Drivetrain control unit, component description - GF54.21-P-2141GN
ENGINE 276.8 in MODEL 166.063 as of model year 2016
View of model 166.063 from front left
Location
The powertrain control unit is located on the passenger side under the seat.
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
- Drive train CAN (CAN C)
- Engine CAN (CAN C1)
- Chassis CAN 1 (CAN E1)
- Hybrid CAN (CAN L)
- Drive-train-LIN (LIN C3)
Output of signals and actuation of components
Initial parameter are output over the following connections:
- Direct line
- Drive train CAN
- Engine CAN
- Chassis CAN 1
- Hybrid CAN
- Drive train LIN
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 | - | Rear fuse box (F4) |
| Terminal 30 | - | Rear fuse box (F4) |
| Circuit 30 (fused) | - | Rear fuse box (F4) |
| Circuit 31 | - | Right footwell ground point (W15/1) |
| Circuit 87 C | Circuit 87 C | Turbocharger relay (F58kO) |
| - | Fan motor (M4/7) | Over a pulse width modulated signal |
| 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 via drive train CAN (CAN C) | Input factors via drive train CAN (CAN C) | 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 engine CAN (CAN C1) | Initial parameters over engine CAN (CAN C1) | Supplemental information |
|---|---|---|
| ME-SFI control unit (N3/10) | ME-SFI control unit (N3/10) | - |
| Input factors via chassis CAN 1 (CAN E1) | Input factors via chassis CAN 1 (CAN E1) | Supplemental information |
|---|---|---|
| Instrument cluster (A1) | Instrument cluster (A1) | Over electronic ignition lock control unit (N73) and interior CAN (CAN B) |
| Supplemental restraint system control unit (N2/10) | Supplemental restraint system control unit (N2/10) | - |
| SAM control unit (N10) | SAM control unit (N10) | Over electronic ignition lock control unit (N73) and interior CAN (CAN B) |
| Automatic climate control and operating unit (N22/7) | Automatic climate control and operating unit (N22/7) | Over electronic ignition lock control unit (N73) and interior CAN (CAN B) |
| Electronic Stability Program control unit (N30/4) | Electronic Stability Program control unit (N30/4) | - |
| Radar sensors control unit (N62/1) (for code 23P (Driving assistance package PLUS)) | Radar sensors control unit (N62/1) (for code 23P (Driving assistance package PLUS)) | Over chassis gateway control unit (N93/7) and chassis FlexRay (Flex E) |
| Electronic ignition lock control unit (N73) | Electronic ignition lock control unit (N73) | - |
| Chassis gateway control unit (N93/7) | Chassis gateway control unit (N93/7) | - |
| Diagnostic connector (X11/4) | Diagnostic connector (X11/4) | Over electronic ignition lock control unit (N73) and diagnostic CAN (CAN D) |
| Starting data 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 over drive-train-LIN (LIN C3) | Output factors over drive-train-LIN (LIN C3) | Supplemental information |
|---|---|---|
| Low-temperature circuit circulation pump 1 (M43/6) | Low-temperature circuit circulation pump 1 (M43/6) | - |
| Low-temperature circuit switchover valve (Y73/1) | Low-temperature circuit switchover valve (Y73/1) | - |
Body
The powertrain control unit housing is made of plastic.
Ground connection
"Circuit 31" is connected to ground over a ground line to the left front footwell ground point (W15/5).
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.
Computer power-down
Information for partial function "no-load current shutoff" is documented in the function description "Engine OFF energy management function".
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-2141-97NBA |