Mitsubishi Montero (2004+). Manual — part 631
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-13
NOTE: Also check intermediate connector D-28. If intermediate
connector D-28 is damaged, repair or replace the connector as
described in GROUP 00E, Harness Connector Inspection
.
Q: Is 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) in good condition?
YES : Replace the A/C-ECU (Refer to
). Then go
to Step 5.
NO : Repair the wiring harness. Then go to Step 5.
STEP 5. Recheck for diagnostic trouble code.
Q: Is DTC 13 or 14 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC 15, 16: Heater Water Temperature Sensor System
AC204170
CONNECTOR : D-28
AI
2 3
27
32
28
33
16
15
4 5
19
18
29
17
34
7 8
35
22
21
9 10
30
36
31
37
25
24
23
6
20
1
14
26
11
13
12
38
Heater Water Temperature Sensor Circuit
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-14
.
DTC SET CONDITION
• DTC 15 is set if there is a defective connector
connection, or if there is an open circuit in the
harness.
• DTC 16 is set if there is a short circuit in the
heater water temperature sensor input circuit.
.
TROUBLESHOOTING HINT
• Malfunction of connector.
• Malfunction of the harness.
• Malfunction of the heater water 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 15:
Heater water 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.
Check the data list.
Item 15: Heater water temperature sensor
Q: Are the heater core wall temperature and indicated
temperature 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.
AC001535AD
CONNECTORS: D-19, D-24
D-19
D-24
AC307591 AB
MB991911
DATA LINK
CONNECTOR
MB991824
MB991827
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-15
STEP 2. Check the heater water temperature sensor.
When the resistance between the heater water temperature
sensor terminals is measured at two or more temperature con-
ditions, the measured resistance should satisfy the value
shown in the illustration.
NOTE: The temperature conditions at the check shall be within
the range shown in the characteristic diagram.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Replace the heater water temperature sensor. Then
go to Step 5.
STEP 3. Check heater water temperature sensor connector
D-19 and A/C-ECU connector D-24 for damage.
Q: Is heater water temperature sensor connector D-19 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.
AC204170
CONNECTOR : D-19
CL
2 1
HARNESS
SIDE
ACX00826AB
RESISTANCE
(k
Ω)
TEMPERATURE ˚C(˚F)
20
25
30
15
10
5
0
0
20
40
60
80
100
-10
(32)
(68)
(104)
(140) (176) (212)
(14)
AC204188
CONNECTORS : D-19, D-24
D-24(B)
D-24(B)
BX
D-19
D-19
HARNESS SIDE
HARNESS SIDE
2 1
22
23
30
31
25
26
33
34
32
24
28
3635
27
29
21
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-16
STEP 4. Check the wiring harness between heater water
temperature sensor connector D-19 (terminals 1 and 2) and
A/C-ECU D-24 (terminals 23 and 29).
Q: Is the wiring harness between heater water temperature
sensor connector D-19 (terminals 1 and 2) and A/C-ECU
D-24 (terminals 23 and 29) in good condition?
YES : Replace the A/C-ECU (Refer to
). Then go
to Step 5.
NO : Repair the wiring harness. Then go to Step 5.
STEP 5. Recheck for diagnostic trouble code.
Q: Is DTC 15 or 16 set?
YES : Return to Step 1.
NO : The procedure is complete.
AC204188
CONNECTORS : D-19, D-24
D-24(B)
D-24(B)
BX
D-19
D-19
HARNESS SIDE
HARNESS SIDE
2 1
22
23
30
31
25
26
33
34
32
24
28
3635
27
29
21
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