Mitsubishi 380. Manual — part 723
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-303
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991219: Inspection Test Harness
• MB992045: A/T-ECU Check Harness
• MB992044: ENGINE-ECU Check Harness
STEP 1. Check intermediate connector C-29 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 intermediate connector C-29 in good condition?
YES : Go to Step 2.
NO : Repair the damaged parts.
52DB014A
CONNECTOR: C-29
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-304
STEP 2. Check the front wiring harness side CAN bus lines
(communication line including the ENGINE-ECU). Measure
the resistance at intermediate connector C-29.
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 intermediate connector C-29, and measure the
resistance at the male side (at front wiring harness side).
(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.
(4) Measure the resistance between intermediate connector
terminals 11 and 12.
OK: 120
± 20 Ω
Q: Does the resistance measure 120
± 20 Ω?
YES : If the resistance measures 120
± 20 Ω, go to Step 3.
NO : If the resistance does not measure 120
± 20 Ω, go to
Step 7 .
52DB014A
CONNECTOR: C-29
AC204582
2 3
27
32
28
33
16
15
4 5
19
18
29
17
34
7 8
35
22
21
9 10
30
36
31
37
25
24
23
6
20
1
14
26
11
13
12
38
BX
TEST
HARNESS
TEST
HARNESS
MALE SIDE: C-29
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-305
STEP 3. Check joint connector (3) C-02 and combination
meter connector C-101 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
Check the joint connector at the wiring harness side for loose,
corroded or damaged terminals, or terminals pushed back in
the connector, and also check the short pin behind the connec-
tor for corrosion, deformation and delamination.
Q: Are joint connector (3) C-02 and combination meter
connector C-101 in good condition?
YES : Go to Step 4.
NO : Repair the damaged parts. Replace the joint
connector as necessary.
16DB476A
HARNESS SIDE
C-101
CONNECTORS: C-02, C-101
C-02
C-02
C-101
AC209350
1
12
2
13
3
14
4
15
5
16
6
17
7
18
8
19
9
20
10
21
11
22
AB
SHORT PIN
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-306
STEP 4. Check the CAN bus lines (communication line
including the combination meter) between joint connector
(3) and the combination meter. Measure the resistance 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
resistance at the wiring harness side of joint connector (3)
C-02.
(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.
(4) Measure the resistance between joint connector (3)
terminals 4 and 15.
OK: 120
± 20 Ω
Q: Does the resistance measure 120
± 20 Ω?
YES : If the resistance measures 120
± 20 Ω, diagnose CAN
bus lines thoroughly by referring to
NO : If the resistance does not measure 120
± 20 Ω, go to
Step 5 .
16DB408A
CONNECTOR: C-02
AC209438
11
22
10
21
9
20
8
19
7
18
6
17
5
16
4
15
3
14
2
13
1
12
TEST
HARNESS
AQ
TEST
HARNESS
HARNESS SIDE: C-02
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