Mitsubishi 380. Manual — part 671
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-95
STEP 13. Check A/C-ECU connector C-15 automatic air
conditioning system for loose, corroded or damaged
terminals, or terminals pushed back in the connector.
• Refer to circuit diagrams GROUP-
• Refer to configuration diagrams GROUP-
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 automatic air conditioning
system in good condition?
YES : Go to Step 14.
NO : Repair the damaged parts.
16DB477A
C-15 HARNESS SIDE
CONNECTOR: C-15
C-15 (B)
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-96
STEP 14. Check the CAN_H line (communication line only)
between joint connector (3) and A/C-ECU connector for a
short to the power supply. Measure the voltage at joint
connector (3) C-02.
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 automatic air conditioning system, and
measure the voltage at the wiring harness side of joint
connector (3) C-02.
(2) Turn the ignition switch to the "ON" position.
16DB408A
CONNECTOR: C-02
16DB477A
C-15 HARNESS SIDE
CONNECTOR: C-15
C-15 (B)
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-97
(3) Measure the voltage between joint connector (3) terminal
17 and body ground.
OK: 1.0 V or less
CAUTION
Strictly observe the specified wiring harness repair proce-
dure. For details refer to
Q: Does the voltage measure 1.0 V or less?
YES : If the voltage measures 1.0 V or less, diagnose CAN
bus lines thoroughly by referring to
NO : If the voltage measures more than 1.0 V, repair the
wiring harness between joint connector (3) and the
A/C-ECU connector.
STEP 15. Check the CAN_H line (communication line
including the SRS-ECU) between joint connector (3) and
the SRS-ECU connector for short to the power supply.
Measure the voltage at joint connector (3) C-02.
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 measure the
voltage at the wiring harness side of joint connector (3)
C-02.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between joint connector (3) terminal 3
and body ground.
OK: 4.0 V or less
Q: Does the voltage measure 4.0 V or less?
YES : If the voltage measures 4.0 V or less, go to Step 18.
NO : If the voltage measures more than 4.0 V, go to Step
16.
AC209365
11
22
10
21
9
20
8
19
7
18
6
17
5
16
4
15
3
14
2
13
1
12
AC209365
AC209365GD
HARNESS SIDE: C-02
TEST
HARNESS
16DB408A
CONNECTOR: C-02
AC209365
11
22
10
21
9
20
8
19
7
18
6
17
5
16
4
15
3
14
2
13
1
12
AC209365FU
HARNESS SIDE: C-02
TEST
HARNESS
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-98
STEP 16. 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 17.
NO : Repair the damaged parts.
STEP 17. Check the CAN_ H line (communication line only)
between the SRS-ECU connector and the joint connector
for a short circuit. Measure the voltage at joint connector
C-03.
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 C-03 and SRS-ECU connector
C-121, and measure the voltage at joint connector C-03.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between joint connector terminal 3 and
body ground.
OK: 1.0 V or less
CAUTION
Strictly observe the specified wiring harness repair proce-
dure. For details refer to
Q: Does the voltage measure 1.0 V or less?
YES : If the voltage measures 1.0 V or less, diagnose CAN
bus lines thoroughly by referring to
NO : If the voltage measures more than 1.0 V, repair the
wiring harness between joint connector C-03 and
SRS-ECU connector C-121.
16DB478A
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
16DB408A
CONNECTOR: C-02
AC209365
11
22
10
21
9
20
8
19
7
18
6
17
5
16
4
15
3
14
2
13
1
12
AC209365FU
HARNESS SIDE: C-02
TEST
HARNESS
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