Intelligent servo module for DIRECT SELECT, component description - GF27.19-P-4020AHQ
MODEL 218 with TRANSMISSION 722.9 (except 722.931)
Automatic transmission viewed from left
Location
The intelligent servo module for DIRECT SELECT is mounted on the left of the transmission housing in the direction of travel.
Task
The task of the intelligent servo module for DIRECT SELECT is subdivided into the following subtasks:
- General
- Input and output signals
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". The intelligent servo module for DIRECT SELECT controls the main motor and the emergency motor.
The intelligent servo module for DIRECT SELECT measures the position of the eccentric shaft via the eccentric shaft position sensor and the actual position of the range selector lever via the angle sensor.
Input and output signals
The intelligent servo module for DIRECT SELECT evaluates the following input signals and outputs the appropriate output signals:
- Direct input signals
- Direct output signals
- CAN input signals
- CAN output signals
Direct input signals
- Terminal 30
- Circuit 31
- Power supply for emergency motor as emergency path
Direct output signals
- None
CAN input signals
Electronic Stability Program control unit (N30/4) (except code (233) DISTRONIC PLUS and model 218.374/974) or Premium Electronic Stability Program control unit (N30/7) (with code (233) DISTRONIC PLUS or model 218.374/974)
- Wheel speeds
- Status of service brake
Electronic ignition lock control unit (N73)
- Request to engage selector lever position "P" or "N"
Front SAM control unit with fuse and relay module (N10/1)
- Feedback "Circuit 54 ON" (additional information for park pawl)
Fully integrated transmission control unit (Y3/8n4)
- Specified position of range selector lever
CAN output signals
Control unit for fully integrated transmission control (Y3/8n4)
- Actual position of range selector lever (with "Circuit 15 ON")
Instrument cluster (A1)
- Selector lever position
The CDI control unit (N3/9) or ME-SFI [ME] control unit (N3/10) is the interface between the drive train CAN (CAN-C) and the chassis CAN (CAN E).
Shown in range selector lever position "N"
Function
The main motor is actuated and the worm shaft is turned via 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.
At "circuit 15 ON" the intelligent servo module for DIRECT SELECT routes the selector lever position sent by the fully integrated transmission control unit over the drive train CAN and chassis CAN to indicate the gear (A1p12) in the instrument cluster. At "Circuit 15 OFF", the intelligent servo module for DIRECT SELECT sends the selector lever position sent by the steering column tube module control unit (N80), to the gear indicator.
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.
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.
| Technical data Designation |
Unit | Value | Tolerance range | Remarks | |
|---|---|---|---|---|---|
| Intelligent servo module for DIRECT SELECT (A80) | |||||
| Power supply | V | 13.5 | |||
| Voltage limit: | minimum | V | 9.0 | ||
| maximum | V | 16.0 | |||
| Power consumption: | Stand-by | mA | 200 | ||
| Operation | A | < 30 | |||
| Extended operation | A | 40 | Maximum 300 ms | ||
| Quiescent current | mA | 0.2 | |||
| Reverse polarity protection | No | ||||
| Operating temperature range | °C | -40 - 140 | |||
| Adjustment times between gear ranges | ms | 300 | "P and D" | ||
| ms | < 150 | "N and R" | |||
| ms | < 150 | "N and P" | |||
| ms | < 150 | "N and D" | |||
| Flash capability/coding capability | Yes/yes | ||||
| Wiring diagram for intelligent servo module (ISM) control unit | A80 | PE27.60-P-2101-97XAA |