Mitsubishi Galant 9G. Manual — part 1348
DIAGNOSIS
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-496
STEP 10. Check the CAN bus lines between joint
connector (3) and the ETACS-ECU. Measure the resistance
between joint connector (3) C-02 and ETACS-ECU
connector C-218.
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 ETACS-ECU
connector C-218, and measure the resistances at the wiring
harness sides of joint connector (3) C-02 and ETACS-ECU
connector C-218.
(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
AC305413
C-218 (GR)
CONNECTOR: C-218
AI
HARNESS SIDE
JUNCTION BLOCK
(REAR VIEW)
68
74
63
66
72
73
67
65 64
61
70
71
62
69
60
57
58
59
56 55
52
54 53
51
DIAGNOSIS
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-497
(4) Measure the resistance between joint connector (3)
terminal 16 and ETACS-ECU connector terminal 73.
OK: 2 ohms or less
(5) Measure the resistance between joint connector (3)
terminal 5 and ETACS-ECU connector terminal 72.
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 ETACS-ECU may be suspected.
Diagnose the ETACS-ECU by referring to GROUP
54B, 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 ETACS-ECU connector.
AC204582
11
22
10
21
9
20
8
19
7
18
6
17
5
16
4
15
3
14
2
13
1
12
51
53
54
52
55
56
595857
60
69
62
71 70
61
64
65
67
7372
66
63
74
68
TEST
HARNESS
CL
HARNESS SIDE: C-02
HARNESS SIDE: C-218
TEST
HARNESS
AC204582
11
22
10
21
9
20
8
19
7
18
6
17
5
16
4
15
3
14
2
13
1
12
51
53
54
52
55
56
595857
60
69
62
71 70
61
64
65
67
7372
66
63
74
68
TEST
HARNESS
CN
TEST
HARNESS
HARNESS SIDE: C-02
HARNESS SIDE: C-218
DIAGNOSIS
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-498
STEP 11. Check A/C-ECU connector C-10 <manual air
conditioning system (low)> or C-15 <manual air
conditioning system (middle) or automatic air conditioning
system> 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-10 <manual air conditioning
system (low)> or C-15 <manual air conditioning system
(middle) or automatic air conditioning system> in good
condition?
YES : Go to Step 12.
NO : Repair the damaged parts.
AC305234AB
C-10 HARNESS SIDE
C-15 HARNESS SIDE
CONNECTORS: C-10, C-15
C-10 (B)
C-15 (B)
DIAGNOSIS
TSB Revision
CONTROLLER AREA NETWORK (CAN)
54C-499
STEP 12. Using scan tool MB991958, diagnose the CAN
bus line (Disconnect A/C-ECU connector C-10 <manual air
conditioning system (low)> or C-15 <manual air
conditioning system (middle) or automatic air conditioning
system>, and check the A/C-ECU system).
(1) Disconnect A/C-ECU connector C-10 <manual air
conditioning system (low)> or C-15 <manual air
conditioning system (middle) or automatic air conditioning
system>.
(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-10 <manual air conditioning
system (low)> or C-15 <manual air conditioning system
(middle) or automatic air conditioning system>.
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.
AC305234AB
C-10 HARNESS SIDE
C-15 HARNESS SIDE
CONNECTORS: C-10, C-15
C-10 (B)
C-15 (B)
AC306074
: Red section on screen
AE
MUT
ETACS
-ECU
AC-ECU
SRS-ECU
ABS-ECU
J/C
METER
-ECU
PCM
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