Mitsubishi 380. Manual - part 671

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-95

STEP 13. Check A/C-ECU connector C-15 automatic air
conditioning system for loose, corroded or damaged
terminals, or terminals pushed back in the connector.

• Refer to circuit diagrams GROUP-

• Refer to configuration diagrams GROUP-

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 A/C-ECU connector C-15 automatic air conditioning

system in good condition?
YES : Go to Step 14.
NO : Repair the damaged parts.

16DB477A

C-15 HARNESS SIDE

CONNECTOR: C-15

C-15 (B)

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-96

STEP 14. Check the CAN_H 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.

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-97

(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

AC209365GD

HARNESS SIDE: C-02

TEST
HARNESS

16DB408A

CONNECTOR: C-02

AC209365

AC209365FU

HARNESS SIDE: C-02

TEST
HARNESS

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-98

STEP 16. 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 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