Mitsubishi Galant 9G. Manual — part 1337

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-452

STEP 9. Check the CAN bus lines (communication line
only) between ABS-ECU and the powertrain control
module. Measure the resistance between ABS-ECU
connector A-02 and powertrain control module connector
B-19.

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 ABS-ECU connector A-02 and powertrain

control module connector B-19, and measure the resistance
between each wiring harness side connector.

(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.

AC305206

CONNECTOR: A-02

AG

A-02 (GR)

HARNESS SIDE

AC306248AD

B-19 (B)

CONNECTOR: B-19

PCM

AIR
CLEANER

HARNESS SIDE

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-453

(4) Measure the resistance between ABS-ECU connector

terminal 23 and powertrain control module connector
terminal 18.

OK: 2 ohms or less

(5) Measure the resistance between joint connector (3)

terminal 24 and powertrain control module connector
terminal 17.

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, go to

Step 10.

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 (3) and the powertrain control module
connector.

AC204582

HARNESS SIDE: A-02

HARNESS SIDE: B-19

TEST
HARNESS

TEST
HARNESS

3

17

10

13

18

4

11

14

7

16 15

1

2

5

12

9

6

8

JAE

19

18

2

1

25

8

15

16

17

27

28

26

11

9

10

12

13

14

23

24

22 21

7

6

5

4

20

3

CU

AC204582

3

17

10

13

18

4

11

14

7

16 15

1

2

5

12

9

6

8

JAE

19

18

2

1

25

8

15

16

17

27

28

26

11

9

10

12

13

14

23

24

22 21

7

6

5

4

20

3

HARNESS SIDE: A-02

HARNESS SIDE: B-19

TEST
HARNESS

TEST
HARNESS

CT

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-454

STEP 10. Check the terminator resistor inside the
powertrain control module. Measure the resistance at
powertrain control module connector B-19.

CAUTION

A digital multimeter should be used. For details refer to

P.54C-4

.

(1) Disconnect powertrain control module connector B-19, and

measure the resistance at the component side of
powertrain control module connector B-19.

(2) Measure the resistance between powertrain control module

connector terminals 17 and 18.

OK: 120

± 20 Ω

Q: Does the resistance measure 120

± 20 Ω?

YES : If the resistance measures 120

± 20 Ω, go to Step 11.

NO : If the resistance does not measure 120

± 20 , replace

the powertrain control module.

AC306248AD

B-19 (B)

CONNECTOR: B-19

PCM

AIR
CLEANER

HARNESS SIDE

AC209438

AC209438

AC209438

AC209438

COMPONENT SIDE: B-19

BD

TEST
HARNESS

TEST
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-455

STEP 11. Check the CAN bus lines inside the ABS-ECU.
Measure the resistance at ABS-ECU connector A-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 ABS-ECU connector A-02, and measure the

resistance at the component side of ABS-ECU connector
A-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.

(4) Measure the resistance between ABS-ECU connector

terminals 7 and 23.

OK: 2 ohms or less

(5) Measure the resistance between ABS-ECU connector

terminals 24 and 25.

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 the voltage measures 2 V or less, diagnose CAN

bus lines thoroughly by referring to

P.54C-486

<Vehicles without multi-center display (middle-grade
type)> or

P.54C-520

<Vehicles with multi-center

display (middle-grade type)>.

NO : Replace the ABS-ECU.

AC305206

CONNECTOR: A-02

AG

A-02 (GR)

HARNESS SIDE

AC209438

COMPONENT SIDE: A-02

TEST
HARNESS

AC

TEST
HARNESS

AC209438

COMPONENT SIDE: A-02

AD

TEST
HARNESS

TEST
HARNESS