Mitsubishi Montero (2002-2004). Manual — part 80
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-13
STEP 1. Using scan tool MB991502, check data list item 15:
Heater water temperature sensor.
Check the data list.
Item 15: Heater water temperature sensor
Q: Are the heater core wall temperature and indicated
temperature on scan tool MB991502 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.
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.
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)
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-14
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.
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.
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
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-15
STEP 5. Recheck for diagnostic trouble code.
Q: Is DTC 15 or 16 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC 21, 22: Air Thermo Sensor System
DTC SET CONDITION
• DTC 21 is output if there is a defective connector
connection, or if there is an open circuit in the
harness.
• DTC 22 is output if there is a short circuit in the
air thermo sensor input circuit.
TROUBLESHOOTING HINT
• Malfunction of connector.
• Malfunction of the harness.
• Malfunction of the air thermo sensor.
• Malfunction of the A/C-ECU.
Air Thermo Sensor Circuit
AC205350
AC001535AF
CONNECTORS: D-21, D-24
D-21
D-24
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-16
STEP 1. Using scan tool MB991502, check data list item 21:
Air thermo sensor.
Check the data list.
Item 21: Air thermo sensor
Q: Are the evaporator blowout temperature and indicated
temperature on scan tool MB991502 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.
STEP 2. Check the air thermo sensor.
When the resistance between the sensor terminals is mea-
sured at two or more temperature conditions, the 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 air thermo sensor. Then go to Step 5.
AC204170
CONNECTOR : D-21
CN
1
2
HARNESS
SIDE
AC001043
RESISTANCE k
Ω
8
6
4
2
0
-10
0
10
20
30
40
TEMPERATURE ˚C(˚F)
AB
(14)
(32)
(50)
(86)
(104)
(68)
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