2000 MITSUBISHI MONTERO Service Repair Manual

HEATER, AIR CONDITIONER AND VENTILATION - Troubleshooting55A-7
TROUBLESHOOTING
Trouble symp-
tomProbable causesRemedyRefer-
ence
page
The rear cool-Malfunction of fuseReplace the fuse.–
er does notMalfunction of harness or connectorRepair the harness or connector.–operate.
Refrigerant leak or overfilling of refrigerantReplenish the refrigerant, repair the leak
or take out some of the refrigerant.–
Malfunction of the rear A/C switchReplace the rear A/C switch.55A-32
Malfunction of the front rear fan switchReplace the front rear fan switch.55A-33
Malfunction of the air thermo sensorReplace the air thermo sensor.55A-39
Malfunction of the rear blower relayReplace the rear blower relay.55A-18
The rear blower motor is defective.Replace the rear blower motor.55A-40
The rear cooler control unit is defective.Replace the rear cooler control unit.55A-34
When the rear
cooler is oper-
ating, temper-
ature inside
the passenger
compartment
does not de-
crease(cool air
is not emitted).Refrigerant leakReplenish the refrigerant and repair the
leak.–
When the rear
heater is oper-
ating, temper-
ature inside
the passenger
compartment
does not in-
crease(warm
air is not
emitted).Malfunction of the air thermo sensorReplace the air thermo sensor.55A-39
The blowerMalfunction of fuseReplace the fuse.–
motor does notMalfunction of harness or connectorRepair the harness or connector.–run.
Malfunction of the rear blower relayReplace the blower relay.55A-18
The rear blower motor is defective.Replace the blower motor.55A-40
Malfunction of the rear A/C switchReplace the rear A/C switch.55A-32
Malfunction of the front rear fan switchReplace the front rear fan switch.55A-33
Malfunction of the resistorReplace the resistor.55A-35
The rear cooler control unit is defective.Replace the rear cooler control unit.55A-34
The blowerMalfunction of fuseReplace the fuse.–
motor does notMalfunction of harness or connectorRepair the harness or connector.–stop running.
Malfunction of the rear A/C switchReplace the rear A/C switch.55A-32
Malfunction of the front rear fan switchReplace the front rear fan switch.55A-33
Malfunction of the resistorReplace the resistor.55A-35
The rear cooler control unit is defective.Replace the rear cooler control unit.55A-34


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C
heck it e m C
heck co ndit io ns N
orm alco ndit io n 1 M
agnet va lv e M
agnet va lv e :O FF S
yste m vo lt a ge M
agnet va lv e :O N F
ain t vo lt a ge (0 .5 V) 2 E
arth A
tall tim es C
ontin uit y 3 I
n putfr o m te m pera tu re adju stin g sw it c h T
e m pera tu re adju stin g sw it c h : M AX.
H O T 1
V T
e m pera tu re adju stin g sw it c h : MAX.
C O OL 4
V 4 P
ow er su pply to pote ntio m ete r A
tall tim es 5
V 5 P
ow er su pply to ig nit io n sw it c h (IG 2) I
g nit io n sw it c h : O N S
yste m vo lt a ge 6 E
le ctr ic m oto r fo r th e air m ix dam per
( M AX.C O OL) W
hen th e dam per fla p is m ovin g to th e
M AX.C O OL posit io n. 1
0 V W
hen th e dam per fla p is m ovin g to th e
M AX.H O T posit io n. F
ain t vo lt a ge (0 .5 V) 7 I
n put fr o m pote ntio m ete r fo r air mix A
ir m ix dam per: M AX.H O T 1
V d
am per A
ir m ix dam per: M AX.C O OL 4
V 8 E
arth to se nso r and pote ntio m ete r A
tall tim es 0
V 9 S
ig nal fr o m air outle t ch angeove r
d am per m oto r I
g nit io n sw it c h : O N 0
–12 V 1
0 S
ig nal fr o m air outle t ch angeove r
d am per m oto r I
g nit io n sw it c h : O N 0
–12 V 1
1 S
ig nal fr o m air outle t ch angeove r
d am per m oto r I
g nit io n sw it c h : O N 0
–12 V 1
2 I
n putfr o m air th erm ose nso r S
enso r te m pera tu re : 25_C (1 .5 kW) 2
.2 V 1
3 I
n putfr o m re arfa n sw it c h and fr o ntre ar
f a n sw it c h R
ear fa n sw it c h or fr o ntre arfa n sw it c h :
O N 0
V 1
4 E
le ctr ic m oto r fo r th e air m ix dam per
( M AX.H O T) W
hen th e dam per fla p is m ovin g to th e
M AX.C O OL posit io n. F
ain t vo lt a ge (0 .5 V) W
hen th e dam per fla p is m ovin g to th e
M AX.H O T posit io n. 1
0 V

O
N-V EH IC LE SER VIC E
R EFR IG ER ANT LE VEL TE ST TH RO UG H
P ER FO RM ANCE TE ST
1 . Park th e ve hic le to be te ste d in apla ce th at is not in
d ir e ct su nlig ht.
2 . Set co ndit io ns fo r outs id e air te m pera tu re as fo llo w s:
D ry -b ulb te m pera tu re : 22
_C
or m ore
R ela tiv e hum id it y : 60 to 100%
3 . Clo se all of th e doors wit h th e win dow s fu lly clo se d.
4 . Clo se th e va lv e s of th e gauge manif o ld .
5 . Connect th e ch arg in g hose (re d) to th e gauge manif o ld
( h ig h-p re ssu re sid e)a nd th e quic k jo in t(fo rh ig h-p re ssu re )
t o th e end of th e hose .
6 . Connect th e ch arg in g hose (b lu e) to th e gauge manif o ld
( lo w -p re ssu re sid e) and th e quic k jo in t (fo r lo w -p re ssu re )
t o th e end of th e hose .
7 . Connect th e quic k jo in ts to th e appro pria te se rv ic e va lv e s
o f th e ve hic le .
C au tio n
T o co nnect th e quic k jo in t, pre ss sectio n “A ” fir m ly
a g ain st th e serv ic e valv e until a clic k is heard .
W hen co nnectin g,ru n yo ur han d alo ng th e hose while
p re ssin g th e sectio n “A ” to en su re th at th ere are no
b en ds in th e hose.
8 . Sta rt th e engin e.
9 . Turn th e blo w er sw it c h to HI posit io n.
1 0. Turn on th e A/C sw it c h , and se t th e A/C co ntr o l to MAX.
C O OL.
1 1 . Set th e air outle t ch angeove r to FA C E mode and th e
i n sid e air /o uts id e air ch angeove r to th e in sid e air
r e cir c u la tio n mode.
1 2. Adju st th e engin e sp eed to 1,5 00 r/m in .
1 3. C heck if th e outs id e air te m pera tu re and air te m pera tu re
b lo w n out of FA C E duct, and th e outs id e air te m pera tu re
a nd re fr ig era ntp re ssu re (h ig h-p re ssu re and lo w -p re ssu re
s id es) are wit h in th e norm al va lu e ra nge sh ow n in th e
g ra phs.
1 4. If th e te m pera tu re and pre ssu re are belo w th e giv e n ra nge,
r e ple nis h th e re fr ig era nt. If above , dra in th e re fr ig era nt.
( F or ch arg in g, re fe r to P.5 5A -1 1 .)
N O TE
I n th e gra ph belo w , se e th e fo llo w in g:
[ A ]: Refr ig era nt pre ssu re (h ig h-p re ssu re sid e)
[ B ]: Refr ig era nt pre ssu re (lo w -p re ssu re sid e) 1
5 20 25 30 (
_ C
)
3 5 40
A
ir te m pera tu re out of FA CE duct (
_ C
)
0 4 8
1
2
1
6
1 5 20 25 30
(_ C
)
3
5 40
k
P a
kP a N
orm al
O uts id e air te m pera tu re L
ow -p re ssu re sid e
4
90
9
81
1
471
1
961
2
452
2
942
0 9
8
1
96
2
94
3
92
4
90
5
88
0 6
86
O uts id e air te m pera tu re
[
A ] [
B ]
w
ww.W ork sh opM an uals .c o .u k
P urc h ased f r o m w ww.W ork sh opM an uals .c o .u k

O
FF 3
140
± 2
00
k P a 2
550
± 2
00

A
dapto r va lv e V
alv e open
V alv e clo se
C harg in g
v a lv e
S erv ic e ca n C
harg in g va lv e
S erv ic e ca n
( R efr ig era nt
c o nta in er)
Low -p re ssu re
s e rv ic e va lv e
w
ww.W ork sh opM an uals .c o .u k
P urc h ased f r o m w ww.W ork sh opM an uals .c o .u k

Q
uic k jo in t (fo r
l o w -p re ssu re )
L ow -p re ssu re
s e rv ic e va lv e
w
ww.W ork sh opM an uals .c o .u k
P urc h ased f r o m w ww.W ork sh opM an uals .c o .u k

S
le eve
C harg in g hose (b lu e)
Quic k jo in t
L ow -p re ssu re
s e rv ic e va lv e
O il A
dapto r va lv e
A
w
ww.W ork sh opM an uals .c o .u k
P urc h ased f r o m w ww.W ork sh opM an uals .c o .u k