The GA6HPTU gearbox is a further development of the known automatic gearbox
GA6HP. The re-engineered automatic gearbox provides a distinct boost in dynamics
while at the same time improving fuel consumption and pollutant emission.
The E70 is equipped with an electric gearshift system similar to the system in the E65.
In this case, however, the automatic gearbox is not operated from a steering column stalk
but rather from a selector lever that is located in the standard position on the center
console.
The shift pattern is largely modeled on a conventional gearshift with mechanical link to
the automatic gearbox. The electronic transmission control (EGS) has been adapted to
the changes/modifications.
This reference manual only deals with the changes and modifications to the GA6HP
gearbo
x.
Changes
The automatic gearbox GA6HPTU for the E70 has been reengineered in terms of the
following points:
• Torque converter with turbine-torsion damper
• Clutch E
• Adapted electronic transmission control (EGS)
• Fas
ter
h
ydraulics through new pressure regulator
• Electric gearshift
5
E70 Transmissions
New Transmissions for E70
Technical Data
Gearbo
x Variant
6
E70 Transmissions
GA6HP19TU GA6HP26TU
Type of gearbox
Passenger vehicle automatic gearbox with 6 forward speeds
and 1 reverse gear in standard arrangement.
Transmission output in [kW]
225 300
Transmission output in [Nm]
400 650
Torque converter
W240R TTD W270RH-4GWK TTD
Maximum permissible continuous speed of
torque converter in rpm
7000 7000
Transmission Ratios
1st gear
4.171
2nd gear
2.340
3rd gear
1.521
4th gear
1.143
5th gear
0.867
6th gear
0.691
Reverse
3.403
Gearbox weight (kg) including oil
77.0 92.0
Control
Electro-hydraulic with
electronic transmission control
Towing range
500 km at up to 80 km/h 500 km at up to 80 km/h
Maximum uphill/downhill gradient while driving
50% 50%
Ma
ximum uphill gradient, starting off
(in forward or reverse)
32% 32%
Model Engine T
ransmitted torque
GA6HP19TU
X5 3.0i (E70) N52B30O1 400 Nm
GA6HP26TU
X5 4.8i (E70) N62B48O1 650 Nm
7
E70 Transmissions
NOTES
PAGE
8
E70 Transmissions
Electronic Transmission Control
The following diagram shows the interconnection of the electronic transmission control
with the gear selector lever and the interfaces in the vehicle.
9
E70 Transmissions
Index Explanation Index Explanation
1
EGS control module
7
Car Access System (CAS)
2
DSC control module
8
Accelerator pedal module
3
ECM (DME)
9
Brake light switch
4
Junction Box control unit
10
Steering column switch cluster
5
EMF
11
Instrument cluster
6
Gear Selector Lever (GWS)
Gear Selector Lever (GWS)
The automatic gearbox in the E70 is operated by means of an electric gearshift system.
This system is already known from the E65. Unlike in the E65, the gear selector lever in
the E70 is not on the steering column but rather in the usual position on the center
console.
The gear selector lever consists of the selector lever itself with indicator and the housing
with the control unit.
Operation and F
unctions
The shift pattern is modeled on the conventional BMW automatic gearbox. It features an
automatic gate and a manual gate. Only the parking lock is not engaged by pushing the
selector
lever forward but rather by pressing a button at the top of the selector lever.
The selector lever is monostable in both gates (manual and automatic). This means, after
being moved, the selector lever always returns to its initial position. In the manual gate
this is the same as automatic gearboxes with Steptronic.
10
E70 Transmissions
Index Explanation Index Explanation
1
Parking lock button
4
Selector lever
2
Indicator
5
Sport button for EDC
3
Unlock button
6
Parking brake
In addition to the one-touch function, the selector lever can also be pushed in the
automatic gate. This is comparable to the function of the direction indicator stalk in the
E90.
The drive range is changed by tapping the selector lever. A direct change from "D" to "R"
or vice versa can be achieved by tapping the selector lever twice or by pushing the lever.
The Unlock button is located on the left-hand side of the selector lever.
Haptic Locks
Electrically controlled, mechanically actuated locks ensure that the selector lever can only
be pushed in the logically possible direction, e.g. only forward from "D".
These locks are also used for the shift lock function, i.e. when a drive range can be
engaged only by pressing the unlock button. The selector lever is not locked if it is
necessary to depress the service brake in order to engage a drive range for example.
Instead, the function is not executed and a message appears in the on-board monitor
indicating: "Press brake to engage gear". The lock for moving the lever forward differs
from the lock for moving the lever back. The forward lock is a double lock and can
therefore prevent over-pressing the lever when a flick is possible.
In contrast to this, the backward lock can only completely prevent the movement.
Whenever the selector lever can be pulled back, it can also be pulled back beyond the
stop even if it no longer has a function.
The following graphics illustrate the operating options. The arrows indicate:
• Yellow arrow - Movement possible only with unlock button pressed.
• Grey arrow - Movement not possible.
• Green arrow - Movement possible.
11
E70 Transmissions
12
E70 Transmissions
Operating options of the gear selector lever
Shift from “P”
A drive range or neutral "N" can be engaged from "P"
only with the unlock button pressed and the service
brake depressed.
• Fully pressing forward selects the drive stage "R".
• Pressing forward selects the neutral position "N".
• Pressing back selects the drive range "D".
• Fully pressing back is possible but has no function
as “D" has already been engaged at this time.
The selector lever is not locked if the brake pedal is not
locked - movement is possible but the EGS will not
engage the drive range or "N".
Operating options of the gear selector lever
Shift from “N”
• Pressing forward selects the drive stage "R". This
is possible only with the unlock button pressed.
• Pressing back selects the drive range "D".
• Fully pressing back is possible but has no function
as "D" has already been engaged at this time.
Engaging a drive range from "N" at a speed < 5 km/h is
possible only with the service brake pressed. The selec-
tor lever, however, is not locked.
At a speed > 5 km/h, the drive range can be engaged in
the corresponding direction without having to press the
brake pedal.
Operating options of the gear selector lever
Shift from “D”
• Fully pressing forward selects the drive stage "R".
This is possible only with the unlock button
pressed. The EGS engages drive range "R" only
when the service brake is pressed and the speed
is < 5 km/h. Otherwise "N" is selected. The selec-
tor lever is therefore not locked.
•
P
ressing forward selects the neutral position "N".
• Pressing back is prevented by a lock.
•
P
ressing to the left selects the "M/S" gate.
Manual Gate, Sport Program (M/S)
As before, the sport program is engaged by shifting the selector lever to the left.
The selector lever locks in this position. The sport program can only be engaged
from "D".
Parking Lock "P"
The parking lock "P" is engaged by pressing the button at the top of the selector lever
when the vehicle speed is < 2 km/h.
The gearbox also automatically selects "P" as soon as the engine is turned off and "N" is
not engaged.
Automatic Downshift from "M/S"
The automatic downshift function returns the selector lever from the "M/S" gate to the
aut
omatic gate.
This occurs, for example, when the EGS signals gearbox position "P" as is the case when
the engine is shut down or the "P" button is pressed.
The selector lever remains locked in the "M/S" gate only if "S" or "M" mode is actually
active while driving in forward direction or the automatic downshift is defective or receives
no power supply.
5 downshift attempts are executed at intervals of approximately 5 seconds if the selector
lever is blocked from the outside, e.g. by an object.
If the downshift cannot be executed, the check control message: "Move selector lever
back int
o automatic gat
e" appears aft
er two attempts. A fault code memory entry is
generated.
13
E70 Transmissions
Operating options of the gear selector lever
Shift from “R”
• Pressing forward is prevented by a lock.
• Pressing back selects the neutral position "N".
• Pressing fully back selects the drive range "D".
The EGS engages drive range "D" only when the service
brake is pressed. Otherwise "N" is selected. The selec-
tor lever is therefore not locked.
Interface to EGS
With the aim of increasing availability, the gear selector lever position is sent via the
PT-CAN and LIN-bus. This means, a signal is still sent to the EGS should the PT-CAN
fail. This is not necessary for safety reasons.
Safety is guaranteed by neutrally complementary signals or alive counters. The gear
selector switch (GWS) is woken by a high-level on the PT-CAN wake-up line. The GWs
itself has no active wake-up capabilities.
Definition of Messages
Communication
The data blocks are sent both event controlled as well as cyclically on the PT-CAN.
They are sent only cyclically on the LIN-bus. Complementary signals are sent for the
purpose of securing the transmission link.
These signals are compared with the actual signals in the respective receive control unit.
Alive counters serve the purpose of detecting defects in the transmit control unit.
The alive counter in the respective receive control unit is monitored to establish whether
it remains at a constant value.
A plausibility check between the signals of the PT-CAN transmission and of the LIN-bus
does not take place in the receive control unit.
Safe Status for Sending
If a GWS-internal plausibility check determines that the position of the selector lever can
be transmitted incorrectly, the system assumes the safe status for sending the message
"Operation of gear selector lever".
Consequently, all signals of
this message are sent invalid on the PT-CAN and the
LIN-bus. If it is not possible to ensure that the signals can be sent invalid, the sending of
these messages is completely deactivated.
14
E70 Transmissions
Interface From To Message
PT-CAN GWS EGS Gear selector lever operation
PT-CAN EGS GWS Show gearbox data
LIN-bus GWS EGS Gear selector lever operation
LIN-bus EGS GWS Show gearbox data
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