Mitsubishi 380. Manual - part 747

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-399

STEP 2. Check joint connector (3) C-02 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

.

Check the joint connector at the wiring harness side for loose, 
corroded or damaged terminals, or terminals pushed back in 
the connector, and also check the short pin behind the connec-
tor for corrosion, deformation and delamination.

Q: Is joint connector (3) C-02 in good condition?

YES : Go to Step 3.
NO :  Repair the damaged parts. Replace the joint 

connector as necessary.

16DB408A

CONNECTOR: C-02

AC209350

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AB

SHORT PIN

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-400

STEP 3. Check the CAN bus lines between joint connector 
C-02 and the SRS-ECU. Measure the resistance between 
joint connector C-02 and SRS-ECU connector C-121.

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-02 and SRS-ECU connector 

C-121, and measure the resistance between the wiring 
harness sides of SRS-ECU connector C-121 and the joint 
connector C-02.

(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.

16DB408A

CONNECTOR: C-02

16DB478A

CONNECTOR: C-121

HARNESS SIDE

C-121 (Y)

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DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-401

(4) Measure the resistance between joint connector C-02 

terminal 14 and SRS-ECU connector C-121  terminal 43.

OK: 2 ohms or less

(5) Measure the resistance between joint connector C-02 

terminal 3 and SRS-ECU connector C-121 terminal 32.

OK: 2 ohms or less

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, power 

supply to the SRS-ECU may be suspected. Diagnose 
the supplemental restraint system. Refer to GROUP 
52B, SRS air bag diagnosis 

P.52B-18

.

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 joint 
connector C-02 and the SRS-ECU connector C-121.

16DB523A

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TEST 
HARNESS

TEST 
HARNESS

HARNESS SIDE: C-02

HARNESS SIDE: C-121

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16DB522A

HARNESS SIDE: C-02

TEST 
HARNESS

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TEST 
HARNESS

HARNESS SIDE: C-121

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DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-402

DIAGNOSTIC ITEM 16: Failure in the lines between CAN main bus line and the combination meter.

CAUTION

When servicing a CAN bus line, ground yourself 
by touching a metal object such as an unpainted 
water pipe. If you fail to do so, a component con-
nected to the CAN bus line may be damaged.

.

TROUBLE JUDGMENT

If the MUT-III cannot received signals from the com-
bination meter, CAN bus line connector(s) are bro-
ken or an open circuit has occurred.

.

COMMENTS ON TROUBLE SYMPTOM

The wiring harness wire or connectors may have 
loose, corroded, or damage terminals, or terminals 
pushed back in the connector, or the combination 
meter may be defective.

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• The wiring harness or connectors may have 

loose, corroded, or damage terminals, or termi-
nals pushed back in the connector

• The combination meter may be defective

16DB476A

 

HARNESS SIDE

C-101

CONNECTORS: C-02, C-101

C-02

C-02

C-101