Drivetrain control unit, component description - GF54.21-P-2141RF
Engine 276.8 in model 205, 253
Shown on model 205.0
Location
The powertrain control unit is fastened to the partition wall to the engine compartment in the front passenger footwell.
Task
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
- Drive-train-LIN (LIN C3)
- Engine CAN (CAN C)
- Drive train CAN (CAN C1)
- Chassis FlexRay (Flex E)
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
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.
The following input factors and output factors 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) | - | - |
| Terminal 31 | - | - |
| Low temperature circuit temperature sensor (B10/13) | - | - |
The following input and output factors 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) | - |
| 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 P23 (EXCLUSIVE exterior), except CODE 239 (DISTRONIC PLUS), except CODE 23P (Driving assistance package plus) |
| Fan motor (M4/7) | Fan motor (M4/7) | - |
| Low-temperature circuit circulation pump 1 (M43/6) | Low-temperature circuit circulation pump 1 (M43/6) | - |
| 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) | AIRmatic control unit (N51/3) | In model 205 with CODE 483 (ADVANCED AGILITY package) and CODE 489 (AIRmatic) |
| AIR BODY CONTROL unit (N51/3) | AIR BODY CONTROL unit (N51/3) | In model 253 with CODE 489 (AIR BODY CONTROL) |
| Radar sensors control unit (N62/1) | Radar sensors control unit (N62/1) | With code 23P (Driving Assistance package Plus) |
| 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) | - |
Body
The powertrain control unit housing is made of plastic. The powertrain control unit is installed protected against dust in the front passenger footwell.
Ground connection
The "circuit 31" ground connection occurs by a ground line to the left front footwell ground point (W15/5) (with left-hand drive vehicles) or to the right front footwell ground point (W15/7) (with right-hand drive vehicles).
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 control 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 |