Mitsubishi 380. Manual — part 207
AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION
55-124
NOTE: Also check junction block connectors C-211 and C-215
for loose, corroded, or damaged terminals, or terminals pushed
back in the connector. If 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
− How to
Cope with Intermittent Malfunctions
.
NO : Repair the wiring harness. Check that the air
conditioning works normally.
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.
25DB096A
CONNECTORS: C-211, C-215
HARNESS SIDE
C-211
HARNESS SIDE
C-215
25DB132A
HARNESS SIDE
C-16 (B)
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
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
AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION
55-125
STEP 5. Check the wiring harness between A/C-ECU
connector C-16 (terminal 36) and the ignition switch (ACC).
NOTE: Also check intermediate connector C-29 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector C-29 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 36) and the ignition switch (ACC) 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.
25DB132A
HARNESS SIDE
C-16 (B)
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
CONNECTOR: C-16
25DB133A
CONNECTORS: C-03, C-29
C-29
C-29
C-03
C-03
AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION
55-126
STEP 6. Measure the voltage at A/C-ECU connector C-15.
(1) Disconnect A/C-ECU connector C-16 and measure the
voltage at the harness side.
(2) Measure the voltage between terminal 3 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 8.
NO : Go to Step 7.
STEP 7. Check the wiring harness between A/C-ECU
connector C-15 (terminal 3) and the battery.
25DB120A
CONNECTOR: C-15
C-105 (B)
HARNESS SIDE
AC209365
CONNECTOR C-15
(HARNESS SIDE)
HM
25DB120A
CONNECTOR: C-15
C-105 (B)
HARNESS SIDE
AUTO A/C DIAGNOSIS
HEATER, AIR CONDITIONING AND VENTILATION
55-127
NOTE: Also check intermediate connector C-29 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector C-29 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 3) and the battery 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 8. Measure the resistance at A/C-ECU connector
C-16.
(1) Disconnect A/C-ECU connector C-16, and measure at the
wiring harness side.
(2) Measure the resistance between terminal 27 and ground.
• The measured value should be 2 ohms or less.
Q: Does the measured resistance value correspond with
this range?
YES : Replace the A/C-ECU, and check that the air
conditioning works normally.
NO : Go to Step 9.
25DB134A
CONNECTOR: C-29
C-29
C-29
25DB132A
HARNESS SIDE
C-16 (B)
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
CONNECTOR: C-16
AC209364
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
CONNECTOR C-16
(HARNESS SIDE)
JE
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