Mitsubishi 380. Manual — part 733

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-343

STEP 16. Check the CAN bus lines between joint
connector (3) and the SRS-ECU connector. Measure the
resistance between joint connector (3) C-02 and SRS-ECU
connector C-121.

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 SRS-ECU

connector C-121, and measure the resistance at the wiring
harness sides of joint connector (3) C-02 and SRS-ECU
connector C-121.

(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.

16DB478A

CONNECTOR: C-121

HARNESS SIDE

C-121 (Y)

48

21

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32

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16DB408A

CONNECTOR: C-02

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-344

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

terminal 3 and SRS-ECU connector C-121 terminal 32.

OK: 2 ohms or less

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

terminal 14 and SRS-ECU connector C-121 terminal 43.

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 SRS-ECU may be suspected. Diagnose
the supplemental restraint system. Refer to GROUP
52B, SRS air bag diagnosis, equipment diagnosis

P.52B-18

.

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 SRS-ECU connector C-121.

STEP 17. Check multi-center display unit connector C-05
for loose, corroded or damaged terminals, or terminals
pushed back in the connector.

NOTE: If diagnosing CAN-BUS on vehicle not equipped
with multi-centre display, go to Step 20.

16DB522A

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

TEST
HARNESS

HARNESS SIDE: C-121

48

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16DB523A

11
22

10
21

9

20

8

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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-121

48

21

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47

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-345

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 multi-center display unit connector C-05 in good

condition?
YES : Go to Step 18.
NO : Repair the damaged parts.

STEP 18. Using diagnostic tool MB991958, diagnose the
CAN bus line (Disconnect multi-center display unit
connector C-05, and check the multi-center display unit
system).

NOTE: If diagnosing CAN-BUS on vehicle not equipped
with multi-centre display, go to Step 20.
(1) Disconnect multi-center display unit connector C-05.
(2) Turn the ignition switch to the "ON" position.

16DB490A

CONNECTOR: C-05

HARNESS SIDE

C-05 (B)

16DB490A

CONNECTOR: C-05

HARNESS SIDE

C-05 (B)

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-346

(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 the multi-center display unit connector C-05.

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

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

go to Step 19 .

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

illustration, go to Step 20.

16DB598A

: Red section on screen

ETACS

-ECU

AC-ECU

SRS-ECU

C.DISPLAY

MUT

J/C

METER

-ECU

ENGINE

ECU

ABS-ECU

A/T-ECU