Daf LF.book - Peterbilt Motors Company

Automatic Gearbox
Gearbox
The ECU will block the functions of the selector and the gearbox will select a "safe
gear" for the gearbox. It is important to drive the vehicle to a safe place as soon as
possible and turn the contact off. It will no longer be possible to shift the gearbox to
neutral. The ECU will prevent this.
After approximately 30 seconds, try starting the engine again and engaging a gear.
If the fault is one whereby the gearbox must in no circumstances be shifted, the
ECU will no longer shift the gearbox. Driving is therefore no longer possible!
If the fault is one whereby the gearbox may still be shifted, the warning in the main
display will disappear. The ECU will have recorded the fault as an inactive fault.
It is now possible to drive the vehicle again, though the fault will still need to be
remedied.
In this situation, however, it is no longer possible to shift gears.
Gearbox oil temperature
If the transmission fault warning symbol in the master display comes on during
driving, this could be an indication that the gearbox oil has reached its maximum
temperature.
In this situation, the ECU limits gearbox shifting to the first four gears.
It is important to drive to a safe place as soon as possible and let the engine idle in
neutral at an increased idling speed.
As a result, the cooling system of the engine will try to cool the gearbox oil.
If after approximately two minutes the warning in the master display has not
disappeared, the engine must be turned off and contact made with the nearest
authorized Service dealer.
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