Mitsubishi Stealth 1994 Import Service Manual page 1201

HEATERS AND MANUAL AIR CONDITIONING - Troubleshooting
TROUBLESHOOTING QUICK-REFERENCE TABLE
Compressor doesn't operate.
Item Inspection
no. point
Magnetic clutch Apply battery voltage to
2 Blower switch Check for continuity between Continuity
switch terminals.
(Refer to P.24-21.)
3 A i r conditio- Check for continuity between Continuity
ning switch switch terminals,
(Refer to P.24.23.)
4 Magnetic clutch Check for continuity between Continuity
relay terminals @and @
With battery voltage applied
betweem terminals @and 0,
check for continuity between
terminals @ and @
5 Liquid pipe Connect adapter valve and
gauge manifold to service
plug to measure high pres-
sure side refrigerant
pressure.
6 Dual-pressure
Check for continuity between Continuity
switch
switch terminals.
7 Thermostat
Check for continuity between Continuity
thermostat terminals.
I
8
Measure resistance across
sensor terminals at a sensin
temperature of 25°C 77°F)
9 Air inlet Measure resistance across
sensor
terminals at a sensing
temperature of 25°C (77°F)
If no abnormality is noted at each inspection point after inspection coducted 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 control unit,
Interior temperature does not lower
(No cold air coming out)
Probable cause
Excessive refrigerant
Clogged receiver
Clogged expansion valve
Defective compressor
Method
Within range of
384 psi)
Within range of
3.9 to 4.1 k0
Within range of
0.9 to 1 .I kfi
Criteria
Probable cause
Abnormal
No sound is
Faulty magnetic clutch
noted
No continuity
Faulty air magnetic clutch
relay
Outside range of Gas leakage
(299 to 384 psi)
No continuity Faulty dual-pressure switch
Outside range of
Faulty air inlet sensor
0.9 to 1.1 k0
Remedy
Discharge refrigerant
Replace receiver
Replace expansion valve
Replace compressor
24-9
Remedy
Replace magnetic clutch.
Replace magnetic clutch
relay.
Replace dual-pressure
switch.
Replace air inlet sensor.
Ref. page
24-38
24-28
24-29