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CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
3. 3.7 7
PS Co
PS
Error code: E9
Error code: E9
Situation
Situation
Possible
Possible
cause
cause
Trigger of
Trigger of
the error
the error
code
code
Checks
Checks
(1) Let truck
(1) Let truck co
(8) Disconnect battery plug
(8) Disconnect battery plug
Wait until EPS controller temperature becomes close to
Wait until EPS controller temperature becomes close to
room t
room t
(10) Perform inverter discharging work
(10) Perform inverter discharging work
Cont ntro roll ller er,O ,Ove
verh rhea
eati ting
ng (E (E9) 9)
Controller/m
Controller/motor overheat indicator ON. Poor pulling
otor overheat indicator ON. Poor pulling power and acceleration. Normal pump motor. Service
tool "Alarm status" and "E9" displayed.
tool "Alarm status" and "E9"
Overheating of PS controller, faulty PS controller thermal sensor, open harness wiring, faulty PC board,
Overheating of PS controller, faulty PS controller thermal sensor, open harness wiring, faulty PC board,
abnormal power supply of logic unit, faulty radiation of left traction inverter, faulty display
abnormal power supply of logic unit,
Controller temperature is out of
Controller temperat
ure is out of range of -25 °C
range of -25 °C to 110 °C (-13 °F to 230 °F).
range of -25 °C to 110 °C (-13
cool for
ol for
15 minutes
15 minutes
and turn the key off
and turn the key off
O
O
v
v
e
e
r
r
h
h
e
e
a
a
t
t
i
i
n
n
d
d
i
i
c
c
a
a
t
t
o
o
r
r
O
O
N
N
With service tool
With service tool
Without service tool
Without service tool
emperatur
emperature
e
power and acceleration. Normal pump motor. Service
displayed.
faulty radiation of left traction inverter, faulty display unit.
range of -25 °C to 100 °C
to 100 °C (-13 °F to 212
(-13 °F to 212 °F). Capacitor temperature is out of
°F to 230 °F). Recovers when tempe
Recovers when temperature is in range of -20 to 70 °C (-4
and on
and on
(2) Left traction inverter becomes normal
(2) Left traction inverter becomes normal
(3) Check if truck is operated on steep upgrade or to pull
(3) Check if truck is operated on steep upgrade or to pull
large cargo load
large cargo load
(4) Perform inverter discharging work
(4) Perform inverter discharging work
Check thermal paste applied on inverter mounting
Check thermal paste applied on inverter mounting
Surface
Surface
Thermal paste film should be thin
Thermal paste film should be thin
(
(
5)
5)
R
R
ep
epla lac
(7) Confirm temperature of controller and head capacitor
(7) Confirm temperature of controller and head capacitor
with input monitor
with input monitor
Less
Less
than
than
o
o
r m
r
mo
o
°F). Capacitor temperature is out of
rature is in range of -20 to 70 °C (-4 to 158 °F).
O
O
v
v
e
e
r
r
h
h
e
e
a
a
t
t
i
i
n
n
d
d
i
i
c
c
a
a
t
t
o
o
r
r
O
O
F
F
If problem reoccurs
If problem reoccurs
Normal
Normal
and even
and even
Normal
Normal
c
e
e E
EP
P
S
S c
con
ontr trol olle ler
r
(
(
6)
6)
C
C
le lean
surface,
surface,
apply thermal paste,
apply thermal paste,
then reinstall EPS
then reinstall EPS
controller
controller
-20
-20
°C(-
°C(-
4
4
°F)
°F)
r
r
e
e t
th
h
a
a
n
n
7
7
0
0
°
°
C
C
(
(
1
1
5
5
8
8 °
°F
F
)
)
(
(
(9) Normal
(9) Normal
501137
501137
2-21
2-21
unit.
to 158 °F).
F
F
Abnormal
Abnormal
an
moun
mo
unti ting
ng
-20
-20
°C
°C
to
to
70
70
°C
°C
- 4
- 4
°
°
F t
F
to
o
1
1
5
5
8 °
8
°F
F
)
)
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