Drivetrain Control Unit, Component Description - GF54.21-P-2141LF
Engine 157.9, 276.8, 277, 278.9, 279 in model 217, 222 (except 222.163/173)
Engine 176.9, 177.9 in model 217, 222
Engine 177.9 in model 290 up to model year 2021
Engine 256.9 in model 213, 238, 257, 290 up to model year 2021
Engine 256.9, 264.9 in model 222
Illustration shows model 213
Location
The powertrain control unit is located in the front passenger footwell and it is fastened to the engine compartment's partition wall.
Tasks
The powertrain control unit acts as an interface between the ME-SFI control unit (N3/10) and the CAN network and it is responsible for the following tasks:
- Reading in of signals
- Evaluation of input factors
- Output of signals and activation of components
The electronic ignition lock control unit (N73) is the central gateway for exchanging the function-relevant data of the control units that are connected to the various CAN bus systems.
Reading in of signals
The input factors are read in via the following connections:
- Direct line
- Engine CAN (CAN C)
- Drive train CAN (CAN C1)
- Hybrid CAN (CAN L) (with code B01 (48V technology))
- Periphery CAN (CAN PER)
- Suspension FlexRay (Flex E)
- Drive-train-LIN (LIN C3)
- Exhaust LIN (LIN C4)
Evaluation of input factors
The input factors that have been read in are evaluated by the integrated microprocessor whereupon the corresponding components are actuated and signals are output.
Output of signals and activation of components
The initial parameters are output via the following connections:
- Direct line
- Engine CAN
- Drive train CAN
- Hybrid CAN (with code B01 (48V technology))
- Peripherals CAN
- Chassis FlexRay
- Drivetrain LIN
- Exhaust LIN
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 from | Output factors over a direct line to | Supplemental information |
|---|---|---|
| Coolant expansion reservoir fill level sensor (B4/40) | - | Engine 256.9 |
| Low temperature circuit temperature sensor (B10/13) | - | Except engine 177.9 |
| Low-temperature circuit temperature sensor 2 (B10/14) | - | With code B01 (48V technology) |
| Accelerator pedal sensor (B37) | - | - |
| Fan motor (M4/7) | - | Model 222 with engine 277 and 279 AMG up to 01.09.2014 |
| - | Exhaust flap switchover valve (Y93) | Engine 276.8 as of model year 2018 |
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) from | Initial parameters over engine CAN (CAN C) to | Supplemental information |
|---|---|---|
| ME-SFI [ME] control unit (N3/10) | ME-SFI [ME] control unit (N3/10) | - |
| Input factors over drive CAN (CAN C1) from | Initial parameters over drive CAN (CAN C1) to | 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) | - |
| Control unit for electric controller unit of fully integrated transmission control (Y3/8n4) | Control unit for electric controller unit of fully integrated transmission control (Y3/8n4) | - |
| Input factors via hybrid CAN (CAN L) (with code B01 (48V technology)) from | Output factors via hybrid CAN (CAN L) (with code B01 (48 V technology)) to | Supplemental information |
|---|---|---|
| Starter alternator (M1/10) | Starter alternator (M1/10) | Engine 264 |
| Starter-alternator control unit (N129) | Starter-alternator control unit (N129) | Engine 256 |
| Input factors via peripherals CAN (CAN PER) from | Output factors via peripherals CAN (CAN PER) to | Supplemental information |
|---|---|---|
| Electronic ignition lock control unit (N73) | Electronic ignition lock control unit (N73) | - |
| Input factors via suspension FlexRay (Flex E) from | Output factors via suspension FlexRay (Flex E) to | 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) | Model 217, 222 |
| AIR BODY CONTROL, control unit (N51/3) | AIR BODY CONTROL, control unit (N51/3) | Model 213, 238, 257, 290 with code 489 (AIR BODY CONTROL) |
| Mercedes-Benz Intelligent Drive control unit (N62/4) | Mercedes-Benz Intelligent Drive control unit (N62/4) | 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) | - |
| Input factors over drive train-LIN (LIN C3) from | Output factors over drive train-LIN (LIN C3) to | Supplemental information |
|---|---|---|
| Actuator motor (M2/37) | Actuator motor (M2/37) | Model 222 with code 2U1 (Radiator shutters) |
| Upper radiator trim flap actuator motor (M2/38) | Upper radiator trim flap actuator motor (M2/38) | Model 213, 238, 257 with code 2U1 (Radiator shutters) |
| Lower radiator trim flap actuator motor (M2/39) | Lower radiator trim flap actuator motor (M2/39) | Model 213, 238, 257 with code 2U1 (Radiator shutters) |
| Fan motor (M4/7) | Fan motor (M4/7) | Engine 157.9, 176.9, 256.9, 276.8, 278.9 Model 222 with engine 277 and 279 AMG as of 01.09.2014 |
| Low-temperature circuit circulation pump 1 (M43/6) | Low-temperature circuit circulation pump 1 (M43/6) | - |
| Low temperature circuit circulation pump 2 (M43/7) | Low temperature circuit circulation pump 2 (M43/7) | With code B01 (48V technology) or engine 177.9 |
| Low-temperature circuit circulation pump 3 (M43/8) | Low-temperature circuit circulation pump 3 (M43/8) | Engine 177.9 |
| Low-temperature circuit switchover valve (Y73/1) | Low-temperature circuit switchover valve (Y73/1) | Model 213, 222, 238, 257, 290 with engine 256.9 Model 217, 222, 290 with engine 177.9 Model 217, 222 with engine 176.9, 276.8, 279 Model 222 with engine 277 |
| Input factors via exhaust LIN (LIN C4) from | Output factors via exhaust LIN (LIN C4) to | Supplemental information |
|---|---|---|
| Left exhaust flap actuator motor (M16/53) | Left exhaust flap actuator motor (M16/53) | Model 217, 222 with engine 176.9, 177.9 Model 222 with engine 256.9, 264.9 Model 238, 257, 290 with code U78 (AMG Sport exhaust system) Model 257 with code U21 (AMG Performance exhaust system) |
| Right exhaust flap actuator motor (M16/54) | Right exhaust flap actuator motor (M16/54) | Model 217, 222 with engine 176.9, 177.9 Model 222 with engine 256.9 Model 238, 257, 290 with code U78 (AMG Sport exhaust system) |
| Exhaust flap center actuator motor (M16/55) | Exhaust flap center actuator motor (M16/55) | Engine 177.9 |
Variants
The control unit variants, e.g. country, exhaust and function variants, are activated with the diagnostics tester using variant coding.
| Wiring diagram for powertrain control unit | Engine 256.9 in model 213 up to model year 2021 | PE54.21-P-2141-97DBA | |
| Model 217, 222 up to model year 2018 | PE54.21-P-2141-97SEA | ||
| Model 217, 222 as of model year 2018 | PE54.21-P-2141-97SEB | ||
| Engine 256.9 in model 238 up to model year 2021 | PE54.21-P-2141-97DCA | ||
| Engine 256.9 in model 257, 290 up to model year 2021 | PE54.21-P-2141-97XBA |