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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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