SHOP MANUAL
Ch 6 page 44
ELECTRICAL SYSTEM
Load weighing (32)
When the body is lifted the tip up drive is limited to 400mA during the measurement phase.
The measure time will last for minimum 0.6sec after the highest pressure is detected. Typical total mea-
suring time is <1sec.
The pressure is calculated from both A and B pressures.
The load is registered and counted in the VCU2 if the weighing value is >= 3.0t.
The next registration is not possible before the vehicle has traveled > 50m or after a timeout of 3 min-
utes.
Amber/red symbol indicates overload with the following values:
DA30 = 28,1 t.
DA40 = 40 t.
Differential lock (28)
The center differential lock is controlled via the canbus to the ZF TCU.
The rear difflock (DA30 only) is controlled by the VCU2 using a solenoid valve in the hydraulic
system.
The center and rear differential lock buttons on the panel are requests for difflock.
The differential lock are engaged only if conditions are in valid ranges.
If differential lock is released automatically due to protection the panel buttons (requests) will
also be forced off.
The criteria for engaging the center differential lock is:
Vehicle speed <18km/h
Transmission input torque < 1000Nm
The center differential lock will automatically disengage if vehicle speed >20km/h.
The criteria for engaging the rear differential lock (DA30 only) is:
Vehicle speed <8km/h
Transmission input torque must be in range -500Nm to +1000Nm
Center differential lock must also be engaged.
The rear differential lock will automatically disengage if vehicle speed >12km/h or if center
differential lock is released.
The front differential is a limited slip locking type.
On the DA40 the rear differential is a limited slip locking type.
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