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Fault code
Meaning of the fault code
(Hex)
possible reason for fault detection
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
Cable is defective and has no
connection to TCU
Engine derating device has an internal
defect
Connector has no connection to TCU
85
S
S
.C. to ground at clutch KV
The measured resistance value of the valve
is out of limit, the voltage at K4 valve is too
low
Cable/connector is defective and has
contact to vehicle ground
Regulator has an internal defect
86
O
O
.C. at clutch KV
The measured resistance value of the
valve is out of limit
Cable/connector is defective and has
contact to TCU
Regulator has an internal defect
87
S
S
.C. to battery voltage at clutch KR
The measured resistance value of the
valve is out of limit, the voltage at KR valve is
too high
Cable/connector is defective and has
contact to battery voltage
Cable/connector is defective and has
contact to another regulator output of the
TCU
Regulator has an internal defect
Reaction of the TCU
No reaction
OP mode : Normal
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
TCU shifts to neutral
OP mode : Limp home
If failure at another clutch is
pending
TCU shifts to neutral
OP mode : TCU shutdown
3-23
Possible steps to repair
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 3-36
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 3-36
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 3-36
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 3-36
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