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speed exceeds the set speed limit when coasting downhill.
Notes:
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39
GA6HP26Z Automatic Transmission
Emergency Programs
The following designs of the GA6HP26Z are used to reduce faults:
" Reduction of system interfaces by using the Mechatronic (assembly)
" Redundant selector lever signals and monitoring (PT-CAN and hardwire)
" Multiple substitute programs
Substitute program 1: restricted gear selection
Substitute program 2: corresponds to previous emergency program with only forward,
reverse, neutral and park positions possible
Actuator (MV and EDS) deactivation: hydraulic/mechanical emergency operation
Electrical Emergency Program
The electrical emergency program shifts the transmission into 5th or 3rd gear (speed and
previous gear dependent) after a CAN bus failure. After restarting the engine, 3rd gear is
engaged when selecting position D. After a CAN bus failure, positions P, R, N and D are
selected via a separate serial line (hardwire).
Caution: The Shiftlock function is also deactivated, making it is possible to engage a gear
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:
without pressing the brake pedal. This is also indicated by a Check Control message.
When KL15 is switched OFF , position P will be engaged immediately at speeds below 2
km/h. This is because the "key inserted/key not inserted" signal is not detected. The N-hold
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function is not possible with "engine off" (Caution in car wash systems).
The instrument cluster can not detect a position change. The position indicator in the
instrument cluster is blanked out. The shift pattern with R, N, D remains and the arrows will
flash.
Notes:
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s
:
40
GA6HP26Z Automatic Transmission
Mechanical Emergency Program
The following applies in the event of total failure of the transmission control:
" No interruption in power transfer while driving forward (no gear changes)
" When the vehicle is stationary and "engine off": the parking lock will be engaged
The transmission electronics may still be in operation during the mechanical emergency
program, communication may also still be possible but the power supply to the actuators
(MV and EDS) is deactivated. The hydraulic system of the gearbox is designed so that
restricted operation is still possible.
It is not possible to reselect a drive position with the selector lever. This means the vehicle
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can only be driven forward within certain restrictions until the engine is switched off. A drive
position can not be engaged after turning the ignition off and restarting the engine.
p
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.
Vehicle safety is ensured because the parking lock engages when it is depressurized. As
soon as the pressure in the parking lock cylinder drops the parking lock system is preten-
sioned mechanically (operating lever spring). The mechanical parking lock will not engage
O
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at speeds > 5 km/h. Once engaged, the parking lock can only be released with the
mechanical emergency release.
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When the mechanical emergency program occurs:
" While driving forward, it is still possible to continue driving in 3rd/5th gear (3rd gear
when 1st, 2nd or 3rd gear was previously engaged, 5th gear when 4th, 5th or 6th gear
was engaged). This is interrupted by turning off the engine, the parking lock will engage
once the hydraulic pressure has dropped.
" While in reverse, the gearbox assumes the neutral position and the parking lock is en-
gaged (
" While in hydraulic neutral, the parking lock will engage (
" In position P, the gearbox remains in this status and the parking lock remains engaged.
The driver is informed of the different emergency situations by the Check Control mes-
sages.
41
GA6HP26Z Automatic Transmission
Feedback in the Event of a Failure
In the event of a total failure of the transmission control or the
SZL, the selector lever operation can not be detected or
implemented. In addition to the flashing shift pattern and the
corresponding error symbols (shown to the right) in the instru-
ment cluster, additional warnings will draw the driver's atten-
tion to the situation:
" Acoustic warning signal (gong)
" Acceleration limitation: This function reduces the start-off
acceleration when the vehicle begins to move. This function
is implemented by the ECM, depending on the restriction
or
of the transmission control by a request or by PT-CAN
timeout of the signals.
Workshop Hints
o
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The GA6HP26Z automatic gearbox requires oil
replacement every 100,000 miles. Only the
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1
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approved oil must be used for replacement or
after conducting repairs on the gearbox (consult
the Operating Fluids information). Check oil
level:
" The vehicle must be parked flat and level
" Check the oil level through fill plug (1) corre- 42-05-12
sponding to the Repair Instructions (TIS)
" Observe the oil temperature *
* Diagnosis of this gearbox is carried out with
the DISplus as part of the service and repair
work.
1
6
P
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P
N
9
8
8
6
2
4
6
8
A 16 Pin Adapter Cable PN 90 88 6 246 080 is
used in conjunction with break out box 88 88 6
611 459 to adapt to transmission harness.
42-05-16
42
GA6HP26Z Automatic Transmission
Check Control Messages
The E65 has different warning and information outputs depending on the driving situation
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