Component description for intelligent servo module for DIRECT SELECT - GF27.19-P-4020AIA
TRANSMISSION 722.930 in MODEL 205
Automatic transmission viewed from left
Location
The intelligent servo module for DIRECT SELECT is mounted on the left of the transmission housing.
Task
General
The driver's gear range request "P", "R", "N", "D" is not transmitted from the control to the transmission via a rod (mechanical connection) but by means of an electronic connection ("wire"). This electronic connection consists of the DIRECT SELECT lever (S16/13) and the intelligent servo module for DIRECT SELECT. The overall system is called "Shift-by-wire".
Basic functions
The intelligent servo module for DIRECT SELECT receives the signals from the angle sensor which records the actual position of the range selector lever and eccentric shaft. The intelligent servo module for DIRECT SELECT controls the main motor and the emergency motor.
Flash programming
The intelligent servo module for DIRECT SELECT is flashable, i.e., the control unit's complete software can be exchanged (replaced) with Xentry Diagnostics. The software required for control unit programming is located on the STAR DIAGNOSIS software DVD.
CAN bus
The intelligent servo module for DIRECT SELECT is connected to the CAN network of the vehicle via the drive train CAN (CAN C1) and exchanges data with other control units.
Input and output signals
The intelligent servo module for DIRECT SELECT evaluates the following input signals and outputs the appropriate output signals:
Evaluation of input factors
The read-in input factors are evaluated by the fully integrated transmission control unit.
Actuation of components
The actuation of the components takes place via the following connections:
Direct line
- Terminal 30
- Circuit 31
- Power supply for emergency motor as emergency path
Drive train CAN
Signals from
- Fully integrated transmission control unit (Y3/8n4)
- ME-SFI control unit (N3/10)
- Powertrain control unit (N127)
Evaluation of input factors
The read-in input factors are evaluated by the fully integrated transmission control unit.
Actuation of components
The actuation of the components takes place via the following connections:
- Direct line
- Drive train CAN
Direct line
- None
Drive train CAN
Signal to
- Fully integrated transmission control unit
- ME-SFI [ME] control unit
- Drive train control unit
The powertrain control unit and the electronic ignition lock control unit (N73) are interfaces (Gateways) for the exchange of function-relevant data for control units that are connected to the various Controller Area Network (CAN) bus systems.
Shown in range selector lever position "N"
Function
The main motor is actuated and the threaded rod is turned by the drive belt and the two drive pulleys. The carriage moves to the required position and the range selector lever assumes the specified position selected. The actual position is detected by the angle sensor and sent via the drive train CAN to the fully integrated transmission control unit. With "circuit 15 ON", the intelligent servo module for DIRECT SELECT sends the signal for the currently engaged gear range to the ME-SFI [ME] control unit, to the fully integrated transmission control unit and to the powertrain control unit via the drive train CAN. With "circuit 15 OFF" and vehicle standstill, selector lever position "P" or "N" is engaged, as soon as the transmitter key (A8/1) is removed from the electronic ignition lock control unit.
TRANSMISSION 722.930 in MODEL 205 with CODE 889 (KEYLESS-GO)
On vehicles with CODE (889) Keyless-Go, the request for selector lever position "P", with "circuit 15 OFF" and the vehicle at a standstill is made as soon as the driver door is opened. If selector lever position "N" is engaged before "Circuit 15 OFF" and the driver door is opened after "Circuit 15 OFF", selector lever position "N" remains engaged.
| Wiring diagram for intelligent servo module (ISM) control unit | PE27.60-P-2101-97FBA |