Mitsubishi 380. Manual - part 725

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-311

STEP 8. Check the CAN bus lines between the ABS-ECU, 
A/T-ECU and the ENGINE-ECU (communication line 
including the ENGINE-ECU). Measure the resistance at 
ABS-ECU connector A-02.

NOTE: when diagnosing CAN-BUS on vehicles with 
manual transmission (M/T), disregard A/T-ECU and it’s wir-
ing circuits and check 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 ABS-ECU connector A-02, and measure the 

resistance at the wiring harness side of ABS-ECU 
connector A-02.

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

position

CAUTION

Disconnect the negative battery terminal. For details refer 
to 

P.54C-4

.

(3) Disconnect the negative battery terminal.

(4) Measure the resistance between ABS-ECU connector 

terminals 15 and 26.

OK: 120 

± 20 Ω

Q: Does the resistance measure 120 

± 20 Ω?

YES : If the resistance measures 120 

± 20 Ω, diagnose CAN 

bus lines thoroughly by referring to 

P.54C-323

 

<Vehicles with multi-center display >.

NO :  If the resistance does not measure 120 

± 20 Ω, go to 

Step 9 .

16DB402A

A-02 (GR)

CONNECTOR: A-02 

A-02 HARNESS CONNECTOR:

16DB506A

TEST
HARNESS

TEST

HARNESS

HARNESS SIDE:  A-02

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-312

STEP 9. Check the CAN bus lines (communication line 
only) between ABS-ECU and the A/T-ECU. Measure the 
resistance between ABS-ECU connector A-02 and A/T-ECU 
connector B-19.

NOTE: when diagnosing CAN-BUS on vehicles with 
manual transmission (M/T), disregard A/T-ECU and it’s wir-
ing circuits and check between ABS-ECU and 
ENGINE-ECU only.

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

.

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-313

(1) Disconnect ABS-ECU connector A-02 and A/T-ECU 

connector B-19, and measure the resistance between each 
wiring harness side connector.

(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

16DB402A

A-02 (GR)

CONNECTOR: A-02 

A-02 HARNESS CONNECTOR:

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-314

(4) Measure the resistance between ABS-ECU connector 

terminal 15 and A/T-ECU B-19 connector terminal 14.

OK: 2 ohms or less

(5) Measure the resistance between ABS-ECU connector 

terminal 26 and A/T-ECU B-19 connector terminal 13.

OK: 2 ohms or less

NOTE: when diagnosing CAN-BUS on vehicles with 
manual transmission (M/T), disregard A/T-ECU and it’s wir-
ing circuits and check between ABS-ECU and 
ENGINE-ECU only.

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, go to 

Step 10.

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 ABS-ECU 
connector and the A/T-ECU connector B-19. 

16DB507A

HARNESS SIDE: A-02

HARNESS SIDE: B-19

TEST 
HARNESS

TEST 
HARNESS

16DB508A

HARNESS SIDE: A-02

HARNESS SIDE: B-19

TEST 
HARNESS

TEST 
HARNESS