Mitsubishi Galant (2004+). Manual — part 750
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-139
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 : No action is necessary and testing 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-140
INSPECTION PROCEDURE 5: Blower Fan and Motor do not Turn.
IGNITION
SWITCH (IG2)
1
FUSIBLE
LINK
BLOWER
SWITCH
BLOWER
MOTOR
BLOWER
RELAY
JUNCTION
BLOCK
JOINT CONNECTOR (2)
Blower Motor Circuit
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-141
.
CIRCUIT OPERATION
If the blower motor does not operate, the blower
relay system is suspected.
.
TROUBLESHOOTING HINTS
• Malfunction of the blower relay
• Malfunction of the resistor
• Malfunction of the blower motor
• Malfunction of the A/C-ECU
• Damaged harness wires or connectors
DIAGNOSIS
Required Special Tool:
• MB991223: Test Harness Set
STEP 1. Check blower motor connector C-115 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is blower motor connector C-115 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.
AC305231
C-29
C-03
CONNECTORS: C-03, C-29
BK
AC305233BP
CONNECTORS: C-14, C-115
C-14
C-115
AC305415BD
CONNECTORS: C-202, C-211, C-215, C-216
JUNCTION BLOCK
(FRONT VIEW)
C-216 (B)
C-215
C-202
C-211
AC305233BN
CONNECTOR: C-115
HARNESS SIDE
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-142
STEP 2. Measure the voltage at blower motor connector
C-115.
(1) Disconnect blower motor connector C-115, and measure
the voltage at the wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Turn the blower switch to the "4 (HI)" position.
(4) Measure the voltage between terminal 1 and ground.
• The measured value should be approx. 12 volts (battery
positive voltage).
Q: Is the measured voltage approx. 12 volts?
YES : Go to Step 15.
NO : Go to Step 3.
STEP 3. Check blower relay connector C-202 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is blower relay connector C-202 in good condition?
YES : Go to Step 4.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
.The
blower motor should operate normally.
AC305233BN
CONNECTOR: C-115
HARNESS SIDE
AC209365
CONNECTOR C-115
(HARNESS SIDE)
GW
AC305415BC
CONNECTOR: C-202
JUNCTION BLOCK SIDE
JUNCTION BLOCK
(FRONT VIEW)
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