Mitsubishi Galant (2004+). Manual — part 733
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MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-71
STEP 5. Check the wiring harness between A/C-ECU
connector C-15 (terminal 20), C-16 (terminal 24) and air
thermo sensor connector C-126 (terminals 1 and 2).
AC305234
CONNECTORS: C-15, C-16
C-16 (B)
HARNESS SIDE
C-16
C-15
C-15 (B)
HARNESS SIDE
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
AG
AC305232
C-03
C-126
C-03
HARNESS SIDE
C-126
AP
CONNECTORS: C-03, C-126
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MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-72
NOTE: Also check joint connector C-03 for loose, corroded, or
damaged terminals, or terminals pushed back in the connector.
If joint connector C-03 is damaged, repair or replace the con-
nector as described in GROUP 00E, Harness Connector
Inspection
.
Q: Is the wiring harness between A/C-ECU connector C-15
(terminal 20), C-16 (terminal 23) and air thermo sensor
connector C-126 (terminals 1 and 2) in good condition?
YES : Go to Step 6.
NO : Repair the wiring harness. Then go to Step 7.
STEP 6. Check the air thermo sensor.
(1) Disconnect the air thermo sensor connector C-126.
(2) Measure the resistance between connector terminals 1 and
2 under at least two different temperatures. The resistance
values 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 : Replace the A/C-ECU. Then go to Step 7.
NO : Replace the air thermo sensor. Then go to Step 7.
AC305231
CONNECTOR: C-126
CB
HARNESS SIDE
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)
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MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-73
STEP 7. Recheck for diagnostic trouble code.
Check again if the DTC is set.
1. Connect scan tool MB991958 to the data link connector
2. Turn the ignition switch to the "ON" position.
3. Check if the DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result satisfactory?
YES : The procedure is complete.
NO : Return to Step 1.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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MANUAL A/C DIAGNOSIS
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HEATER, AIR CONDITIONING AND VENTILATION
55A-74
DTC B1041, B1042: Air Mixing Damper Control Motor and Potentiometer (Potentiometer system)
.
DTC SET CONDITION
• DTC B1041 or B1042 is set if there is an open or
short circuit in the potentiometer input circuit, or if
there is an open circuit in the power circuit or
earth circuit.
.
TECHNICAL DESCRIPTION (COMMENT)
Current trouble
• The A/C-ECU, the air mixing damper control
motor and potentiometer, or connector(s) or wir-
ing between the two may be defective.
Past trouble
• If DTC B1041 or B1042 is stored as a past trou-
ble, carry out diagnosis with particular emphasis
on wiring and connector(s) between the A/C-ECU
and the air mixing damper control motor and
potentiometer. If the connectors and wiring are
normal, and obviously the ECU is the cause of
the trouble, replace the ECU. If in doubt, do not
replace the ECU.
TROUBLESHOOTING HINT
• Malfunction of connector.
• Malfunction of the harness.
• Malfunction of the air mixing damper control
motor and potentiometer.
• Malfunction of the A/C-ECU.
AIR MIXING
DAMPER CONTROL
MOTOR AND
POTENTIOMETER
JOINT
CONNECTOR (2)
A/C-ECU
Air Mixing Damper Control Motor Potentiometer Circuit
AC305231AZ
CONNECTOR: C-03
AC305233
C-16 (B)
C-15 (B)
BF
C-105
CONNECTORS: C-15, C-16, C-105
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