Mitsubishi Galant (2004+). Manual — part 767
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-207
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 illustra-
tion.
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 fig-
ure.
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
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-208
INSPECTION PROCEDURE 5: Front Blower Fan and Motor do not Turn.
IGNITION
SWITCH (IG2)
FUSIBLE
LINK
1
JUNCTION
BLOCK
BLOWER
RELAY
FRONT
BLOWER
MOTOR
POWER
TRANSISTOR
A/C-ECU
Blower Motor Circuit
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-209
.
CIRCUIT OPERATION
If the blower motor does not operate, the blower
relay system is suspected.
.
TROUBLESHOOTING HINTS
• Malfunction of the front blower relay
• Malfunction of the power transistor
• Malfunction of the front blower motor
• Malfunction of the A/C-ECU
• Damaged harness wires or connectors
DIAGNOSIS
Required Special Tool:
• MB991223: Test Harness Set
AC305015AH
FUSIBLE LINK (1)
FUSIBLE LINKS
NO.1
AC305233BP
CONNECTORS: C-14, C-115
C-14
C-115
AC305231
CONNECTOR: C-29
AH
AC305415BD
CONNECTORS: C-202, C-211, C-215, C-216
JUNCTION BLOCK
(FRONT VIEW)
C-216 (B)
C-215
C-202
C-211
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-210
STEP 1. Check blower motor connector C-115 and
A/C-ECU connector C-15 for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Q: Are blower motor connector C-115 and A/C-ECU
connector C-15 in good condition?
YES : Go to Step 2.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
.The
blower motor should operate normally.
AC305234
CONNECTORS: C-15, C-115
HARNESS SIDE
C-15
C-115
HARNESS SIDE
C-115
C-15 (B)
AQ
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