Mitsubishi Galant (2004+). Manual — part 522

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-33

STEP 3. Using scan tool MB991958, read the diagnostic
trouble code.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
Use scan tool MB991958 to check whether DTC codes C1200,
C1205, C1210 and C1215 have been set simultaneously.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check whether DTC C1200, C1205, C1210 or C1215 have

been set.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC C1200, C1205, C1210 or C1215 set?

YES : Carry out diagnosis relevant to DTC C1200, C1205,

C1210 or C1215 (Refer to

P.35B-13

).

NO : Go to Step 4.

STEP 4. Check the installation condition of the wheel
speed sensors.

For the wheel speed sensor, which the DTC code indicates,
check whether the sensor or its mounting bolts are loosened.

• DTC C1201 is set: Front right wheel speed sensor

• DTC C1206 is set: Front left wheel speed sensor

• DTC C1211 is set: Rear right wheel speed sensor

• DTC C1216 is set: Rear left wheel speed sensor

Q: Is the wheel speed sensor installed correctly?

YES : Go to Step 5.
NO : Reinstall the wheel speed sensor correctly. Then go

to Step 16.

STEP 5. Check the wheel speed sensor after it is removed
from the vehicle.

Check the wheel speed sensor which the DTC code indicates
(Refer to

P.35B-113

).

• DTC C1201 is set: Front right wheel speed sensor

• DTC C1206 is set: Front left wheel speed sensor

• DTC C1211 is set: Rear right wheel speed sensor

• DTC C1216 is set: Rear left wheel speed sensor

Q: Is the wheel speed sensor in good condition?

YES : Go to Step 6.
NO : Replace the wheel speed sensor (Refer to

P.35B-112

). Then go to Step 16.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

35B-34

STEP 6. Check the wheel bearing for looseness.
NOTE: If the wheel bearing is loose, the gap between the
wheel speed sensor and rotor may become excessive. Check
the wheel bearing, which DTC code indicates, for looseness.

• DTC C1201 is set: Check the front right wheel bearing

(Refer to GROUP 26, On-vehicle service

− Wheel bearing

end play check

P.26-8

).

• DTC C1206 is set: Check the front left wheel bearing (Refer

to GROUP 26, On-vehicle service

− Wheel bearing end play

check

P.26-8

).

• DTC C1211 is set: Check the rear right wheel bearing

(Refer to GROUP 27, On-vehicle service

− Wheel bearing

end play check

P.27-4

).

• DTC C1216 is set: Check the rear left wheel bearing (Refer

to GROUP 27, On-vehicle service

− Wheel bearing end play

check

P.27-4

)

Q: Is the wheel bearing end play within the standard value?

YES : Go to Step 7.
NO (front bearing end play is not within the standard
value) : Replace the front hub assembly (Refer to GROUP

26, Front axle hub assembly

P.26-9

).

NO (rear bearing end play is not within the standard
value) : Replace the rear hub assembly (Refer to GROUP

27, Rear axle hub assembly

P.27-4

).

STEP 7. Check the wheel speed rotor.

Check the wheel speed rotor, which DTC code indicates, for
foreign material or deformation.

• DTC C1201 is set: Front right wheel speed sensor

• DTC C1206 is set: Front left wheel speed sensor

• DTC C1211 is set: Rear right wheel speed sensor

• DTC C1216 is set: Rear left wheel speed sensor

Q: Is the wheel speed rotor in good condition?

YES : Go to Step 8.
NO (front bearing end play is not within the standard
value) : If the wheel speed rotor is contaminated with

foreign material, clean it. If the driveshaft is
deformed, replace it (Refer to GROUP 26, Drive shaft
assembly

P.26-13

).

NO (rear bearing end play is not within the standard
value) : If the wheel speed rotor is contaminated with

foreign material, clean it. If the wheel speed rotor is
deformed, replace it (Refer to GROUP 27, Rear axle
hub assembly

P.27-6

).

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

35B-35

STEP 8. Measure the voltage at ABS-ECU connector A-02.

(1) Disconnect the connector A-02, and connect special tool

ABS Check Harness (MB991970) to the wiring
harness-side connector.
NOTE: Do not connect special tool ABS Check Harness
(MB991970) to the ABS-ECU.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between the relevant signal and

ground terminals in the wheel speed sensor circuit and
body ground. It should be less than 1V.

• DTC C1201 is set: Between signal terminal 9 and body

ground, and between ground terminal 10 and body
ground

• DTC C1206 is set: Between signal terminal 26 and body

ground, and between ground terminal 16 and body
ground

• DTC C1211 is set: Between signal terminal 11 and body

ground, and between ground terminal 17 and body
ground

• DTC C1216 is set: Between signal terminal 28 and body

ground, and between ground terminal 27 and body
ground

Q: Does the voltage measure 1 V or less?

YES : Go to Step 9.
NO (When the voltage between terminal 9 or 10

− and

body ground measures more than 1 V) : Go to Step 11.
NO (When the voltage between terminal 26 or 16

− and

body ground measures more than 1 V) : Go to Step 12.
NO (When the voltage between terminal 11 or 17

− and

body ground measures more than 1 V) : Go to Step 13.
NO (When the voltage between terminal 28 or 27

− and

body ground measures more than 1 V) : Go to Step 14.

AC306403

19

2

18

1

8

9

7

6

5

4

3

10

11

25

15

16

17

27

28

26

12

13

14

23

24

22 21 20

AB

ABS-ECU

MB991970

CHECK CONNECTOR

A-02 HARNESS
CONNECTOR

A-02 (GR)

CONNECTOR: A-02

HYDRAULIC UNIT
(WITH BUILT-IN ABS-ECU)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-36

STEP 9. Measure the resistance at ABS-ECU connector
A-02.

(1) Disconnect the connector A-02, and connect special tool

ABS Check Harness (MB991970) to the wiring
harness-side connector.
NOTE: Do not connect special tool ABS Check Harness
(MB991970) to the ABS-ECU.

(2) Measure the resistance between the relevant signal and

ground terminals in the wheel speed sensor circuit and
body ground. OK if there is no continuity.

• DTC C1201 is set: Between signal terminal 9 and body

ground, and between ground terminal 10 and body
ground

• DTC C1206 is set: Between signal terminal 26 and body

ground, and between ground terminal 16 and body
ground

• DTC C1211 is set: Between signal terminal 11 and body

ground, and between ground terminal 17 and body
ground

• DTC C1216 is set: Between signal terminal 28 and body

ground, and between ground terminal 27 and body
ground

Q: Does continuity exist?

YES (Continuity exists between terminal 9 or terminal 10
and body ground) : Go to Step 11.
YES (Continuity exists between terminal 26 or terminal
16 and body ground) : Go to Step 12.
YES (Continuity exists between terminal 11 or terminal
17 and body ground) : Go to Step 13.
YES (Continuity exists between terminal 28 or terminal
27 and body ground) : Go to Step 14.
NO : Go to Step 10.

AC306403

19

2

18

1

8

9

7

6

5

4

3

10

11

25

15

16

17

27

28

26

12

13

14

23

24

22 21 20

AC

ABS-ECU

MB991970

CHECK CONNECTOR

A-02 HARNESS
CONNECTOR

A-02 (GR)

CONNECTOR: A-02

HYDRAULIC UNIT
(WITH BUILT-IN ABS-ECU)