Controls and Instruments
55
CAUTION
In order to protect the engine from damaged
caused by overspeed, the system effects an
upshift during automatic driving operation
and, depending on vehicle type, also during
manual driving operation. The vehicle can
accelerate during downhill driving.
CAUTION
The engine may be damaged if the vehicle is
accelerated on downhill gradients and the
engine thereby enters the overspeed range.
Depending on type of vehicle, there is no auto-
matic gear shifting to a higher gear during down-
hill driving in manual operation. In this case,
make sure that the engine speed does not ex-
ceed the permissible speed range.
ZF-ASTRONIC DISPLAY
The display provides information on the status of
the transmission.
Operating Displays
07100
Automatic mode is shown in the
display by means of 2 bars and 2
arrows (8th gear is selected in
transmission).
07083
Manual mode
4th gear selected in transmission
(No bars or arrows).
07121
Transmission in neutral position
07122
Reverse gear is engaged
07101
“CH” = system self-check appears
on display when ignition is ON.
Warning Displays
07102
“AL” = airless
Alternates with the normal display.
The transmission compressed air
system has insufficient pressure.
NOTE
Only leave once there is sufficient pressure in
the pneumatic system. If pressure is too low
when the vehicle stops, do not engage the
clutch otherwise the engine will “stall”.
WARNING
If shifts are undertaken when pneumatic
pressure is too low, the transmission may
remain in neutral to ensure that there is no
direct drive and that the engine brake is
effective.
07103
“FP” = accelerator pedal
Move accelerator to idling position.
If the display does not go out, there
is a system error. Vehicle cannot
be driven any further.
07104
“CL” = clutch
Alternates with the normal display.
Clutch is overloaded.
See “CLUTCH PROTECTION”
07105
“CW” = clutch wear
Visit nearest specialist workshop to
replace the clutch.
07123
“HT” = High temperature
07124
“EE” = Electronic Error
Is displayed when communication
between the display and the
transmission electronics is dis-
turbed
07125
“--” = Display Error
Is displayed when communication
between the display and the
transmission electronics is dis-
turbed
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