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
B8
OVERTEMP RETARDER
TCU measured a
temperature in the retarder
oil that is over the allowed
threshold.
TCU disables retarder
OP-Mode: normal
cool down machine
check oil level
check temperature
sensor
B9
OVERSPEED 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
check wiring from TCU
to differential pressure
switch
check differential
pressure switch
(measure resitance)
Fault
Code
(hex)
MEANING OF THE FAULT
CODE
Possible reason for fault
detection
Reaction of the
TCU
Possible steps
to repair
Remarks
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