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3-65
Fault code
(Hex)
Meaning of the fault code
possible reason for fault detection
Reaction of the TCU
Possible steps to repair
7F
O.C. at engine derating device
TCU detected a wrong voltage at the
output pin, that looks like a O.C. for this
output pin
Â
C a b l e i s d e fe c t i v e a n d h a s n o
connection to TCU
Â
Engine derating device has an internal
defect
Â
Connector has no connection to TCU
No reaction
OP mode : Normal
余
余
余
Check the cable from TCU to the
engine derating device
Check the connectors from engine
derating device to TCU
Check the resistance* of engine
derating device
* See page 3-74
81
S.C. to battery voltage at clutch K4
The measured resistance value of the
valve is out of limit, the voltage at K4 valve
is too high
Â
Cable/connector is defective and has
contact to battery voltage
Â
Cable/connector is defective and has
contact to another regulator output of
the TCU
Â
Regulator has an internal defect
TCU shifts to neutral
OP mode : Limp home
If failure at another clutch
is pending
TCU shifts to neutral
OP mode : TCU shutdown
余
余
余
余
Check the cable from TCU to the
gearbox
Check the connectors from gearbox
to TCU
Check the regulator resistance*
Check internal wire harness of the
gearbox
* See page 3-74
82
S.C. to ground at clutch K4
The measured resistance value of the valve
is out of limit, the voltage at K4 valve is too
low
Â
Cable/connector is defective and has
contact to vehicle ground
Â
Regulator has an internal defect
TCU shifts to neutral
OP mode : Limp home
If failure at another clutch
is pending
TCU shifts to neutral
OP mode : TCU shutdown
余
余
余
余
Check the cable from TCU to the
engine derating device
Check the connectors from gearbox
to TCU
Check the regulator resistance*
Check internal wire harness of the
gearbox
* See page 3-74
83
O.C. at clutch K4
The measured resistance value of the
valve is out of limit
Â
Cable/connector is defective and has
contact to TCU
Â
Regulator has an internal defect
TCU shifts to neutral
OP mode : Limp home
If failure at another clutch
is pending
TCU shifts to neutral
OP mode : TCU shutdown
余
余
余
余
Check the cable from TCU to the
gearbox
Check the connectors from gearbox
to TCU
Check the regulator resistance*
Check internal wire harness of the
gearbox
* See page 3-74
84
S.C. to battery voltage at clutch KV
The measured resistance value of the
valve is out of limit, the voltage at KV valve
is too high
Â
Cable/connector is defective and has
contact to battery voltage
Â
Cable/connector is defective and has
contact to another regulator output of
the TCU
Â
Regulator has an internal defect
TCU shifts to neutral
OP mode : Limp home
If failure at another clutch
is pending
TCU shifts to neutral
OP mode : TCU shutdown
余
余
余
余
Check the cable from TCU to the
gearbox
Check the connectors from gearbox
to TCU
Check the regulator resistance*
Check internal wire harness of the
gearbox
* See page 3-74
85
S.C. to ground at clutch KV
The measured resistance value of the valve
is out of limit, the voltage at KV valve is too
low
Â
Cable/connector is defective and has
contact to vehicle ground
Â
Regulator has an internal defect
TCU shifts to neutral
OP mode : Limp home
If failure at another clutch
is pending
TCU shifts to neutral
OP mode : TCU shutdown
余
余
余
余
Check the cable from TCU to the
gearbox
Check the connectors from gearbox
to TCU
Check the regulator resistance*
Check internal wire harness of the
gearbox
* See page 3-74
侍#
Some fault codes are not applied to this machine.
Summary of Contents for HL955
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