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CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
3. 3.3 3
Pump
Pu
Error code: E2
Error code: E2
Situation
Situation
Possible
Possible
cause
cause
Trigger of
Trigger of
the error
the error
code
code
Checks
Checks
(1) Let truck cool for 15 minutes
(1) Let truck cool for 15 minutes
(9) Disconnect battery plug
(9) Disconnect battery plug
Wait until
Wait until
room t
room t
(11) Perform inverter discharging work
(11) Perform inverter discharging work
(12)
(12) Dis
Disconn
speed and thermal sensor. Measure resistance
speed and thermal sensor. Measure resistance
between
between E
2.2kΩ at 70°C
2.2kΩ at 70°C
82kΩ
82kΩ
mp Mo
Moto tor, r,Ov
Over erhe
heat atin ing( g(E2
Controller/motor overheat indicator ON. Lifting
Controller/m
otor overheat indicator ON. Lifting speed slower than normal.
steering operations. Service tool "Alarm status" and "E2" displayed.
steering operations. Service tool "Alarm status" and "E2" displayed.
Overheating of pump motor, faulty pump motor or thermal sensor, faulty
Overheating of pump motor, faulty pump motor or thermal sensor, faulty or open harness wiring, faulty p
motor inverter DSP card, abnormal power supply of logic unit,
motor inverter DSP card, abnormal power supply of logic unit, abnormal oil pressure of gear pump or hydraulic
lines, faulty display unit.
lines, faulty display unit.
Motor temperature is out of range of -25 °C to 145
Motor tempera
ture is out of range of -25 °C to 145 °C (-13 °F to 293 °F).
Recovers when motor temperature is in range of -20 to 70 °C (-4 to
Recovers when motor te
mperature is in range of -20 to 70 °C (-4 to 158 °F).
Overheat
Overheat
indicator
indicator
ON
ON
With service tool
With service tool
Without service tool
Without service tool
pump
pump
motor t
motor t
emperaturebecomes clos
emperaturebecomes
emperature
emperatur
e
connect connec
ect
connector E-16
tor E-16
of pump
of pump
E-16-2
-16-2
and E-16-1
and E-16-1
(158°F) to
(158°F) to
at
at
-20°C
-20°C
(-4°F)
(-4°F)
Out
Out
E2) )
speed slower than normal. Normal traction motorand power
°C (-13 °F to 293 °F).
(2) Pump motor becomes normal
(2) Pump motor becomes normal
(3) Check if truck is operated to lift large cargo load
(3) Check if truck is operated to lift large cargo load
(4) Perform inverter discharging work
(4) Perform inverter discharging work
(5) Check oil pressure of gear pump and hydraulic lines
(5) Check oil pressure of gear pump and hydraulic lines
(6) Replace pump motor
(6) Replace pump motor
(8) Co
(8)
Confirm temperature of pump
input/output monitor
input/output monitor
Less
Less
or
or
m
m
close t
e t
o
o
motor
motor
of
of
range
range
(13) Replace pump motor
(13) Replace pump motor
Normal traction motorand power
or open harness wiring, faulty pump
abnormal oil pressure of gear pump or hydraulic
158 °F).
Overheat
Overheat
indicator
indicator
OFF
OFF
If problem reoccurs
If problem reoccurs
Normal
Normal
Normal
Normal
(7) Repair or replace
(7) Repair or replace
gear pump or piping
gear pump or piping
nfirm temperature of pump
motor with
motor with
than
than
-20
-20
°C(-
°C(-
4
4
°F)
°F)
-20
-20
o
o
re
re
t
t
han
ha
n
70
70
°
°
C
C
(1 (15
5
8
8
°
°
F
F
)
)
(-4
(-4
(10) Normal
(10) Normal
501136
501136
2-9
2-9
ump
Abnormal
Abnormal
°C
°C
to
to
70
70
°C
°C
°
°
F t
F
to
o
15
158 °
8
°F)
F)
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