Mitsubishi 380. Manual — part 692

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-178

(1) Disconnect A/T- ECU connector B-19 and ABS-ECU

connector A-02, and measure the resistance at the harness
side of A/T- ECU connector B-19.

(2) Turn the ignition switch to the "LOCK" (OFF) position.

NOTE: When diagnosing CAN BUS on vehicles with

manual transmission (M/T) disregard A/T-ECU and it’s wir-
ing circuits and measure between ABS-ECU and
ENGINE-ECU only.

CAUTION

Disconnect the negative battery terminal. For details refer
to

P.54C-4

.

(3) Disconnect the negative battery terminal.

(4) Measure the resistance between A/T- ECU connector

terminal 14 and body ground.

OK: 1 k

Ω or more

CAUTION

Strictly observe the specified wiring harness repair proce-
dure. For details refer to

P.54C-5

.

Q: Does the resistance measure 1 k

Ω or more?

YES : If the resistance measures 1 k

Ω or more, go to Step

45 .

NO : If the resistance measures less than 1 k

Ω, repair the

wiring harness between A/T- ECU connector and
ABS-ECU connector.

16DB402A

A-02 (GR)

CONNECTOR: A-02

A-02 HARNESS CONNECTOR:

16DB480A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

A/T

CONTROL

UNIT

16DB495A

B-19

TEST
HARNESS

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-179

STEP 45. Check the CAN_L line inside the ABS-ECU for
short to ground. Measure the resistance at ABS-ECU
connector A-02.

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 ABS-ECU connector A-02.

16DB402A

A-02 (GR)

CONNECTOR: A-02

A-02 HARNESS CONNECTOR:

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-180

(2) Measure the resistance at connector A-02, and use special

tool Inspection Check Harness (MB991219) to probe the
wiring harness-side connector.

NOTE: The special tool (Inspection test harness)
MB991219 for connector pin contact pressure should be
used. The test probe should never be forcibly inserted, as it
may cause a defective contact.

(3) Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION

Disconnect the negative battery terminal. For details refer
to

P.54C-4

.

(4) Disconnect the negative battery terminal.
(5) Measure the resistance between connector A-02 terminal

14 (using inspection test harness MB991219) 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, diagnose

CAN bus lines thoroughly by referring to

P.54C-323

.

NO : If the resistance measures less than 1 k

Ω, replace the

ABS-ECU.

16DB496A

CONNECTOR: A-02

TEST HARNESS

(MB991219)

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-181

STEP 46. Check the CAN_L line (communication line only)
between the ENGINE- ECU connector and A/T-ECU
connector for short to ground. Measure the resistance at
ENGINE- ECU connector B-21.

NOTE: When diagnosing CAN BUS on vehicles with

manual transmission (M/T) disregard A/T-ECU and it’s wir-
ing circuits and measure between ABS-ECU and
ENGINE-ECU only.

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

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 A/T-ECU

connector B-19, and measure the resistance at the harness
side of ENGINE- ECU connector B-21.

(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.

16DB480A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

A/T

CONTROL

UNIT

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER