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Fault code
Meaning of the fault code
(Hex)
possible reason for fault detection
A1
S.C. to ground at difflock or axle
connection solenoid
TCU detected a wrong voltage at the
output pin, that looks like a S.C. to vehicle
ground
Cable is defective and is contacted to
vehicle ground
Difflock solenoid has an internal defect
Connector pin is contacted to vehicle
ground
A2
S.C. to battery voltage at difflock or axle
connection solenoid
TCU detected a wrong voltage at the
output pin, that looks like a S.C. to battery
voltage
Cable is defective and has no
connection to battery voltage
Difflock solenoid has an internal defect
Connector pin is contacted to battery
voltage
A3
O.C. at difflock or axle connection
solenoid
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
Difflock solenoid has an internal defect
Connector has no connection to TCU
A4
S.C. to ground at warning signal output
TCU detected a wrong voltage at the
output pin, that looks like a S.C. to vehicle
ground
Cable is defective and is contacted to
vehicle ground
Warning device has an internal defect
Connector pin is contacted to vehicle
ground
A5
O.C. voltage at warning signal output
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
Warning device has an internal defect
Connector has no connection to TCU
A6
S.C. to battery voltage at warning signal
output
TCU detected a wrong voltage at the
output pin, that looks like a S.C. to battery
voltage
Cable is defective and has is contacted
to battery voltage
Warning device has an internal defect
Connector pin is contacted to battery
voltage
Reaction of the TCU
No reaction
OP mode : Normal
No reaction
OP mode : Normal
No reaction
OP mode : Normal
No reaction
OP mode : Normal
No reaction
OP mode : Normal
No reaction
OP mode : Normal
3-28
Possible steps to repair
Check the cable from TCU to the
difflock solenoid
Check the connectors from difflock
solenoid to TCU
Check the resistance* of difflock
solenoid
* See page 3-36
Check the cable from TCU to the
difflock solenoid
Check the connectors from difflock
solenoid to TCU
Check the resistance* of difflock
solenoid
* See page 3-36
Check the cable from TCU to the
difflock solenoid
Check the connectors from difflock
solenoid to TCU
Check the resistance* of difflock
solenoid
* See page 3-36
Check the cable from TCU to the
warning device
Check the connectors from
warning device to TCU
Check the resistance* of warning
device
* See page 3-36
Check the cable from TCU to the
warning device
Check the connectors from
warning device to TCU
Check the resistance* of warning
device
* See page 3-36
Check the cable from TCU to the
warning device
Check the connectors from
warning device to TCU
Check the resistance* of warning
device
* See page 3-36
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