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3. TROUBLESHOOTING GUIDE
(3) EPS Power steering system (1/2)
Error code
on display
Error description Problem Resetting Error code conditions
LED
code
Page
506
EPS transistor short-circuited
The travel, load-handling and EPS
(power steering) systems are inoperative.
Contactor OFF.
Turn the key switch OFF. 05 63
EPS transistor short-circuited
(after startup)
The travel, load-handling and EPS
(power steering) systems are inoperative.
Contactor OFF.
Turn the key switch OFF. 06 63
EPS transistor short-circuited
(Lower)
The travel, load-handling and EPS
(power steering) systems are inoperative.
Contactor OFF.
Turn the key switch OFF. 07 63
EPS transistor short-circuited
(Upper)
The travel, load-handling and EPS
(power steering) systems are inoperative.
Contactor OFF.
Turn the key switch OFF. 08 63
507 EPS transistor open
The EPS power steering system won’t
work.
Turn the key switch OFF. 04 63
508
Continuous energizing protection 1.
The EPS power steering output is
limited.
Automatically reset when the
input returns to normal.
1-ton class trucks: 32A or more continues for
at least 5 seconds.
2-ton class trucks: 36A or more continues for
at least 6 seconds.
3-ton class trucks: 34A or more continues for
at least 7 seconds.
17 63
Continuous energizing protection 2.
The EPS power steering output is
limited.
Automatically reset when the
input returns to normal.
1-ton class trucks: 8A or more continues for
at least 60 seconds.
2-ton class trucks: 8A or more continues for
at least 60 seconds.
3-ton class trucks: 7A or more continues for
at least 60 seconds.
19 63
509
Torque sensor defective
(Short-circuited)
The EPS power steering system won’t
work.
Turn the key switch OFF.
22
25
64
Torque sensor defective
(Open)
The EPS power steering system won’t
work.
Turn the key switch OFF.
23
26
64
- DM open
The EPS power steering system stops
working.
Turn the key switch OFF. 09 64
- FET temp. too high
The EPS power steering output is
limited.
The temp. drops below 95°C
[203°F].
The temp. rises above 100°C [212°F]. 11 64
- FET temp. abnormal
The EPS power steering system stops
working.
The temp. drops below 110°C
[230°F].
The temp. rises above 115°C [239°F]. 12 64
- FET1 thermosensor defective Only operates at ambient temperature. Turn the key switch OFF. 13 64
-
FET2 thermosensor defective
Only operates at ambient temperature.
Turn the key switch OFF. 14 64
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