Mitsubishi 380. Manual — part 694

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-186

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991219: Inspection Test Harness

• MB992045: A/T-ECU Check 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-187

STEP 2. Check the CAN_H-side bus line (communication
line including ECUs) for short to ground. Measure the
resistance 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 resistance at the
harness side 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.

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-188

(4) Measure the resistance between data link connector

terminal 6 and body ground.

OK: 1 k

Ω or more

Q: Does the resistance measure 1 k

Ω or more?

YES : If the resistance measures 1 k

Ω or more, go to Step 3

.

NO : If the resistance measures less than 1 k

Ω, go to Step

4.

AC209364

Y

8

16

15

7

5

1314

6

12

4

2

1011

3

9

1

AC209364

AC209364

AC209364

AC209364

AC209364HT

HARNESS SIDE: C-125

TEST
HARNESS

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-189

STEP 3. Check the CAN_L-side bus line (communication
line including ECUs) for short to ground. Measure the
resistance 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 resistance at the
harness side 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.

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

16DB475A

CONNECTORS: C-101, C-125

C-101

C-125

C-125 (B)

C-101 HARNESS SIDE