Mitsubishi Outlander (2003+). Manual — part 529
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-11
•
Malfunction of the magnetic clutch
•
Malfunction of the manual air conditioner control
panel (A/C-ECU)
•
Damaged the wiring harness or connectors
•
Malfunction of the engine-A/T-ECU
DIAGNOSIS
STEP 1. Check the defogger and outside/inside
air selection damper control motor operation.
Q: Do the defogger and outside/inside air selection
damper control motor work normally?
YES :
Go to Step 2.
NO :
Refer to Inspection procedure 9
"Malfunction of the A/C-ECU power supply
system
STEP 2. Check the blower motor operation.
Q: Does the blower motor work normally?
YES :
Go to Step 3.
NO :
Refer to Inspection procedure 4 "Blower fan
and motor do not turn
STEP 3. Check the A/C compressor.
Check the A/C compressor for compressor oil leaks.
Q: Is the check result satisfactory?
YES :
Go to Step 4.
NO :
Replace the A/C compressor or the
expansion valve.
STEP 4. Measure the voltage at the B-27 A/C
compressor connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Disconnect engine-ECU connector C-134, and
earth terminal 8. <2000>
AC308688
Connector: B-27 <2000>
Harness side
1
B-27(B)
AB
AC308706
Connector: B-27
<2400-LHD>
Harness side
1
B-27(B)
AB
AC309474AB
Connector: C-134 <2000>
Harness side
22
9
14
15
2 1
3
16
1918
5 4
17
6
21
7
20
8
25
12
10
23
11
24
26
13
JAE-E
AC309471
22
9
14
15
2 1
3
16
1918
5 4
17
6
21
7
20
8
25
12
10
23
11
24
26
13
JAE-E
AC309471
Connector C-134
(Harness side)
AB
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-12
(4) Disconnect engine-ECU or engine-A/T-ECU
connector C-139, and earth terminal 8. <2400>
(5) Measure the voltage between terminal 1 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 18.
NO :
Go to Step 5.
STEP 5. Check the A/C compressor relay
continuity.
Refer to
.
Q: Is the A/C compressor relay in good condition?
YES :
Go to Step 6.
NO :
Replace the A/C compressor relay.
STEP 6. Measure the voltage at B-18X A/C
compressor relay connector.
(1) Remove the relay, and measure at the relay box
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 3 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Go to Step 7.
AC309486
Connector: C-139 <2400-LHD>
AC
Harness side
C-139 (GR)
AC309471
AC309471AC
Connector C-139
(Harness side)
AC301541BU
Connector B-27
(Harness side)
1
AC309476AB
Front of
vehicle
Relay box side
1
3
2
4
B-18X
-
Connector: B-18X
AC301541BV
Connector B-18X
(Relay box side)
Front of
vehicle
1
3
2
4
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-13
STEP 7. Connector check: B-18X A/C
compressor relay connector
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the connector.
STEP 8. Check the wiring harness between B-18X
A/C compressor relay connector terminal No.3
and the ignition switch (IG2).
AC309476AB
Front of
vehicle
Relay box side
1
3
2
4
B-18X
-
Connector: B-18X
AC309476AB
Front of
vehicle
Relay box side
1
3
2
4
B-18X
-
Connector: B-18X
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-14
NOTE:
Prior to the wiring harness inspection, check interme-
diate connector C-106, junction block connectors
C-203 and C-205, and repair if necessary.
•
Check the A/C compressor relay power supply
line for open circuit.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
NO :
Repair the wiring harness.
STEP 9. Measure the voltage at B-18X A/C
compressor relay connector.
(1) Remove the relay, and measure at the junction
block side.
(2) Measure the voltage between terminal 4 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 12.
NO :
Go to Step 10.
AC308718
Connector: C-106
AC
C-106(GR)
<LHD>
AC308721
Connectors: C-203, C-205
AQ
Junction block (Front view)
C-205
Harness side
Harness side
C-205
C-203
C-203
<LHD>
4
6 5
3
2
1
21
7
16 15
17
18
20 19
1
2
3
4
5
6
23 22
24
25
28
26
27
9
8
10
11
14
12
13
AC309476AB
Front of
vehicle
Relay box side
1
3
2
4
B-18X
-
Connector: B-18X
AC301541BW
Connector B-18X
(Relay box side)
Front of
vehicle
1
3
2
4
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