Mitsubishi 380. Manual — part 668

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-83

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991219: Inspection Test Harness

STEP 1. Check ENGINE-ECU connector B-21, combination
meter connector C-101 and data link connector C-125 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: Are ENGINE-ECU connector B-21, combination meter

connector C-101 and data link connector C-125 in good
condition?
YES : Go to Step 2.
NO : Repair the damaged parts.

16DB400A

COVER

ENGINE
CONTROL
UNIT

AIR
CLEANER

16DB475A

CONNECTORS: C-101, C-125

C-101

C-125

C-125 (B)

C-101 HARNESS SIDE

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-84

STEP 2. Check the CAN_H-side bus line (communication

line including ECUs) for a short to the power supply.

Measure the voltage at 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 ENGINE-ECU connector B-21 and combination

meter connector C-101, and measure the voltage at the
harness side of data link connector C-125.

(2) Turn the ignition switch to the "ON" position.

16DB400A

COVER

ENGINE
CONTROL
UNIT

AIR
CLEANER

16DB475A

CONNECTORS: C-101, C-125

C-101

C-125

C-125 (B)

C-101 HARNESS SIDE

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-85

(3) Measure the voltage between data link connector terminal 6

and body ground.

OK: 4.0 V or less

Q: Does the voltage measure 4.0 V or less?

YES : If the voltage measures 4.0 V or less, go to Step 3.
NO : If the voltage measures more than 4.0 V, go to Step 4.

AC209365

HARNESS SIDE: C-125

TEST
HARNESS

FN

Y

8

16

15

7

5

1314

6

12

4

2

1011

3

9

1

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-86

STEP 3. Check the CAN_L-side bus line (communication

line including ECUs) for a short to the power supply.

Measure the voltage at 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 ENGINE-ECU connector B-21 and combination

meter connector C-101, and measure the voltage at the
harness side of data link connector C-125.

(2) Turn the ignition switch to the "ON" position.

16DB400A

COVER

ENGINE
CONTROL
UNIT

AIR
CLEANER

16DB475A

CONNECTORS: C-101, C-125

C-101

C-125

C-125 (B)

C-101 HARNESS SIDE