Mitsubishi Galant 9G. Manual — part 264
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-132
(4) Measure the voltage between A/C-ECU connector C-09
terminal No.23 and ground.
• The measured value should be approximately 12 volts
(battery positive voltage).
Q: Does the measured voltage correspond with this range?
YES : Go to Step 18.
NO : Go to Step 17.
STEP 17. Check the wiring harness between A/C
compressor clutch relay connector B-18X (terminal 4) and
A/C-ECU connector C-09 (terminal 23).
AC209365
21
22
23
24
25
26
27
28
29
30
31
32
CONNECTOR C-09
(HARNESS SIDE)
GV
AC305977AJ
CONNECTOR: B-18X
RELAY BOX SIDE
FRONT OF
VEHICLE
JUNCTION BLOCK
TRIANGLE MARK
AC305233
C-09 (B)
HARNESS SIDE
21
22
23
24
25
26
27
28
29
30
31
32
BB
CONNECTOR: C-09
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-133
NOTE: Also check intermediate connectors A-13 and C-23 for
loose, corroded, or damaged terminals, or terminals pushed
back in the connector. If intermediate connector A-13 or C-23 is
damaged, repair or replace the connector as described in
GROUP 00E, Harness Connector Inspection
Q: Is the wiring harness between A/C compressor clutch
relay connector B-18X (terminal 4) and A/C-ECU
connector C-09 (terminal 23) in good condition?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunctions
.
NO : Repair the wiring harness. Check that the air
conditioning works normally.
AC305210
A-13 (GR)
AR
CONNECTOR: A-13
AC305233BL
CONNECTOR: C-23
8
3
1
4 5 6
2
7
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-134
STEP 18. Check the refrigerant temperature switch.
CAUTION
Do not heat more than necessary.
(1) Dip the metal part of the cooling temperature switch into
engine oil and increase the oil temperature using a gas
burner or similar.
(2) When the oil temperature reaches the standard value,
check that voltage is supplied between the terminals.
Standard value:
NOTE: When the oil temperature is 155
°
C (311
°
F) or more
and there is no continuity, the resistance will not be 2
Ω
or
lower until the oil temperature reduces to 125
°
C (257
°
F) or
less.
Q: Is the refrigerant temperature switch operating
properly?
YES : Go to Step 19.
NO : Replace the refrigerant temperature switch. Check
that the air conditioning works normally.
STEP 19. Check the air conditioning compressor clutch
operation.
Connect the compressor connector terminal to the battery posi-
tive (+) terminal and ground the battery’s negative (-) terminal
to the compressor unit. At that time, the air conditioning com-
pressor clutch should make a definite operating sound.
Q: Can the sound (click) of the air conditioning
compressor clutch operation be heard?
YES : Go to Step 20.
NO : Replace the compressor magnet clutch. Check that
the air conditioning works normally.
ITEM
TEMPERATURE
Less than 2 ohms Slightly below 155
°C (311°F)
No continuity
155
°C (311°F) or more
AC100787
THERMOMETER
ENGINE OIL
AB
AC100810
LESS THAN 2
Ω
NO CONTINUITY
125˚C
(257˚F)
155˚C
(311˚F)
OIL TEMPRATURE
AE
AC206292AB
A/C COMPRESSOR
CLUTCH
CONNECTOR
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-135
STEP 20. Check the air thermo sensor.
Measure the resistance between connector terminals 1 and 2
under at least two different temperatures. The resistance val-
ues should generally match those in the graph.
NOTE: The temperature at the check should not exceed the
range in the graph.
Q: Is the air thermo sensor in good condition?
YES : Go to Step 21.
NO : Replace the air thermo sensor. Check that the air
conditioning works normally.
STEP 21. Check the ambient air temperature sensor.
Measure the resistance between the sensor terminals under at
least two temperatures. The resistance values should meet the
values shown.
NOTE: The temperature should be within the shown range.
Q: Is the ambient air temperature sensor in good
condition?
YES : Go to Step 22.
NO : Replace the ambient air temperature sensor. Check
that the air conditioning works normally.
AC001043
RESISTANCE k
Ω
8
6
4
2
0
-10
0
10
20
30
40
TEMPERATURE ˚C(˚F)
AB
(14)
(32)
(50)
(86)
(104)
(68)
AC209942AB
REGISTANCE
k
Ω
10
20
30
40
0
0
20
(32) (68)
TEMPERATURE ˚C (˚F)
40
(104)
60
(140)
-20
(-4)
-30
(-22)
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