Drivetrain Control Unit, Component Description - GF54.21-P-2141MRA
Engine 274.9 in model 205 (except 205.047/053/054/147/247/253), 253 (except 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:
- Reading in of signals
- 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.
Reading in of signals
Input factors are read in by means of the following connections:
- Direct line
- Engine CAN (CAN C)
- Drive train CAN (CAN C1)
- Drive-train LIN (LIN C3)
- Suspension FlexRay (Flex E)
Output of signals and actuation of components
Initial parameter are output over the following connections:
- Direct line
- Engine CAN
- Drive train CAN
- Drivetrain LIN
- Chassis FlexRay
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) | - | M274.9 with 155 kW or 175 kW |
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 [ME] control unit (N3/10) | ME-SFI [ME] control unit (N3/10) | - |
| Input factors via drive train CAN (CAN C1) | Output factors via drive train CAN (CAN C1) | Supplemental information |
|---|---|---|
| ME-SFI [ME] control unit (N3/10) | ME-SFI [ME] 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) | with automatic transmission |
| Input factors over drive-train-LIN (LIN C3) | Output factors over drive-train-LIN (LIN C3) | Supplemental information |
|---|---|---|
| Fan motor (M4/7) | Fan motor (M4/7) | - |
| Low-temperature circuit circulation pump 1 (M43/6) | Low-temperature circuit circulation pump 1 (M43/6) | - |
| Radiator shutters actuator motor (M87) | Radiator shutters actuator motor (M87) | With CODE 2U1 (Radiator shutters) |
| Radiator trim flap actuator (M2/37) | Radiator trim flap actuator (M2/37) | With CODE 5U3 (AIRPANEL) |
| Input factors over suspension FlexRay (Flex E) | Output factors over suspension FlexRay (Flex E) | Supplemental information |
|---|---|---|
| Electronic Stability Program control unit (N30/4) | Electronic Stability Program control unit (N30/4) | - |
| AIRmatic control unit (N51/3) | AIRmatic control unit (N51/3) | With CODE 483 (ADVANCED AGILITY package) and CODE 489 (AIRmatic) (Model 205) |
| AIR BODY CONTROL control unit (N51/3) | AIR BODY CONTROL control unit (N51/3) | 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 |