Drivetrain control unit, component description - GF54.21-P-2141OLD
Model 205 (except 205.012/212), 253 with engine 651.9
Shown on model 205.0
Location
The powertrain control unit is installed in the front passenger footwell.
Tasks
The powertrain control unit is responsible for 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.
Regulation of engine cooling
The fan motor (M4/7), the radiator shutters actuator motor (M87) or the radiator trim flap actuator motor (M2/37) (with CODE 5U3 (AIRPANEL)) and low-temperature circuit circulation pump 1 (M43/6) are controlled by the powertrain control unit via the drivetrain LIN (LIN C3).
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)
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
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 (fused) | - | - |
| - | Terminal 31 | - |
| Circuit 87C | - | - |
| Low temperature circuit temperature sensor (B10/13) | - | - |
| Exhaust flap controller (M16/57) | Exhaust flap controller (M16/57) | - |
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 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) | - |
| Radiator trim flap actuator (M2/37) | Radiator trim flap actuator (M2/37) | With CODE 5U3 (AIRPANEL) |
| Input factors over engine CAN (CAN C) | Output factors via engine CAN (CAN C) | Supplemental information |
|---|---|---|
| CDI control unit (N3/9) | CDI control unit (N3/9) | - |
| Input factors via drive train CAN (CAN C1) | Output factors via drive train CAN (CAN C1) | Supplemental information |
|---|---|---|
| CDI control unit (N3/9) | CDI control unit (N3/9) | - |
| 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 CODE 427 (7G-TRONIC) or with CODE 421 (9G-TRONIC) |
| 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) | With CODE 483 (ADVANCED AGILITY package) and CODE 489 (AIRmatic) (Model 205) |
| AIR BODY CONTROL unit (N51/3) | AIR BODY 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 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 consists of a plastic housing with three plug connections and internal measuring and control electronics.
Ground connection
The ground connection is made via the right front footwell ground point (W15/7).
Assembly operations
Ensure before disconnecting the plug on the powertrain control unit that the ignition is switched off and processor run-on has ended. This is to prevent damage to the powertrain control unit and the storing of errors from the control units in the CAN network.
| Wiring diagram for powertrain control unit | N127 | PE54.21-P-2141-97FBA |