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3-70
Fault code
(Hex)
Meaning of the fault code
possible reason for fault detection
Reaction of the TCU
Possible steps to repair
B3
Slippage at clutch K3
TCU calculates a differential speed at
closed clutch K3. If this calculated value
is out of range, TCU interprets this as
slipping clutch
·
Low pressure at clutch K3
·
Low main pressure
·
Wrong signal at internal speed sensor
·
Wrong signal at output speed sensor
·
Wrong size of the sensor gap
·
Clutch is defective
TCU shifts to neutral
OP mode : Limp home
If failure at another clutch
is pending
TCU shifts to neutral
OP mode : TCU shutdown
·
·
·
·
·
·
Check pressure at clutch K3
Check main pressure in the system
Check sensor gap at internal speed
sensor
Check sensor gap at output speed
sensor
Check signal at internal speed
sensor
Check signal at output speed
sensor
Replace clutch
B4
Slippage at clutch K4
TCU calculates a differential speed at
closed clutch K4. If this calculated value
is out of range, TCU interprets this as
slipping clutch
·
Low pressure at clutch K4
·
Low main pressure
·
Wrong signal at internal speed sensor
·
Wrong signal at turbine speed sensor
·
Wrong size of the sensor gap
·
Clutch is defective
TCU shifts to neutral
OP mode : Limp home
If failure at another clutch
is pending
TCU shifts to neutral
OP mode : TCU shutdown
·
·
·
·
·
Check pressure at clutch K4
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
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
TCU shifts to neutral
OP mode : Limp home
If failure at another clutch
is pending
TCU shifts to neutral
OP mode : TCU shutdown
·
·
·
·
·
·
·
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
B6
Slippage 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
TCU shifts to neutral
OP mode : Limp home
If failure at another clutch
is pending
TCU shifts to neutral
OP mode : TCU shutdown
·
·
·
·
·
·
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
B7
Overtemp sump
TCU measured a temperature in the oil
sump that is over the allowed threshold.
No reaction
OP mode : Normal
·
·
·
Cool down machine
Check oil level
Check temperature sensor
B9
Overspend engine
Retarder applies
OP mode : Normal
-
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
No reaction
OP mode : Normal
·
·
·
Check oil filter
C h e c k w i r i n g f r o m T C U t o
differential pressure switch
C h e c k d i f fe r e n t i a l p r e s s u r e
switch(Measure resistance)
※
Some fault codes are not applied to this machine.
Summary of Contents for HL955
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