Mitsubishi 380. Manual - part 731

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-335

STEP 10. Check the CAN bus lines between joint 
connector (3) and the ETACS-ECU. Measure the resistance 
between joint connector (3) C-02 and ETACS-ECU 
connector C-218.

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 ETACS-ECU 

connector C-218, and measure the resistances at the wiring 
harness sides of joint connector (3) C-02 and ETACS-ECU 
connector C-218.

(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.

16DB474A

C-218 (GR)

CONNECTOR: C-218

HARNESS SIDE

JUNCTION BLOCK

(REAR VIEW)

16DB408A

CONNECTOR: C-02

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-336

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

terminal 16 and ETACS-ECU connector terminal 67.

OK: 2 ohms or less

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

terminal 5 and ETACS-ECU connector terminal 66.

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 ETACS-ECU may be suspected. 
Diagnose the ETACS-ECU by referring to GROUP 
54B, Diagnosis 

P.54B-74

.

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 ETACS-ECU connector.

16DB520A

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

HARNESS SIDE: C-218

TEST 
HARNESS

16DB521A

11
22

10
21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

TEST 
HARNESS

TEST 
HARNESS

HARNESS SIDE: C-02

HARNESS SIDE: C-218

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-337

STEP 11. Check A/C-ECU connector C-15 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

.

Q: Is A/C-ECU connector C-15 in good condition?

YES : Go to Step 12.
NO :  Repair the damaged parts.

16DB477A

C-15 HARNESS SIDE

CONNECTOR:  C-15

C-15 (B)

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-338

STEP 12. Using diagnostic tool MB991958, diagnose the 
CAN bus line (Disconnect A/C-ECU connector C-15, and 
check the A/C-ECU system).
(1) Disconnect A/C-ECU connector C-15.
(2) Turn the ignition switch to the "ON" position.

(3) Diagnose CAN bus lines, and check if the MUT-III screen is 

as shown in the illustration.

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.

NOTE: When diagnosing CAN-BUS on vehicles 
not equipped with a multi-centre display, disre-
gard the multi-centre display and it’s wiring cir-
cuits.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Connect A/C-ECU connector C-15.

Q: Does the MUT-III screen correspond to the illustration?

YES : If the MUT-III screen corresponds to the illustration, 

go to Step 13 .

NO :  If the MUT-III screen does not correspond to the 

illustration, go to Step 14.

16DB477A

C-15 HARNESS SIDE

CONNECTOR:  C-15

C-15 (B)

16DB596A

: Red section on screen

ETACS

-ECU

AC-ECU

SRS-ECU

C.DISPLAY

MUT

J/C

METER

-ECU

ENGINE

ECU

ABS-ECU

A/T-ECU