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CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
CHAPTER 2 TROUBLESHOOTING FOR CONTROL CIRCUITS
3.34 4 Att
3.3
Attach
Error code: H4
Error code: H4
Situation
Situation
Possible
Possible
cause
cause
Trigger of
Trigger of
the error
the error
code
code
Checks
Checks
(1)
(1)
(2) Sit on seat, then stop pump motor operation
(2) Sit on seat, then stop pump motor operation
If
If
fault
fault
(4) Turn off power. Sit on seat, then turn on power again
(4) Turn off power. Sit on seat, then turn on power again
without
without
I
I
f
f
f
f
a
a
(5) Turn off power
(5) Turn off power
MC
MC
specification
specification
(7) Disconnect connector E-36 of microswitch
(7) Disconnect connector E-36 of microswitch
Sit on seat, then turn on power again
Sit on seat, then turn on power again
If
If
fault
fault
(11) Disconnect battery plug, then perform inverter
(11) Disconnect battery plug, then perform inverter
discharging work
discharging work
(13) Check continuity between E-04-48 and E-36-5(121)
(13) Check continuity between E-04-48 and E-36-5(121)
Chec
Check shor
Continuity,
Continui
achmen
ment 2 Le
t 2 Lever
ver, Fa
, Fault
ulty Se
Display: "H4" flashes. Pump motor and power steering operations inhibited. Pump contactor OPEN if this fault
Display: "H4" flashes.
Pump motor and power steering operations inhibited. Pump contactor OPEN if this fault
occurs when turning on power. Pump contactor CLOSE if this fault
occurs when turning on power. Pump contactor CLOSE if this fault occurs during pump operation and then
OPEN if truck stops.
OPEN if truck stops.
Key switch turned on while operating attachment 2 lever, faulty
Key switch turned on while operating attachment 2 lever, faulty attachment 2 control lever or attachment 2
switch, faulty main harness, faulty logic unit, faulty input unit.
switch, faulty main harness, faulty logic unit, faulty input unit.
Detects attachment 2 control lever signal of CAN when turning on power (FC specification). Detects
Detects attachment 2 control lever signal of CAN when turning on
attachment 2 microswitch when turning on
attachment 2 microswitch when turning on power (MC specification).
If
If
this
this
fault
fault
occurred
occurred
during
during
pump
pump
motor
motor
operation
operation
remains
remains
(3)
(3) Fail-sa
Fail-safe
attachment
attachment
2
2
operation
opera
tion
u
u
l
l
t
t
r
r
e
e
m
m
a
a
i
i
n
n
s
s
E
E
r
r
r
r
o
o
r
r c
co
o
d
d
e
e
"
"
(6) Refer to error code
(6) Refer to error code
"54", "67" or "(L)"
"54", "67" or "(L)"
remains
remains
k
short circuit between E-
t circuit between
E-36-5
36-5
ty,
Not
Not
shorted
shorted
No
No
continui
continui
y Setti
tting (H
ng (H4) 4)
power (MC specification).
Normal
Normal
fe
function
function
54
54"
"
or
or
"
"
67"
67
"
or
or
"
"
(L)
(L)"
"
FC specification
FC specification
(8) Change attachment 2 control lever to other normal
(8) Change attachment 2 control lever to other normal
control lever
control lever
Normal
Normal
(9) Repair or replace
(9) Repair or replace
FC-IN harness
FC-IN harness
(12) Replace attachment 2 switch
(12) Replace attachment 2 switch
and
and
E-36-6
E-36-6
ty,
ty,
Shorted
Shorted
occurs during pump operation and then
attachment 2 control lever or attachment 2
power (FC specification). Detects
If
If
this
this
fault
fault
occurred
occurred
turning
turning
on
on
power
power
Not
Not
changed
changed
Error
Error
(10) Replace attachment
(10) Replace attachment
2
2
501164
501164
2-79
2-79
when
when
changed
changed
control lev
contro
l
lever
er
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