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Fault code
Meaning of the fault code
(Hex)
possible reason for fault detection
B5
Slippage at clutch KV
TCU calculates a differential speed at
closed clutch KV. If this calculated value
is out of range, TCU interprets this as
slipping clutch
Low pressure at clutch KV
Low main pressure
Wrong signal at internal speed sensor
Wrong signal at turbine speed sensor
Wrong size of the sensor gap
Clutch is defective
B6
S
S
lippage at clutch KR
TCU calculates a differential speed at
closed clutch KR. If this calculated value
is out of range, TCU interprets this as
slipping clutch
Low pressure at clutch KR
Low main pressure
Wrong signal at internal speed sensor
Wrong signal at turbine speed sensor
Wrong size of the sensor gap
Clutch is defective
B7
O
O
vertemp sump
TCU measured a temperature in the oil
sump that is over the allowed threshold.
B8
Overtemp retarder
TCU measured a temperature in the
retarder oil that is over the allowed
threshold
B9
Overspend engine
BA
Differential pressure oil filter
TCU measured a voltage at differential
pressure switch out of the allowed range
Oil filter is polluted
Cable/connector is broken or cable/
connector is contacted to battery voltage
or vehicle ground
Differential pressure switch is defective
Reaction of the TCU
TCU shifts to neutral
OP mode : Limp home
If failure at another clutch is
pending
TCU shifts to neutral
OP mode : TCU shutdown
TCU shifts to neutral
OP mode : Limp home
If failure at another clutch is
pending
TCU shifts to neutral
OP mode : TCU shutdown
No reaction
OP mode : Normal
TCU disables retarder
OP mode : Normal
Retarder applies
OP mode : Normal
No reaction
OP mode : Normal
3-30
Possible steps to repair
Check pressure at clutch KV
Check main pressure in the
system
Check sensor gap at internal
speed sensor
Check sensor gap at turbine
speed sensor
Check signal at internal speed
sensor
Check signal at turbine speed
sensor
Replace clutch
Check pressure at clutch KR
Check main pressure in the
system
Check sensor gap at internal
speed sensor
Check sensor gap at turbine
speed sensor
Check signal at internal speed
sensor
Check signal at turbine speed
sensor
Replace clutch
Cool down machine
Check oil level
Check temperature sensor
Cool down machine
Check oil level
Check temperature sensor
-
Check oil filter
Check wiring from TCU to
differential pressure switch
Check differential pressure
switch(Measure resistance)
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