Mitsubishi Galant 9G. Manual — part 1357
DIAGNOSIS
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-532
STEP 11. Check A/C-ECU connector C-15 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
CAUTION
The strand end of the twisted wire should be within 10 cm
(4 inches) from the connector. For details refer to
Q: Is A/C-ECU connector C-15 in good condition?
YES : Go to Step 12.
NO : Repair the damaged parts.
STEP 12. Using scan tool MB991958, diagnose the CAN
bus line (Disconnect A/C-ECU connector C-15, and check
the A/C-ECU system).
(1) Disconnect A/C-ECU connector C-15.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose CAN bus lines, and check if the MUT-III screen is
as shown in the illustration.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Connect A/C-ECU connector C-15.
Q: Does the MUT-III screen correspond to the illustration?
YES : If the MUT-III screen corresponds to the illustration,
go to Step 13 .
NO : If the MUT-III screen does not correspond to the
illustration, go to Step 14.
AC305233 AH
CONNECTOR: C-15
HARNESS SIDE
C-15 (B)
AC305233 AH
CONNECTOR: C-15
HARNESS SIDE
C-15 (B)
AC306075
: Red section on screen
AE
ETACS
-ECU
AC-ECU
SRS-ECU
C.DISPLAY
MUT
J/C
METER
-ECU
PCM
ABS-ECU
DIAGNOSIS
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-533
STEP 13. Check the CAN bus lines between joint
connector (3) and the A/C-ECU. Measure the resistance
between joint connector (3) C-02 and A/C-ECU connector
C-15.
CAUTION
A digital multimeter should be used. For details refer to
.
CAUTION
The test wiring harness should be used. For details refer to
.
(1) Disconnect joint connector (3) C-02 and A/C-ECU
connector C-15, and measure the resistances at the wiring
harness sides of joint connector (3) C-02 and A/C-ECU
connector C-15.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
CAUTION
Disconnect the negative battery terminal. For details refer
to
(3) Disconnect the negative battery terminal.
AC305231AP
CONNECTOR: C-02
AC305233 AH
CONNECTOR: C-15
HARNESS SIDE
C-15 (B)
DIAGNOSIS
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-534
(4) Measure the resistance between joint connector (3)
terminal 17 and A/C-ECU connector terminal 14.
OK: 2 ohms or less
(5) Measure the resistance between joint connector (3)
terminal 6 and A/C-ECU connector terminal 15.
OK: 2 ohms or less
CAUTION
Strictly observe the specified wiring harness repair proce-
dure. For details refer to
Q: Do all the resistances measure 2 ohms or less?
YES : If all the resistances measure 2 ohms or less, power
supply to the A/C-ECU may be suspected. Diagnose
the air conditioning system. Refer to GROUP 55A,
Manual A/C diagnosis
NO : If either of the resistances measures more than 2
ohms or all the resistances measure more than 2
ohms, repair the wiring harness between joint
connector (3) and the A/C-ECU connector.
AC204582
AC204582
HARNESS SIDE: C-02
TEST HARNESS
CG
11
22
10
21
9
20
8
19
7
18
6
17
5
16
4
15
3
14
2
13
1
12
TEST
HARNESS
HARNESS SIDE: C-15
AC204582
8
2
10 9
1
5
3
4
6
7
20191817161514131211
TEST
HARNESS
CI
HARNESS SIDE: C-15
11
22
10
21
9
20
8
19
7
18
6
17
5
16
4
15
3
14
2
13
1
12
TEST HARNESS
HARNESS SIDE: C-02
DIAGNOSIS
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-535
STEP 14. Check SRS-ECU connector C-121 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
CAUTION
The strand end of the twisted wire should be within 10 cm
(4 inches) from the connector. For details refer to
Q: Is SRS-ECU connector C-121 in good condition?
YES : Go to Step 15.
NO : Repair the damaged parts.
STEP 15. Using scan tool MB991958, diagnose the CAN
bus line (Disconnect SRS-ECU connector C-121, and
check the supplemental restraint system).
(1) Disconnect SRS-ECU connector C-121.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose CAN bus lines, and check if the MUT-III screen is
as shown in the illustration.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Connect the SRS-ECU connector C-121.
Q: Does the MUT-III screen correspond to the illustration?
YES : If the MUT-III screen corresponds to the illustration,
go to Step 16 .
NO : If the MUT-III screen does not correspond to the
illustration, go to Step 19.
AC305233 AJ
CONNECTOR: C-121
HARNESS SIDE
C-121 (Y)
48
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
AC305233 AJ
CONNECTOR: C-121
HARNESS SIDE
C-121 (Y)
48
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
AC306075
: Red section on screen
AG
ETACS
-ECU
AC-ECU
SRS-ECU
C.DISPLAY
MUT
J/C
METER
-ECU
PCM
ABS-ECU
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