Mitsubishi Galant (2004+). Manual — part 777
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-247
.
TECHNICAL DESCRIPTION (COMMENT)
The A/C-ECU power system may be defective if the
air conditioner, defogger, and outside/inside air
selection damper motor all do not operate normally.
.
TROUBLESHOOTING HINTS
• Malfunction of the A/C-ECU
• Damaged harness wires or connectors
DIAGNOSIS
Required Special Tool:
• MB991223: Test Harness Set
STEP 1. Check A/C-ECU connector C-16 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is A/C-ECU connector C-16 in good condition?
YES : Go to Step 2.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
. Check
that the air conditioning works normally.
AC305415
CONNECTORS: C-211, C-215
JUNCTION BLOCK
(FRONT VIEW)
C-215
C-211
BA
AC305233
HARNESS SIDE
C-16 (B)
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
BX
CONNECTOR: C-16
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-248
STEP 2. Measure the voltage at A/C-ECU connector C-16.
(1) Disconnect A/C-ECU connector C-16 and measure the
voltage at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 28 and ground.
• The measured value should be approximately 12 volts
(battery positive voltage).
Q: Is the measured voltage approx. 12 volts?
YES : Go to Step 4.
NO : Go to Step 3.
STEP 3. Check the wiring harness between A/C-ECU
connector C-16 (terminal 28) and the ignition switch (IG2).
AC305233
HARNESS SIDE
C-16 (B)
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
BX
CONNECTOR: C-16
AC209365
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
CONNECTOR C-16
(HARNESS SIDE)
HK
AC305233
HARNESS SIDE
C-16 (B)
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
BX
CONNECTOR: C-16
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-249
NOTE: Also check joint connector C-03, junction block connec-
tors C-211 and C-215 for loose, corroded, or damaged termi-
nals, or terminals pushed back in the connector. If joint
connector C-03, junction block connector C-211 or C-215 is
damaged, repair or replace the connector as described in
GROUP 00E, Harness Connector Inspection
Q: Is the wiring harness between A/C-ECU connector C-16
(terminal 28) and the ignition switch (IG2) in good
condition?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
NO : Repair the wiring harness. Check that the air
conditioning works normally.
AC305231BP
CONNECTOR: C-03
AC305416
CONNECTORS: C-211, C-215
JUNCTION BLOCK
(FRONT VIEW)
C-215
C-211
HARNESS SIDE
C-211
HARNESS SIDE
C-215
AK
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-250
STEP 4. Measure the voltage at A/C-ECU connector C-16.
(1) Disconnect A/C-ECU connector C-16 and measure the
voltage at the harness side.
(2) Turn the ignition switch to the "ACC" position.
(3) Measure the voltage between terminal 36 and ground.
• The measured value should be approximately 12 volts
(battery positive voltage).
Q: Is the measured voltage approx. 12 volts?
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. Check the wiring harness between A/C-ECU
connector C-16 (terminal 36) and the ignition switch (ACC).
AC305233
HARNESS SIDE
C-16 (B)
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
BX
CONNECTOR: C-16
AC209365
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
CONNECTOR C-16
(HARNESS SIDE)
HL
AC305233
HARNESS SIDE
C-16 (B)
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
BX
CONNECTOR: C-16
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