Mitsubishi Montero (2004+). Manual — part 634
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-25
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 32:
Mode selection damper control motor and potentiometer.
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 32: mode selection damper control motor and potentiome-
ter
Q: Does the data list show approximately 0% (at FACE
position), approximately 60% (at FOOT position),
approximately 80% (at FOOT/DEF position), and
approximately 100% (at DEF position)?
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.
AC307591 AB
MB991911
DATA LINK
CONNECTOR
MB991824
MB991827
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-26
STEP 2. Check the mode selection damper control motor
and potentiometer.
CAUTION
Do not apply battery voltage when the damper is in the
FACE or DEF position.
Check the mode selection damper control motor by the follow-
ing procedures.
While checking the mode selection damper control motor, mea-
sure the resistances between terminal Nos. 3 and 5 as well as
terminal Nos. 3 and 7. At this time, the resistances should
change gradually within the standard value.
Standard value: 0.96
− 5.76 kΩ
Q: Does mode selection damper control motor and
potentiometer work normally?
YES : Go to Step 3.
NO : Replace the mode selection damper control motor
and potentiometer. Then go to Step 5.
LEVER
POSITION
BATTERY
CONNECTION
LEVER
OPERATION
At the DEF
position
• Connect terminal 1 to
the positive battery
terminal
• Connect terminal 2 to
the negative battery
terminal
The lever moves
from the DEF
position to the
outside position
At the FACE
position
• Connect terminal 2 to
the positive battery
terminal
• Connect terminal 1 to
the negative battery
terminal
The lever moves
from the FACE
position to the
inside position
ACX01457
FACE POSITION
DEF POSITION
AB
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-27
STEP 3. Check mode selection damper control motor and
potentiometer connector D-22 and A/C-ECU connector
D-24 for damage.
Q: Is mode selection damper control motor and
potentiometer connector D-22 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 mode selection
damper control motor and potentiometer connector D-22
(terminals 7, 3 and 5) and A/C-ECU D-24 (terminals 21, 32
and 29).
Q: Is the wiring harness between mode selection damper
control motor and potentiometer connector D-22
(terminals 7, 3 and 5) and A/C-ECU D-24 (terminals 21,
32 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-22, D-24
D-24(B)
D-24(B)
CA
D-22(B)
D-22(B)
HARNESS SIDE
HARNESS SIDE
22
23
30
31
25
26
33
34
32
24
28
3635
27
29
21
7 6 5 4 3 2 1
AC204188
CONNECTORS : D-22, D-24
D-24(B)
D-24(B)
CA
D-22(B)
D-22(B)
HARNESS SIDE
HARNESS SIDE
22
23
30
31
25
26
33
34
32
24
28
3635
27
29
21
7 6 5 4 3 2 1
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-28
STEP 5. Recheck for diagnostic trouble code.
Q: Is DTC 32 set?
YES : Return to Step 1.
NO : The procedure is complete.
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Communication with scan tool is not Possible.
.
TECHNICAL DESCRIPTION
The harness wires between the A/C-ECU power sup-
ply line or the A/C-ECU and the data link connector
may be defective.
.
TROUBLESHOOTING HINT
• Malfunction of connector.
• Malfunction of the harness.
• Malfunction of the A/C-ECU.
Data Link Connector Circuit
AC204170
CONNECTORS : D-23, D-24, D-28, D-118
D-23(B)
D-24(B)
D-28
EH
D-118(B)
AC204173
CONNECTORS : D-210, D-211, D-220
D-210
D-211(B)
BR
D-220
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст