Mitsubishi Galant 9G. Manual — part 281
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-200
(4) Measure the voltage between A/C-ECU connector C-15
terminal No.10 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-15 (terminal 10).
AC209365HI
CONNECTOR C-15
(HARNESS SIDE)
AC305977AJ
CONNECTOR: B-18X
RELAY BOX SIDE
FRONT OF
VEHICLE
JUNCTION BLOCK
TRIANGLE MARK
AC305234
C-15 (B)
C-23
C-15
HARNESS SIDE
C-23
AP
CONNECTORS: C-15, C-23
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-201
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-15 (terminal 10) 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.
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.
AC305210
A-13 (GR)
AR
CONNECTOR: A-13
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
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-202
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.
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.
AC206292AB
A/C COMPRESSOR
CLUTCH
CONNECTOR
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)
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-203
STEP 22. Check the A/C pressure sensor operation.
(1) Assemble a gauge manifold on the high pressure service
valve.
(2) Disconnect the A/C pressure sensor connector and connect
special tool test harness MB991658 as shown in the
illustration.
(3) Turn ON the engine and then turn ON the air conditioner
switch.
(4) At this time, check to see that the voltage of A/C pressure
sensor terminal No. 2 reflects the specifications of the
figure.
NOTE: The allowance shall be defined as
±
5%.
Q: Is the A/C pressure sensor operating properly?
YES : Go to Step 23.
NO : Replace the A/C pressure sensor. Check that the air
conditioning works normally.
STEP 23. Check the refrigerant level.
Use the refrigerant recovery station to remove all of the refrig-
erant, and then calculate the amount of the refrigerant and
charge it.
Q: Is the refrigerant level correct?
YES : Go to Step 24.
NO : Correct the refrigerant level (Refer to On-vehicle
Service
). Check that the air conditioning
works normally.
STEP 24. Replace the A/C-ECU.
Q: Does the A/C operate normally?
YES : The procedure is complete.
NO : Replace the powertrain control module. Check that
the air conditioning works normally.
AC305034
A/C PRESSURE SENSOR
AD
AC307368
A/C
PRESSURE
SENSOR
SIDE
MB991658
AB
HARNESS SIDE
AC208297AB
REFRIGERANT PRESSURE (MPa)
OUTPUT VOLTAGE
(V)
0
1
2
3
5
4
1
2
3
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