Mitsubishi 380. Manual — part 677
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-119
STEP 39. Check the CAN_L 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.
• Refer to circuit diagrams GROUP-
• Refer to configuration diagrams GROUP-
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-120
(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 40. Check the CAN_L 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
14 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 43.
NO : If the voltage measures more than 4.0 V, go to Step
41.
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
AC209365
AC209365GE
HARNESS SIDE: C-02
TEST
HARNESS
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-121
STEP 41. 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 42.
NO : Repair the damaged parts.
STEP 42. Check the CAN_L line (communication line only)
between the SRS-ECU connector and joint connector (3)
for a short to the power supply. Measure the voltage at
joint connector (3) C-02.
• Refer to circuit diagrams GROUP-
• Refer to configuration diagrams GROUP-
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 SRS-ECU
connector C-121, 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) C-02
terminal 14 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) C-02 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
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
AC209365
11
22
10
21
9
20
8
19
7
18
6
17
5
16
4
15
3
14
2
13
1
12
AC209365
AC209365GE
HARNESS SIDE: C-02
TEST
HARNESS
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-122
STEP 43. Check the CAN_L line (communication line
including the multi-center display unit ) between joint
connector (3) and middle-grade multi-center display
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 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
19 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 46.
NO : If the voltage measures more than 4.0 V, go to Step
44.
STEP 44. Check multi-center display unit connector C-05
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 multi-center display unit connector C-05 in good
condition?
YES : Go to Step 45.
NO : Repair the damaged parts.
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
AC209365
AC209365FV
HARNESS SIDE: C-02
TEST HARNESS
16DB490A
CONNECTOR: C-05
HARNESS SIDE
C-05 (B)
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