Mitsubishi 3000GT Service Manual page 1233

TROUBLESHOOTING QUICK-REFERENCE TABLE
Compressor doesn't operate.
Inspection
no. point
Magnetic Apply battery voltage to
clutch
magnetic clutch terminal
(1) to check if sound is de-
veloped during operation.
Blower switch Check for continuity be-
tween switch terminals.
(Refer to P 55-29.)
3 Air condition-
Check for continuity be-
ing switch
tween switch terminals.
(Refer to P 55-31.)
Magnetic Check for continuity be-
clutch relay
tween terminals (2) and (4)
With battery voltage ap-
plied between terminals (2)
and (4) check for continu-
ity between terminals (1)
and (3)
5 Liquid pipe
Connect adapter valve and
gauge manifold to service
plug to measure high pres-
sure side refrigerant pres-
sure.
6 Dual-pres-
Check for continuity be-
sure switch
tween switch terminals.
7
Thermostat Check for continuity be-
tween thermostat termi-
nals. (Refer to P.5541.)
3
Measure resistance across
sensor terminals at a sensing tem-
perature of 25°C (77°F)
Air inlet sen-
Measure resistance across
sor
terminals at a sensing tem-
perature of 25°C (77°F)
If no abnormality is noted at each inspection point after inspection conducted in the sequence shown in this quick-reference table it is suspected
that the compressor is inoperative because of faulty air conditioning control unit. Therefore, replace the air conditioning controi unit.
Interior temperature does not lower
(No cold air coming out)
Probable cause
Excessive refrigerant
Clogged receiver
Clogged expansion valve
Defective compressor
HEATERS AND MANUAL
AIR CONDITIONING
Method
Sound is noted
Continuity
Continuity
Continuity
Within range of 2,100 to 2,700
Continuity
Continuity
Within range of 3.9 to 4.1 kC
Within range of 0.9 to 1 .l kQ
Discharge refrigerant.
Replace receiver.
Replace expansion valve.
Replace compressor.
TSB Revision
Probable cause
Faulty magnetic clutch
Replace magnetic
clutch.
Faulty blower switch
Faulty air conditioning Replace air conditioning
switch
switch.
Faulty air magnetic clutch Replace magnetic
relay
clutch relay.
Gas leakage
Correct places where
gas leaks.
Faulty dual-pressure Replace dual-pressure
switch
switch.
Faulty thermostat Replace thermostat.
Faulty fin-therm0 sensor
Replace fin-therm0 sen-
sor.
Faulty air inlet sensor
Replace air inlet sensor.
R e m e d y
5543
Remedy
Ref. page
55-48
55-39