Automatic Transmission - Service Techniques: Overview BMW X3 E83 рестайлинг

Brief description of components

The automatic transmission consists of the following components

1. Mechatronics module The automatic transmission is controlled by the mechatronics module. The mechatronics module is a combination of hydraulic unit and electronics module. The hydraulic control unit is the hydraulic part of the transmission control system. The electronics module contains the EGS control unit, the sensors and the electrical connections within the transmission. (EGS is the abbreviation for electronic transmission control)
2. Selector lever, selector lever position display > E53, E81, E83, E85, E86, E87, E90, E91, E92, E93 > E60, E61 until 03/2007 > E63, E64 until 09/2007 The selector lever has the following positions: P for Park R for Reverse N for Neutral D for Drive (= automatic mode) M/S M for manual mode = Steptronic, S for sport program = automatic mode with sporty map The selector lever position display is located in the selector lever trim. > E65, E66 The selector lever is located on the steering column. The selector lever has the following positions: p for Park R for Reverse N for Neutral D for Drive (= automatic mode) The selector lever position display is located in the instrument cluster.
3. GWS: Gear selector switch > E60, E61 from 03/2007 > E63 from 09/2007 > E70 The gear selector switch is configured as a control unit in its own right. With the gear selector switch, the transmission is no longer actuated mechanically, but rather electronically.
4. SPORT button for Dynamic Driving Control > E60, E61, E63, E64 with sport automatic transmission Dynamic Driving Control (FDC) is activated with the SPORT button: Gearshift times are shortened and the shift characteristics are made more sporty. The engine responds more spontaneously to movements of the accelerator pedal. The steering and holding forces of the steering tuned for a sportier feel - for Servotronic or active front steering (AFS). AFS includes Servotronic. > E70 On the E70 with the option "Adaptive Drive", only the damping characteristics are changed (normal or sport).
5. Steering wheel with buttons for sport program and manual mode > E65, E66 The steering wheel has a button for selecting the program. The following drive programs can be selected in a predefined sequence: Sport program, manual mode or automatic mode. The steering wheel also houses the buttons for changing up and down in manual mode. Program selection and control in manual mode are described in the Owner's Handbook.
6. Gearshift paddles Vehicles with gearshift paddles: In addition to the sequential gear selection with the selector lever, the gears can also be selected using the 2 gearshift paddles on the steering wheel. The shift pulse is transmitted electrically to the EGS control unit. With this gearshift method ("shift-by-wire") there is no mechanical linkage between the gearshift paddles and the transmission. Pull one of the gearshift paddles briefly to change up a gear. Press one of the gearshift paddles briefly to change down a gear.
7. Instrument cluster display The drive ranges and drive program are displayed in the instrument cluster, the signal required for this is sent from the electronic transmission control.
8. CID: Central Information Display > E60, E61, E63, E64, E70, E81, E85, E86, E87, E90, E91, E92, E93 The CID displays detailed information about the Check-Control messages in the instrument cluster. The instrument cluster controls these messages on the K-CAN (body CAN). In addition to the visual display, the Check Control also alerts the driver with acoustic signals. Depending on the importance of the associated message, a single or double gong with varying volume and tone will sound. The instrument cluster controls these warnings by means of the K-CAN. Acoustic warnings are emitted by the M-ASK (multi-audio system controller) or CCC (Car Communication Computer).
9. CD: Control display > E65, E66 The control display is the central display for the information and communication system. The control display is used as an interface between the MOST and K-CAN data buses. (MOST = "Media Oriented System Transport"; K-CAN = body controller area network".) Amongst other things, detailed information about the Check-Control messages in the instrument cluster are displayed on the control display. The instrument cluster controls these messages on the K-CAN (body CAN).

The electronic transmission control requires signals from the following components (in alphabetical order)

1. Brake light switch The signal from the brake light switch is needed for the function of the selector lever lock and the adaptive transmission control.
2. DME or DDE: Digital engine electronics or digital diesel electronics The DME or DDE sends messages about the current operating status of the engine to the EGS (e.g. engine speed or torque). The EGS reports the current operating status of the transmission back to the DME or DDE.
3. DSC: Dynamic Stability Control The DSC optimizes both driving stability when pulling away or accelerating and traction. Within the limitations of the laws of physics, DSC compensates for driving conditions such as over/understeering. As part of this process, dynamic driving signals (e.g. wheel rotation speed, lateral acceleration) are sent to the DSC control unit. DSC transmits the processed signals regarding cornering, acceleration and winter detection to the EGS control unit.
4. Accelerator pedal module The signal from the accelerator pedal module is needed for the adaptive transmission control.
5. JBE: Junction box electronics > E70, E81, E87, E90, E91, E92, E93 The JBE is the data interface (= gateway) between the K-CAN and the PT-CAN. Signals from the F-CAN are simply looped through. (K-CAN = body CAN; PT-CAN = powertrain CAN; F-CAN = chassis CAN.) The junction box consists of the JBE and the power distributor. The power distributor provides power, amongst other things, for the gate pattern diagram and the EGS control unit.
6. KGM: Body gateway module > E60, E61, E63, E64 from 09/2005 From 09/2005, the vehicle electrical system has been modified. The body gateway module (KGM) supersedes the SGM. The KGM is the data interface (= gateway) between the K-CAN and the PT-CAN. (K-CAN = body CAN; PT-CAN = powertrain CAN.) The diagnosis wire is connected to the KGM.
7. SGM: Safety and gateway module > E60, E61, E63, E64 up to 09/2005 > E65, E66 The SGM is the data interface (= gateway) between the K-CAN, byteflight and the PT-CAN. (K-CAN = body CAN; PT-CAN = powertrain CAN.) The diagnosis wire is connected to the SGM.

Operation

The different automatic transmission drive positions are selected with the selector lever.

When driving, there are the following possibilities

1. D = Automatic mode When the selector lever is in position "D", gears are selected by the adaptive transmission control. Gearshift using gearshift paddles If the selector lever is in position "D" and a gearshift is initiated using the gearshift paddles, the automatic transmission will automatically change to manual mode. If no gearshift is made and the vehicle does not accelerate significantly within 6 seconds, the automatic transmission will change back to automatic mode.
2. SD = Automatic mode, sport program When the selector lever is moved to the right from position "D" into the shift gate "M/S", the automatic transmission's sport-shift program is activated. The display in the instrument cluster changes from "D" to "SD". M1 to M6 = Steptronic If the selector lever is in shift gate "M/S" and is briefly moved to "-" or "+", the electronic circuitry changes to Steptronic. Permanent manual mode is activated with the selector lever or gearshift paddles. The display in the instrument cluster changes from "SD" to "M1" to"M6". In manual mode (Steptronic), upshifts and downshifts are only executed by the transmission control if road speed and engine speed are suitable. Gearshifts that would result in an excessively high or low engine speed are suppressed.
3. Sport program via SPORT button When the SPORT button is pressed, the electronics will change to the sport program regardless of the drive range engaged or the current selector lever position.