2000 MITSUBISHI MONTERO sensor
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55A-2
HEATER, AIR
CONDITIONER AND
VENTILATION
CONTENTS
SERVICE SPECIFICATIONS 3.................
LUBRICANTS 3..............................
TROUBLESHOOTING
TROUBLESHOOTING
ON-VEHICLE SERVICE 9.....................
Refrigerant Level Test through Performance Test 9.
Magnetic Clutch Test 10.........................
Receiver Drier Test 10..........................
Compressor Drive Belt Adjustment 10.............
Dual Pressure Switch Check 10..................
Charging 11...................................
Performance Test 15............................
Front Blower Relay and Rear Blower Relay
Continuity Check 18............................
Continuity Check of A/C Compressor Relay and
Condernser Fan Relay 18.......................
PTC Heater Relay Continuity Check 19...........
Idle-up Operation Check
Vacuum Actuator Check
Idle-up Solenoid Valve Check 21.................
Clean Air Filter Replacement Procedure 22........
FRONT A/C 23..............................
Air Conditioner Control Panel Assembly and
A/C Switch 23.................................
Heater Unit and Blower Assembly 26.............
Blower Motor and Resistor 29....................
Inside/Outside Air Changeover Damper Motor 30...
Automatic Compressor-ECU and
Air Thermo Sensor Assembly 31.................
REAR HEATER AND REAR COOLER 32.....
Rear A/C Switch, Front Rear Fan Switch 32.......
Rear A/C Control Unit 34........................
Rear Heater Unit 34............................
Rear Heater Unit and Rear Blower Assembly 37....
HEAT SWITCH 40...........................
COMPRESSOR 41...........................
CONDENSER ASSEMBLY AND
CONDENSER FAN 45........................
REFRIGERANT LINE 47.....................
ENGINE COOLANT TEMPERATURE SWITCH
51 ..........................................
IDLE-UP SYSTEM 53........................
DUCTS 54..................................
VENTILATION 56............................
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Page 1750 of 1839
HEATER, AIR CONDITIONER AND VENTILATION - Troubleshooting55A-4
TROUBLESHOOTING
Trouble symp-
tomProbable causeRemedyRefer-
ence
page
The air condi-Malfunction of fuseReplace the fuse.–
tioner does notMalfunction of harness or connectorRepair the harness or connector.–work.
Refrigerant leak or overfilling of refrigerantReplenish the refrigerant, repair the leak
or take out some of the refrigerant.–
A/C compressor relay is defective.Replace the A/C compressor relay.55A-18
The A/C compressor magnetic clutch is
defective.Replace the A/C compressor.55A-10
The dual pressure switch is defective.Replace the dual-pressure switch.55A-10
The A/C switch is defective.Replace the heater control assembly.55A-24
The blower switch is defective.Replace the heater control assembly.55A-24
The air thermo sensor is defective.Replace the automatic compressor-ECU
and the air thermo sensor assembly.55A-31
The automatic compressor-ECU is defec-
tive.Replace the automatic compressor-ECU
and the air thermo sensor assembly.55A-6
The engine-ECU is defective.Replace the engine-ECU.–
When the A/C
is operating,Refrigerant leakReplenish the refrigerant and repair the
leak.–
temperature
inside the pas-The dual pressure switch is defective.Replace the dual-pressure switch.55A-10inside the pas-
senger
The condenser fan relay is defective.Replace the condenser fan relay.55A-18compartment
doesn’t de-
A/C compressor relay is defective.Replace the A/C compressor relay.55A-18
crease (cool
air is not
emitted).The A/C compressor magnetic clutch is
defective.Replace the A/C compressor.55A-10
When the A/C
is operating,
temperature
inside the pas-
senger
compartment
doesn’t in-
crease (warm
air is not
emitted).Malfunction of the air thermo sensorReplace the automatic compressor-ECU
and the air thermo sensor assembly.55A-31
The blowerMalfunction of fuseReplace the fuse.–
motor does notMalfunction of harness or connectorRepair the harness or connector.–run.
The blower relay is defective.Replace the blower relay.55A-18
The blower motor is defective.Replace the blower motor.55A-29
The blower switch is defective.Replace the heater control assembly.55A-24
Malfunction of the resistorReplace the resistor.55A-29
The automatic compressor-ECU is defec-
tive.Replace the automatic compressor-ECU
and the air thermo sensor assembly.55A-6
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Page 1753 of 1839
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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Page 1804 of 1839
55B-1
HEATER, AIR
CONDITIONER AND
VENTILATION
CONTENTS
SERVICE SPECIFICATIONS 2.................
LUBRICANTS 2..............................
SPECIAL TOOLS 3...........................
TROUBLESHOOTING
TROUBLESHOOTING
ON-VEHICLE SERVICE 24...................
Magnetic Clutch Test 24.........................
Idle Up Operation Check
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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Page 1807 of 1839
HEATER, AIR CONDITIONER AND VENTILATION -Troubleshooting
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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Page 1808 of 1839
HEATER, AIR CONDITIONER AND VENTILATION -Troubleshooting
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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Page 1813 of 1839
HEATER, AIR CONDITIONER AND VENTILATION -Troubleshooting
Inspection procedure 4
A/C outlet air temperature can not be set.
Probable cause
If the air outlet temperature can not be changed after a A/C temperature is set,
sensor(s) or the air mix damper may be defective.DMalfunction of the inside air temperature sensor
DMalfunction of the outside air temperature sensor
DMalfunction of the heater water temperature sensor
DMalfunction of the photo sensor
DMalfunction of the electric motor for the air mix
damper
DMalfunction of harness or connector
DMalfunction of the A/C-ECU
NG
Repair
NG
Repair
OK
Replace the automatic A/C control panelassembly (A/C-ECU).
OK
MUT-
IIData list
31 Potentiometer for air mix damperNGCheck the air mix damper potentiometer system
(Refer to P.55B-6, Code No.31).
NG
Check the harness wire between the photo sensor and the
A/C-ECU.
OK
Check the trouble
symptoms.
OK
Check the following connectors:D-132, D-106
OK
MUT-
IIData list
25 Photo sensorNGCheck the photo sensor (Automatic air conditioner).
(Refer to P.55B-30.)
OK
MUT-
IIData list
15 Heater water temperature sensorNGCheck the heater water temperature sensor system.
(Refer to P.55B-5, Code Nos.15, 16.)
OK
MUT-
IIData list
13 Outside air temperature sensorNGCheck the outside air temperature sensor system.
(Refer to P.55B-4, Code Nos.13, 14.)
NO
MUT-
IIData list
11 Inside air temperature sensorNGReplace the automatic A/C control panelassembly (A/C-ECU).
MUT-
IISelf-Diag Code
Are diagnosis codes displayed?YESInspection chart for diagnosis codes (Refer to P.55B-4.)
NG
Repair OKReplace the automatic A/C control panel
assembly (A/C-ECU).
NG
Check the harness wire between the air mix damper motor
and the A/C-ECU.NG
Repair
OK
Check the trouble symptoms.
OK
Check the following connectors:D-130, D-131NG
Repair
Check the air mix damper motor (Refer to P.55B-27).NG
Replace OK
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Page 1819 of 1839
HEATER, AIR CONDITIONER AND VENTILATION -Troubleshooting
Inspection procedure 11
The condenser fan does not operate <4D56>.
Probable cause
If the condenser fan does not operate, the condenser fan relay or motor may be
defective.DMalfunction of the condenser fan relay
DMalfunction of harness or connector
DMalfunction of the engine-A/T-ECU
engine-ECU
NG
Check the harness wire between the condenser fan relay and
the ignition switch (IG2), and repair if necessary.
NG
Repair
NG
Check the harness wire between the condenser fan motor and
body earth, and repair if necessary.
NG
Repair
NG
Repair
OK
NG
Check the harness wire between the condenser fan relay and
fusible link (1), and repair if necessary.
NG
Repair
NG
Check the harness wires between the condenser fan relay
and the condenser fan motor and between the condenser fan
relay and theengine coolant temperaturesensor, and repair if
necessary.
OK
Check the trouble symptoms.
OK
Check the following connectors:A-10X, A-27, A-04
OK
Check the trouble symptoms.
OK
Measure at condenser fan motor connector A-27.
DDisconnect the connector and measure at the harness
side.
DContinuity between terminal 2 and body earth
OK:ContinuityNGCheck the following connector:A-27
OK
Check the trouble symptoms.
Check the following connector:A-10X
(2) NG
OK
Check the trouble symptoms.
OK
Measure at condenser fan relay connector A-10X.
DDisconnect the connector, and measure at the J/B side.
DIgnition switch: ON
(1) Voltage between terminal 3 and body earth
OK:System voltage
(2) Voltage between terminal 5 and body earth
OK:System voltage(1) NGCheck the following connectors:A-10X, A-15, D-27, D-210,
D-208
OK
Check the condenser fan motor
(Refer to GROUP 55A - Condenser Fan).NG
Replace
Check the condenser fan relay
(Refer to GROUP 55A - On-vehicle Service).NG
Replace
NG
ReplaceReplace the engine coolant temperaturesensor.
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