TCM FB-8 Series, Service Manual

Page: 208 / 259

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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 ener
gizing protection 1.
The EPS power steering output is limited.
Automatically reset when the input returns to normal.
1-ton class trucks:
32
A
o
r m
or
e
co
nt
in
ue
s f
or
at least 5 seconds.
2-ton class trucks:
36
A
o
r m
or
e
co
nt
in
ue
s f
or
at least 6 seconds.
3-ton class trucks:
34
A
o
r m
or
e
co
nt
in
ue
s f
or
at least 7 seconds.
17
63
Continuous ener
gizing 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.
Th
e
te
m
p.
d
ro
ps
b
el
ow
1
10
°C
[230°F].
The temp. rises above 1
15°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