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Fault code
Meaning of the fault code
(Hex)
possible reason for fault detection
88
S.C. to ground at clutch KR
The measured resistance value of the valve
is out of limit, the voltage at KR valve is too
low
Cable/connector is defective and has
contact to vehicle ground
Regulator has an internal defect
89
O
O
.C. at clutch KR
The measured resistance value of the
valve is out of limit
Cable/connector is defective and has no
contact to TCU
Regulator has an internal defect
91
S
S
.C. to ground at relay reverse warning
alarm
TCU detected a wrong voltage at the
output pin, that looks like a S.C. to vehicle
ground
Cable is defective and is contact to
vehicle ground
Backup alarm device has an internal
defect
Connector pin is contacted to vehicle
ground
92
S
S
.C. to battery voltage at relay reverse
warning alarm
TCU detected a wrong voltage at the
output pin, that looks like a S.C. to battery
voltage
Cable is defective and is contacted to
battery voltage
Backup alarm device has an internal
defect
Connector pin is contacted to battery
voltage
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
Backup alarm will be on until
TCU power down even if fault
vanishes(Loose connection)
OP mode : Normal
No reaction
OP mode : Normal
3-24
Possible steps to repair
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
backup alarm device
Check the connectors from
backup alarm device to TCU
Check the resistance* of backup
alarm device
* See page 3-36
Check the cable from TCU to the
backup alarm device
Check the connectors from
backup alarm device to TCU
Check the resistance* of backup
alarm device
* See page 3-36
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