Mitsubishi Montero (2004+). Manual — part 630
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-9
STEP 2. Check the flexible flat cable (FFC) connection.
(1) The FFC is connected to the A/C control panel assembly.
Check that the FFC connection is not contaminated with
foreign material or loose (Refer to
(2) There should be continuity between the FFC terminals.
Q: Is the FFC normal?
YES : Replace the automatic air conditioning control panel.
Then go to Step 3.
NO : Replace the FFC. Then go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Q: Is DTC 11 or 12 set?
YES : Replace the A/C-ECU.
NO : The procedure is complete.
DTC 13, 14: Ambient Air Temperature Sensor System
AC205264AB
AHBIENT AIR
TEMPERATURE
SENSOR
A/C-ECU
SIGNAL INPUT
CIRCUIT
Outside Air Temperature Sensor Circuit
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-10
.
DTC SET CONDITION
• DTC 13 is set if there is a defective connector
connection, or if there is an open circuit in the
harness.
• DTC 14 is set if there is a short circuit in the ambi-
ent air temperature sensor input circuit.
.
TROUBLESHOOTING HINT
• Malfunction of connector.
• Malfunction of the harness.
• Malfunction of the ambient air temperature sen-
sor.
• Malfunction of the A/C-ECU.
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B (Vehicles without
CAN communication system)
STEP 1. Using scan tool MB991958, check data list item 13:
Ambient air temperature sensor.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
Item 13: Ambient air temperature sensor
OK: The outside air temperature and indicated temperature on
scan tool MB991958 are almost equal.
Q: Are the outside air temperature and temperature
displayed on scan tool MB991958 almost equal?
YES : It can be assumed that this malfunction is intermittent
(Refer to GROUP 00
− How to Cope with Intermittent
Malfunction
NO : Go to Step 2.
AC001534 AB
CONNECTOR: A-29
AC001536 AB
CONNECTORS: D-24, D-28
D-24
D-28
AC307591 AB
MB991911
DATA LINK
CONNECTOR
MB991824
MB991827
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-11
STEP 2. Check the ambient air temperature sensor.
Disconnect ambient air temperature sensor connector A-29,
and measure the resistance between terminal numbers 1 and
2.
Measure the resistance between the sensor terminals under at
least two temperatures.
NOTE: The temperature conditions at the check should be
within the range shown in the characteristic diagram.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Replace the ambient air temperature sensor. Then go
to Step 5.
AC204166
CONNECTOR : A-29
AP
A-29(B)
A-29(B)
1
2
HARNESS
SIDE
AC001680AB
OUTSIDE AIR
TENPERATURE SENSOR
REGISTANCE k
Ω
10
8
6
4
2
0
-10
0
10
20
30
40
(14) (32)
(50)
(68)
(86) (104)
TEMPERATURE ˚C (˚F)
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-12
STEP 3. Check ambient air temperature sensor connector
A-29 and A/C-ECU connector D-24 for damage.
Q: Is ambient air temperature sensor connector A-29 and
A/C-ECU connector D-24 in good condition?
YES : Go to Step 4.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
. Then go
to Step 5.
STEP 4. Check the wiring harness between ambient air
temperature sensor connector A-29 (terminals 1 and 2) and
A/C-ECU D-24 (terminals 22 and 29).
AC204166
CONNECTOR : A-29
AP
A-29(B)
A-29(B)
1
2
HARNESS
SIDE
AC204170
CONNECTOR : D-24
D-24(B)
D-24(B)
CQ
22
23
30
31
25
26
33
34
32
24
28
3635
27
29
21
HARNESS
SIDE
AC204166
CONNECTOR : A-29
AP
A-29(B)
A-29(B)
1
2
HARNESS
SIDE
AC204170
CONNECTOR : D-24
D-24(B)
D-24(B)
CQ
22
23
30
31
25
26
33
34
32
24
28
3635
27
29
21
HARNESS
SIDE
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