1991 MITSUBISHI 3000GT Service Manual

FULL AUTO AIR CONDITIONER - Troubleshootina55-55
DIAGNOSISDISPLAY PAlTERNS AND CODES
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L
ii
CodeDisplay pattern (output codes)CauseFail safe(use with voltmeter)
0Normal
ON
OFFContinuous
I1 n
Open-circuited room-temperature sensorCondition in which 25°C
(77°F) is detected
I2 n
Short-circuited room-temperature sensor
I3 n
Open-circuited outside-air sensorCondition in which 20°C
(68°F) is detected
I4 n
Short-circuited outside-air sensor
12A0104
21 -,llJlL
Open-circuited air therm0 sensorCondition in which -2°C(-35.6”F) is detected
22 nn
Short-circuited air therm0 sensor
31 J-[-u1 1Short-circuited and open-circuitedair mix damper potentiometerMAX. HOT(or MAX. COOL when itis at MAX. COOL)
32 nnn
Short-circuited and open-circuitedDEF.mode selector damper potentiometer(or FACE when it isat FACE)
12A0107
41, nnnn
Defective air mix damper motor
42Defective mode selector damper motor
1uuuI nn12A0105
NOTE:(1) If two or more abnormal conditions occur at the same time, the code numbers are alternately displayed, in
order, repeatedly.
(2) The nature of the malfunction is entered and stored in the memory from the time the malfunction occurs until
the ignition switch is next turned to OFF.TSB Revision

55-56FULL AUTO AIR CONDITIONERSafety Precautions I Service Adjustment Procedures I- Air Conditioner Control Panel, Air Condiiioner Control Unit
SAFETY PRECAUTIONSSame as those given in HEATERS AND MANUAL AIR CONDITIONER. (Refer to
P.55-9.)
SERVICE ADJUSTMENT PROCEDURESSame as those given in HEATERS AND MANUAL AIR CONDITIONER. (Refer to
P.55-10.)
M55FEAVI
AIR CONDITIONER CONTROL PANEL, AIR CONDITIONER CONTROL
UNIT
REMOVAL AND INSTALLATIONhl!XGA-E
2OFOO69Removal steps
*I)1. Center air outlet assembly
2. Air conditioner control panel
3. Air conditioner control unit
SERVICE POINT OF REMOVALMWSGBAMZ1.
.REMOVAL OF CENTER AIR OUTLET ASSEMBLY
Disengaging the clips (2 positions) of the center air outlet
assembly with a flat tip screwdriver, remove the center
airoutlet assembly with a plastic trim stick.
I
ij!

FULL AUTO AIR CONDITIONER -Power Transistor, Belt Lock Controller55-57
POWER TRANSISTOR, BELT LOCK CONTROLLER
REMOVAL AND INSTALLATION
J?nPower transistor removal steps
1. Stopper
2. Glove box outer case assembly
3. Power transistor
2OFOO73Belt lock controller removal steps
M55LA- -
4. Under cover
5. Belt lock controller
1 TSB RevisionI

55-58FULL AUTO AIR CONDITIONER - Damper Control Motor As=W
DAMPER CONTROL MOTOR ASSEMBLY
REMOVAL AND INSTALLATIONM55VA- -
6
\
2OFOO77Inside/outside-air selector damper motor assembly
removal steps
8. Air conditioner control unit
9. Air mix damper motor assembly
1. Stopper
2. Glove box outer case
3. Inside/outside-air selector damper motor’assemblyOutlet selector damper motor assembly removal
steps
IO. Knee protector11. Side console coverAir mix damper motor assembly‘removal steps
w *a4. Floor console (Refer to GROUP 52A- Floor
Console.)5. Air conditioner control unita*6. Center outlet assembly
7. Air conditioner control panel
12. Shower duct and lap cooler duct13. Outlet selector damper motor assembly
IIdriver, ,/ 20;003--t
1 TSB Revision
SERVICE POINTS OF REMOVALM55vaAA6. REMOVAL OF CENTER AIR OUTLET ASSEMBLY
Disengaging the clips (2 positions) of the center air outlet
assembly with a flat tip screwdriver, remove the center airoutlet assembly with a plastic trim tool.
1

FULL AUTO AIR CONDITIONER -Damper Control Motor Assembly55-59
II
INSPECTIONINSPECTION OF INSIDE/OUTSIDE-AIR DAMPER MOTOR
ASSEMBLY
Check that the motor rotates when battery voltage is applied tothe connector on the motor assembly side.
Check also that the motor rotates in the backward direction
when polarity is changed.
Caution1. Cut off the voltage when the damper is in the RECIR-
CULATION or FRESH position.2. Cut off the voltage if the motor does not turn when
battery voltage is applied.
INSPECTION OF AIR MIX DAMPER MOTOR
Check that the motor rotates when battery voltage is applied
across terminals
@ and @ of motor assembly side connector.
Check also that the motor turns in the backward direction when
polarity is changed.
Caution1. Cut off the voltage when the damper is in the MAX.
HOT or MAX. COOL position.
2. Cut off the voltage if the motor does not turn when
battery voltage is applied.
INSPECTION OF AIR MIX DAMPER POTENTIOMETER
Connect a circuit tester across terminals @ and @of the motorassembly connector and check that resistance gradually
changes as the damper is moved from MAX. HOT to MAX.
COOL position.
Standard valueMAX. HOT: Approx. 0.2
klRMAX. COOL: Approx. 4.9
kR
INSPECTION OF OUTLET SELECTOR DAMPER MOTORCheck that the motor turns when battery voltage is applied
across terminals @ and @ of the motor assembly connector.
Check also that the motor turns in the backward direction when
polarity is changed.
Caution
1.Cut off the voltage when the damper is in the DEF. or
FACE position.2. Cut off the voltage if the motor does not turn when
battery voltage is applied.
INSPECTION OF OUTLET SELECTOR DAMPER POTENTIO-
METER
Connect a circuit tester across terminals @and @of the motorassembly connector and check that resistance gradually
changes as the damper is moved from DEF. to FACE position.
Standard valueDEF. position: Approx. 2.0
kRFACE position: Approx. 4.3 kfl
TSB Revision

55-60
SENSORSFULL AUTO AIR CONDITIONER
- Sensors
REMOVAL AND INSTALLATIONM550A- _
4*1. Passenger compartment temperature sen-sor2OFOO63
Outside air sensor removal steps
2. Stopper
3. Glove box outer case
4. Photo sensor connector connection
5. Photo sensorWater temperature sensor removal steps
2. StopperI3: F/it; box outer case assembly
7. Water temperature sensorOutside-air-temperature sensor removal steps
2. Stopper
3. Glove box outer case assembly
8. Outside-air-temperature sensor
82OFOO75
-
Passenger compartment
temperature sensor
SERVICE POINTS OF REMOVALM5506AE
1. REMOVAL OF PASSENGER COMPARTMENT TEMPER-
ATURE SENSOR
2OPO164LlTSB Revision
Using the trim stick, remove the passenger compartmenttemperature sensor from the headlining.
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FULL AUTO AIR CONDITIONER - Sensors55-615. REMOVAL OF PHOTO SENSOR
Using a trim stick, remove the photo sensor from the
defroster garnishes.
Thermometer
2OAO19:
c
3
INSPECTIONM55OcALl
WATER TEMPERATURE SENSOR
(1) Dip the water-temperature sensor in hot water and, using astove, etc., raise the water temperature.
(2) Check that the water-temperature sensor is conductive
when the water temperature reaches the specified temper-
ature.Standard value: 26.5 + 4°C (79.7
+ 7.2”Fl
OUTSIDE-AIR-TEMPERATURE SENSOR
The condition can be considered normal if the resistances are
measured within the ranges of 3.98
- 4.12 kilohms and 2.21 -
2.35 kilohms, respectively, when the outside-air-temperature
sensor is submerged in warm water of 25°C (77°F) and 40°C(104°F) for one minute or longer each.
NOTE
The relationship between the outside-air-temperature and theresistance values is as shown below.
&$$nt temperatureI-10 /0110 / i01 25/ 301 40 /(14) (32) (50) (68) (77) (86) (104)
Resistance value(reference) k0
1 TSB Revision

55-62FULL AUTO AIR CONDITIONER
ICompressor. Condenser, Condenser Fan Motor, Refrigerant
- Line and Engine Coolant Temperature Switch / Other Parts
COMPRESSOR, CONDENSER, CONDENSER FAN MOTOR, RE-
FRIGERANT LINE AND ENGINE COOLANT TEMPERATURE SWITCH
M55TA-B4
The service procedures are the same as those for manual
air conditioner except for those parts described below on
turbocharged vehicles.5
Compressor, condenser and condenser fanmotor, refrigerant line removal steps
l *I. Air hose Bl +2. Air pipe
ii
Engine coolant temperature switch
removal steps
NOTETorque hose clamps to 4 Nm (2.9 ftlbs.).3. Air hose Al *4. Air intake hose A*a5. Air intake hose B
L
Air intake hose B
OSFOO23
Align7ment marks
Hose end: Paint mar
Pipe end:
Protrusron
OTHER PARTS
SERVICE POINTS OF INSTALLATIONM55iDAF
5.INSTALLATION OF AIR INTAKE HOSE B / 4. AIR INTAKE
HOSE AAlign the cutouts in air intake hose A indicated by arrows
with the n markings on air intake hoses B and C and inserthoses B and C all the way into hose A.
Insert the other end of air intake hose B all the way into
turbocharger side.2. INSTALLATION OF AIR PIPE
/ 1. AIR HOSE B
When installing the air hoses, make sure that the alignment
marks at places indicated by arrows are properly aligned.Insert each air hose until it hits the root of step or it
bottoms.
CautionBe careful not to allow any foreign matter to get into
the hoses, pipes, or the intercooler itself.M55WA-
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Service procedures for other parts are the same as those in HEATERS AND MANUAL AIR CONDITIONER.
Part name
Ref. page
Heater Unit
P.55-22
Blower Motor AssemblyP.55-23
Evaporator - Removal and InstallationP.55-25Part name
Evaporator - Disassembly and Reassembly
Compressor
- Disassembly and Reassembly
VentilatorsRef. page
P.55-26
P.55-29
1 TSB RevisionHY009015-1132