Mitsubishi 380. Manual - part 748

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-403

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

STEP 1. 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 

P.54C-4

.

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 2.
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-404

STEP 2. Check the CAN bus lines between joint connector 
(3) and the combination meter. Measure the resistance 
between joint connector (3) C-02 and combination meter 
connector C-101.

CAUTION

A digital multimeter should be used. For details refer to 

P.54C-4

.

CAUTION

The test wiring harness should be used. For details refer to 

P.54C-4

.

(1) Disconnect joint connector (3) C-02 and combination meter 

connector C-101, and measure the resistance between 
each wiring harness side connector.

(2) Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION

Disconnect the negative battery terminal. For details refer 
to 

P.54C-4

.

(3) Disconnect the negative battery terminal.

16DB476A

 

HARNESS SIDE

C-101

CONNECTORS: C-02, C-101

C-02

C-02

C-101

CAN COMMUNICATION SIGNAL TABLE

CONTROLLER AREA NETWORK (CAN)

54C-405

(4) Measure the resistance between joint connector (3) 

terminal 15 and combination meter connector terminal 15.

OK: 2 ohms or less

(5) Measure the resistance between joint connector (3) 

terminal 4 and combination meter connector terminal 14.

OK: 2 ohms or less

CAUTION

Strictly observe the specified wiring harness repair proce-
dure. For details refer to 

P.54C-5

.

Q: Do all the resistances measure 2 ohms or less?

YES : If all the resistances measure 2 ohms or less, power 

supply to the combination meter may be suspected. 
Diagnose the combination meter. Refer to GROUP 
54A, Combination meter assembly 

P.54A-45

.

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 combination meter connector. 

CAN COMMUNICATION SIGNAL TABLE

M1548300400059

AC204582

HARNESS SIDE: C-02

BZ

11
22

10
21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

G

G

22

11

5

16

19

20

21

17

18

8

10 9

7 6

13

1514

12

2

4 3

1

TEST 
HARNESS

HARNESS SIDE: C-101

TEST 
HARNESS

AC204582

HARNESS SIDE: C-02

TEST 
HARNESS

11
22

10
21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

G

G

22

11

5

16

19

20

21

17

18

8

10 9

7 6

13

1514

12

2

4 3

1

TEST 
HARNESS

HARNESS SIDE: C-101

CA

CAN COMMUNICATION SIGNAL TABLE

CONTROLLER AREA NETWORK (CAN)

54C-406

SIGNAL

TRANSMITTER 
ECU

RECEIVER 
ECU

ENGINE-EC
U

A/T-ECU

ABS-ECU

MULTI-CENT
ER DISPLAY 
UNIT 
(MIDDLE-
GRADE 
TYPE)

COMBINATI
ON METER

A/C-ECU

ETACS-ECU

Engine speed signal

Engine- 
ECU

−

−

×

−

×

×

−

A/C information signal

−

−

−

−

−

×

−

Vehicle speed signal

−

×

−

−

×

×

−

Vehicle stop signal

−

−

−

×

×

×

×

Malfunction indicator 
lamp request signal

−

−

−

−

×

−

−

Auto-cruise control 
indicator lamp signal

−

−

−

−

×

−

−

Engine coolant 
temperature signal

−

−

−

−

×

×

−

Selector position signal A/T-ECU

−

−

×

−

×

×

×

ABS warning light 
request signal

ABS-ECU

−

−

−

−

×

−

−

SRS warning light 
request signal

SRS-ECU

−

−

−

−

×

−

−

Communication 
continuation request 
signal

Multi-cent
er display 
unit 

−

−

−

−

−

×

×

Ignition switch (ACC) 
signal

−

−

−

−

−

×

×

Adjustment request 
signal

−

−

−

−

−

×

×

Customize signal

−

−

−

−

−

×

×

Tone alarm sound 
signal

−

−

−

−

−

×

×

Communication 
continuation request 
signal

Combinati
on meter

−

−

−

−

−

−

×

Vehicle speed signal

−

−

−

−

−

−

×

Ignition switch (IG1) 
signal

−

−

−

−

−

−

×

Seat belt signal

−

−

−

−

−

−

×

Fuel information signal

×

−

−

−

−

−

−

Communication 
continuation request 
signal

A/C-ECU

−

−

−

−

−

−

×

Compressor signal

×

−

−

−

−

−

−

Idle-up request signal

×

−

−

−

−

−

−