Mitsubishi 380. Manual - part 722

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-299

Step 19. Check the CAN bus lines (communication line 
only) between joint connector (3) and the data link 
connector. Measure the resistance at joint connector (3) 
C-02 and data link connector C-125.

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 measure the 

resistance between the wiring harness side connector of 
joint connector (3) C-02 and wiring harness side connector 
of data link connector C-125.

(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.

16DB517A

 

C-125

CONNECTORS: C-02, C-125

C-02

C-02

C-125 (B)

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-300

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

terminal 18 and data link connector terminal 14.

OK: 2 ohms or less

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

terminal 7 and data link connector terminal 6.

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 <all the resistances measure 2 ohms or less: When 
any repair done> : Retest the system.
YES <all the resistances measure 2 ohms or less: When 
no repair done> : Diagnose CAN bus lines thoroughly by 

referring to 

P.54C-323

 <Vehicles with multi-center 

display >.

NO <If either of the resistances measures more than 2 
ohms or all the resistances measure more than 2 ohms> 
: 

Repair the wiring harness wires between joint 
connector (3) and the data link connector.

AC204582DI

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

TEST 
HARNESS

Y

8

16

15

7

5

1314

6

12

4

2

1011

3

9

1

HARNESS SIDE: C-125

AC204582

HARNESS SIDE: C-02

TEST 
HARNESS

DH

11
22

10
21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

Y

8

16

15

7

5

1314

6

12

4

2

1011

3

9

1

TEST 
HARNESS

HARNESS SIDE: C-125

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-301

DIAGNOSTIC ITEM 7: Diagnose a terminator resistor at either end

NOTE: When diagnosing CAN-BUS on vehicles 
with manual transmission (M/T), disregard 
A/T-ECU and it’s wiring circuits and measure 
between ABS-ECU and ENGINE-ECU only.

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.

.

16DB402A

A-02 (GR)

CONNECTOR: A-02 

A-02 HARNESS CONNECTOR:

16DB407A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

A/T

CONTROL

UNIT

16DB505A

C-101

C-29

C-02

CONNECTORS: C-02, C-29, C-101

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-302

TROUBLE JUDGMENT

A terminator resistor at either end (including the CAN 
bus lines) may be damaged, when the resistance 
between the CAN bus lines (CAN_L and H lines) is 
120 

± 20 Ω.

.

COMMENTS ON TROUBLE SYMPTOM

The CAN bus line harness wires or connectors may 
be damaged or the combination meter or the 
ENGINE-ECU may be defective.

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• The wiring harness or connectors may have 

loose, corroded, or damage terminals, or termi-
nals pushed back in the connector

• The combination meter may be defective

• The ABS-ECU may be defective

• The A/T-ECU may be defective

• The ENGINE-ECU may be defective

NOTE: When diagnosing CAN-BUS on vehi-

cles with manual transmission (M/T), disregard 
A/T-ECU and it’s wiring circuits and measure 
between ABS-ECU and ENGINE-ECU only.