Mitsubishi 380. Manual — part 746
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-395
STEP 2. 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 automatic
air conditioning system.
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 resistances at the wiring harness sides of joint
connector (3) C-02 and A/C-ECU connector C-15 automatic
air conditioning system>.
(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.
16DB408A
CONNECTOR: C-02
16DB477A
C-15 HARNESS SIDE
CONNECTOR: C-15
C-15 (B)
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-396
(4) Measure the resistance between joint connector (3)
terminal 17 and A/C-ECU connector C-15 terminal 14
automatic air conditioning system.
OK: 2 ohms or less
(5) Measure the resistance between joint connector (3)
terminal 6 and A/C-ECU connector C-15 terminal 15
automatic air conditioning system>.
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 55,
Auto-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
CONTROLLER AREA NETWORK (CAN)
54C-397
DIAGNOSTIC ITEM 15: Diagnose the lines between CAN main bus line and the SRS-ECU.
CAUTION
When servicing a CAN bus line, ground yourself
by touching a metal object such as an unpainted
water pipe. If you fail to do so, a component con-
nected to the CAN bus line may be damaged.
.
TROUBLE JUDGMENT
If the MUT-III cannot received signals from the
SRS-ECU, CAN bus line connector(s) are broken or
an open circuit has occurred.
.
COMMENTS ON TROUBLE SYMPTOM
The wiring harness wire or connectors may have
loose, corroded, or damage terminals, or terminals
pushed back in the connector, or the SRS-ECU may
be defective.
.
TROUBLESHOOTING HINTS
• Refer to circuit diagrams GROUP-
• Refer to configuration diagrams GROUP-
• The wiring harness or connectors may have
loose, corroded, or damage terminals, or termi-
nals pushed back in the connector
• The SRS-ECU may be defective
16DB408A
CONNECTOR: C-02
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
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38
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47
DIAGNOSIS
CONTROLLER AREA NETWORK (CAN)
54C-398
DIAGNOSIS
Required Special Tool:
• MB991223: Harness Set
STEP 1. Check joint connector C-02 and 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: Are joint connector C-02 and SRS-ECU connector C-121
in good condition?
YES : Go to Step 2.
NO : Repair the damaged parts. Replace the joint
connector as necessary.
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
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47
16DB408A
CONNECTOR: C-02
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