Mitsubishi 380. Manual - part 659

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-47

(3) Measure the voltage between joint connector (3) terminal 

17 and body ground.

OK: 1.0 V or less

CAUTION

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

P.54C-5

.

Q: Does the voltage measure 1.0 V or less?

YES : If the voltage measures 1.0 V or less, diagnose CAN 

bus lines thoroughly by referring to 

P.54C-323

.

NO :  If the voltage measures more than 1.0 V, repair the 

wiring harness between joint connector (3) and the 
A/C-ECU connector.

STEP 15. Check the CAN_H line (communication line 
including the SRS-ECU) between joint connector (3) and 
the SRS-ECU connector for short to the power supply. 
Measure the voltage at joint connector (3) C-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 joint connector (3) C-02, and measure the 

voltage at the wiring harness side of joint connector (3) 
C-02.

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

(3) Measure the voltage between joint connector (3) terminal 3 

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 18.
NO :  If the voltage measures more than 4.0 V, go to Step 

16.

AC209365

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AC209365

AC209365GD

HARNESS SIDE: C-02

TEST 
HARNESS

16DB408A

CONNECTOR: C-02

AC209365

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AC209365FU

HARNESS SIDE: C-02

TEST 
HARNESS

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-48

STEP 16. Check SRS-ECU connector C-121 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

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 SRS-ECU connector C-121 in good condition?

YES : Go to Step 17.
NO :  Repair the damaged parts.

STEP 17. Check the CAN_ H line (communication line only) 
between the SRS-ECU connector and the joint connector 
for a short circuit. Measure the voltage at joint connector 
C-03.

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 C-03 and SRS-ECU connector 

C-121, and measure the voltage at joint connector C-03.

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

(3) Measure the voltage between joint connector terminal 3 and 

body ground.

OK: 1.0 V or less

CAUTION

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

P.54C-5

.

Q: Does the voltage measure 1.0 V or less?

YES : If the voltage measures 1.0 V or less, diagnose CAN 

bus lines thoroughly by referring to 

P.54C-323

.

NO :  If the voltage measures more than 1.0 V, repair the 

wiring harness between joint connector C-03 and 
SRS-ECU connector C-121.

16DB478A

CONNECTOR: C-121

HARNESS SIDE

C-121 (Y)

48

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22

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24

25

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29

30

31

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34

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38

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42

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46

47

16DB408A

CONNECTOR: C-02

AC209365

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AC209365FU

HARNESS SIDE: C-02

TEST 
HARNESS

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-49

STEP 18. Check the CAN_H line (communication line only) 
between joint connector (3) and the data link connector for 
a short to the power supply. Measure the voltage at joint 
connector (3) C-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 joint connector (3) C-02, and measure the 

voltage at the wiring harness side of joint connector (3) 
C-02.

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

(3) Measure the voltage between joint connector (3) terminal 7 

and body ground.

OK: 1.0 V or less

CAUTION

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

P.54C-5

.

Q: Does the voltage measure 1.0 V or less?

YES : If the voltage measures 1.0 V or less, go to Step 19.
NO :  If the voltage measures more than 1.0 V, repair the 

wiring harness between joint connector (3) and the 
data link connector.

16DB408A

CONNECTOR: C-02

AC209365

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AC209365FW

HARNESS SIDE: C-02

TEST HARNESS

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-50

STEP 19. Check the CAN_H line (communication line only) 
between intermediate connector C-29 and joint connector 
(3) for a short to the power supply. Measure the voltage at 
joint connector (3) C-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 intermediate connector C-29 and joint 

connector (3) C-02, and measure the voltage at the wiring 
harness side of joint connector (3) C-02.

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

(3) Measure the voltage between joint connector (3) terminal 9 

and body ground.

OK: 1.0 V or less

CAUTION

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

P.54C-5

.

Q: Does the voltage measure 1.0 V or less?

YES : If the voltage measures 1.0 V or less, diagnose CAN 

bus lines thoroughly by referring to 

P.54C-323

.

NO :  If the voltage measures more than 1.0 V, repair the 

wiring harness between intermediate connector C-29 
and joint connector (3).

16DB479A

CONNECTORS: C-02, C-29

C-02

C-02

C-29

C-29

AC209365

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AC209365FY

HARNESS SIDE: C-02

TEST HARNESS