relieve the electrical connections.
Variants
The control unit variants, e.g. national, exhaust and function variants, are activated by XENTRY Diagnostics using the variant coding function.
| Wiring diagram for powertrain control unit | N127 | PE54.21-P-2141-97FBA |