Mitsubishi Galant (2004+). Manual — part 358

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-43

STEP 11. Check the CAN_H line (communication line only)
between joint connector (3) and ETACS-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 ETACS-ECU

connector C-218, 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 5

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-465

.

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

wiring harness between joint connector (3) and the
ETACS-ECU connector.

AC305231AP

CONNECTOR: C-02

AC305413

C-218 (GR)

CONNECTOR: C-218

AI

HARNESS SIDE

JUNCTION BLOCK
(REAR VIEW)

68

74

63

66

72

73

67

65 64

61

70

71

62

69

60

57

58

59

56 55

52

54 53

51

AC209365

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

AC209365

AC209365

HARNESS SIDE: C-02

TEST HARNESS

FR

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-44

STEP 12. Check the CAN_H line (communication line
including the A/C-ECU) between joint connector (3) and
the 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 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 6

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 15.
NO : If the voltage measures more than 4.0 V, go to Step

13.

AC305231AP

CONNECTOR: C-02

AC209365

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

AC209365

AC209365

HARNESS SIDE: C-02

FS

TEST HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-45

STEP 13. Check A/C-ECU connector C-10 <manual air
conditioning system (low)> or C-15 <manual air
conditioning system (middle) or automatic air conditioning
system> 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 A/C-ECU connector C-10 <manual air conditioning

system (low)> or C-15 <manual air conditioning system
(middle) or automatic air conditioning system> in good
condition?
YES : Go to Step 14.
NO : Repair the damaged parts.

AC305234AB

C-10 HARNESS SIDE

C-15 HARNESS SIDE

CONNECTORS: C-10, C-15

C-10 (B)

C-15 (B)

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-46

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-10 <manual air conditioning system (low)> or
C-15 <manual air conditioning system (middle) or 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.

AC305231AP

CONNECTOR: C-02

AC305234AB

C-10 HARNESS SIDE

C-15 HARNESS SIDE

CONNECTORS: C-10, C-15

C-10 (B)

C-15 (B)