Mitsubishi 380. Manual - part 677

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-119

STEP 39. Check the CAN_L line (communication line only) 
between joint connector (3) and A/C-ECU connector for a 
short to the power supply. Measure the voltage at joint 
connector (3) C-02.

• 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 joint connector (3) C-02 and A/C-ECU 

connector C-15 automatic air conditioning system, and 
measure the voltage at the wiring harness side of joint 
connector (3) C-02.

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

16DB408A

CONNECTOR: C-02

16DB477A

C-15 HARNESS SIDE

CONNECTOR:  C-15

C-15 (B)

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-120

(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 40. Check the CAN_L 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 

14 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 43.
NO :  If the voltage measures more than 4.0 V, go to Step 

41.

AC209365

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AC209365

AC209365GD

HARNESS SIDE: C-02

TEST 
HARNESS

16DB408A

CONNECTOR: C-02

AC209365

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AC209365

AC209365GE

HARNESS SIDE: C-02

TEST 
HARNESS

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-121

STEP 41. Check SRS-ECU connector C-121 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: Is SRS-ECU connector C-121 in good condition?

YES : Go to Step 42.
NO :  Repair the damaged parts.

STEP 42. Check the CAN_L line (communication line only) 
between the SRS-ECU connector and joint connector (3) 
for a short to the power supply. Measure the voltage at 
joint connector (3) C-02.

• 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 joint connector (3) C-02 and SRS-ECU 

connector C-121, 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) C-02 

terminal 14 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) C-02 and 
SRS-ECU connector C-121.

16DB478A

CONNECTOR: C-121

HARNESS SIDE

C-121 (Y)

48

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47

16DB478A

CONNECTOR: C-121

HARNESS SIDE

C-121 (Y)

48

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AC209365

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AC209365

AC209365GE

HARNESS SIDE: C-02

TEST 
HARNESS

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-122

STEP 43. Check the CAN_L line (communication line 
including the multi-center display unit ) between joint 
connector (3) and middle-grade multi-center display 
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 

19 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 46.
NO :  If the voltage measures more than 4.0 V, go to Step 

44.

STEP 44. Check multi-center display unit  connector C-05 
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: Is multi-center display unit  connector C-05 in good 

condition?
YES : Go to Step 45.
NO :  Repair the damaged parts.

16DB408A

CONNECTOR: C-02

AC209365

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AC209365

AC209365FV

HARNESS SIDE: C-02

TEST HARNESS

16DB490A

CONNECTOR: C-05

HARNESS SIDE

C-05 (B)