2000 MITSUBISHI MONTERO Service Repair Manual

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HEATER, AIR
CONDITIONER AND
VENTILATION

Click on the applicable bookmark to selected the required model year.


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55B-1
HEATER, AIR
CONDITIONER AND
VENTILATION

CONTENTS
SERVICE SPECIFICATIONS 2.................
LUBRICANTS 2..............................
SPECIAL TOOLS 3...........................
TROUBLESHOOTING 3........
TROUBLESHOOTING 3.........
ON-VEHICLE SERVICE 24...................
Magnetic Clutch Test 24.........................
Idle Up Operation Check 25.............
FRONT A/C 25..............................
Automatic A/C Control Panel Assembly
(A/C-ECU) 25..................................Blower Linear Controller 26......................
Air Mix Damper Motor and
Air Outlet Changeover Damper Motor 27..........
Heater Water Temperature Sensor 29.............
PHOTO SENSOR 30........................
OUTSIDE AIR TEMPERATURE SENSOR 30..
REAR A/C 30...............................
Electric Motor for Air Outlet Changeover
Damper 30....................................
REFRIGERANT LINE 31.....................
COMPRESSOR 33...........................


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HEATER, AIR CONDITIONER AND VENTILATION -Service Specifications/Lubricants55B-2
SERVICE SPECIFICATIONS
ItemStandard value
Resistance value of the potentiometer for the air mix damper (front A/C) kWApprox. 0.96 - 5.76
Resistance value of the potentiometer for the air outlet changeover damper (front A/C)
kWApprox. 0.96 - 5.76
Resistance of the rear air conditioner switch (temperature control switch) heater (floor console)> kW0-3
Resistance of the potentiometer for the air mix damper kW1.2 - 4.8
Resistance value of the resistor (rear A/C)Between terminals 1 and 64.9±7%
WBetween terminals 1 and 31.25±7%
Air compressor air gap mm0.35 - 0.65
Idle speed r/min (N or P range)Petrol600±50
Idle-up speed r/min (N or P range)PetrolWhen the A/C is under
low load700±50
When the A/C is under
medium load800±50
When the A/C is under
high load1,000±50
LUBRICANTS
ItemBrandQuantity
Compressor oil mlSingle A/C cooler>DENSO OIL 8120±20
Single air conditioner rear cooler>, dual air conditionerDENSO OIL 8140±20
Pipe connectionsDENSO OIL 8As required
Refrigerant gSingle A/C cooler>R134a (HFC-134a)500±20
Single air conditioner rear cooler>, dual air conditionerR134a (HFC-134a)780±20


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S
PEC IA L TO OLS
T o ols N
o. N
am e A
pplic a tio n M
B991502 M
UT-II su b as-
s e m bly F
ro nt A /C ch eck M
B991529 D
ia gnosis co de
c h eckin g harn ess C
heck of th e fu ll- a uto m atic air co ndit io ner by
u sin g avo lt m ete r B
C
D H
arn ess se t
A : Check harn ess
B : LE D harn ess
C : LE D harn ess
a dapte r
D : Pro be C
ontin uit y ch eck and vo lt a ge measu re m enta t
h arn esse s or co nnecto r
A : For ch eckin g co nnecto r pin co nta ct
p re ssu re
B : For ch eckin g th e pow er su pply cir c u it
C : For ch eckin g th e pow er su pply cir c u it
D : For co nnectin g co m merc ia l te ste r

HEATER, AIR CONDITIONER AND VENTILATION -Troubleshooting 55B-4
INSPECTION CHART FOR DIAGNOSIS CODES
Code No.Diagnosis itemReference
page
11Inside air temperature sensor system (open circuit)55B-4
12Inside air temperature sensor system (short circuit)55B-4
13Outside air temperature sensor system (open circuit)55B-4
14Outside air temperature sensor system (short circuit)55B-4
15Heater water temperature sensor system (open circuit)55B-5
16Heater water temperature sensor system (short circuit)55B-5
21Air thermo sensor system (open circuit)55B-5
22Air thermo sensor system (short circuit)55B-5
31Potentiometer system for the air mix damper55B-6
32Potentiometer system for the air outlet changeover damper55B-7
INSPECTION PROCEDURE FOR DIAGNOSIS CODES
Code No.11, 12 Inside air temperature sensor systemProbable cause
Code No.11 is set when the inside air temperature circuit inside the A/C-ECU is
open. Meanwhile, code No.12 is set when it is short.Malfunction of the A/C-ECU
Replace the automatic A/C control panelassembly (A/C-ECU).
Code No.13, 14 Outside air temperature sensor systemProbable cause
Code No.13 is set when the outside air temperature sensor circuit is open.
Meanwhile, code No.14 is set when it is short.DMalfunction of the outside air temperature sensor
DMalfunction of connector or harness
DMalfunction of the A/C-ECU
OK
Replace the automatic A/C control panelassembly (A/C-ECU).
NG
Check the harness wire between the outside air temperature
sensor and the A/C-ECU.NG
Repair
OK
Check the trouble symptoms.
OK
Check the following connectors:A-30, D-27, D-132NG
Repair
Check the outside air temperature sensor (Refer to P.55B-30).NG
Replace


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HEATER, AIR CONDITIONER AND VENTILATION -Troubleshooting 55B-5
Code No.15, 16 Heater water temperature sensor
systemProbable cause
Code No.15 is output when the heater water temperature sensor circuit is open.
Code No.16 is output when that circuit is short.DMalfunction of the heater water temperature sensor
DMalfunction of connector or harness
DMalfunction of the A/C-ECU
OK
Replace the automatic A/C control panelassembly (A/C-ECU).
NG
Check the harness wire between the heater water temperature
sensor and the A/C-ECU.NG
Repair
OK
Check the trouble symptoms.
OK
Check the following connectors:D-19, D-132NG
Repair
Check the heater water temperature sensor
(Refer to P.55B-29).NG
Replace
Code No.21, 22 Air thermo sensor systemProbable cause
Code No.21 is set when the air thermo sensor circuit is open. Meanwhile, code
No.22 is set when it is short.DMalfunction of the air thermo sensor
DMalfunction of connector or harness
DMalfunction of the A/C-ECU
OK
Replace the automatic A/C control panelassembly (A/C-ECU).
NG
Check the harness wire between the air thermo sensor and
the A/C-ECU.NG
Repair
OK
Check the trouble symptoms.
OK
Check the following connectors:D-129, D-132NG
Repair
Check the air thermo sensor
(Refer to GROUP 55A - Front A/C).NG
Replace


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