Mitsubishi Galant (2004+). Manual - part 518

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-17

STEP 4. 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 5.
NO (When the voltage between terminal 9 or 10 

− and 

body ground measures more than 1 V) : Go to Step 7.
NO (When the voltage between terminal 26 or 16 

− and 

body ground measures more than 1 V) : Go to Step 9.
NO (When the voltage between terminal 11 or 17 

− and 

body ground measures more than 1 V) : Go to Step 11.
NO (When the voltage between terminal 28 or 27 

− and 

body ground measures more than 1 V) : Go to Step 13.

AC306403

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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-18

STEP 5. 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. There should be 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 7.
YES (Continuity exists between terminal 26 or terminal 
16 and body ground) : Go to Step 9.
YES (Continuity exists between terminal 11 or terminal 
17 and body ground) : Go to Step 11.
YES (Continuity exists between terminal 28 or terminal 
27 and body ground) : Go to Step 13.
NO :  Go to Step 6.

AC306403

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AC

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-19

STEP 6. Measure the resistance at the 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 ABS-ECU connector 

terminals.

• DTC C1200 is set: Between terminal 9 and terminal 10

• DTC C1205 is set: Between terminal 26 and terminal 16

• DTC C1210 is set: Between terminal 11 and terminal 17

• DTC C1215 is set: Between terminal 28 and terminal 27

Standard Value: 1.24 

− 1.64 kΩ

Q: Is the resistance between terminals 16 and 26, 9 and 10, 

27 and 28, or 11 and 17 within the standard value?
YES (When resistances between all terminals are within 
the standard value) : Go to Step 16.
NO (When resistance between terminals 9 and 10 is not 
within the standard value) : Go to Step 7.
NO (When resistance between terminals 16 and 26 is not 
within the standard value) : Go to Step 9.
NO (When resistance between terminals 11 and 17 is not 
within the standard value) : Go to Step 11.
NO (When resistance between terminals 27 and 28 is not 
within the standard value) : Go to Step 13.

AC306403

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AD

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-20

STEP 7. Check ABS-ECU connector A-02 and wheel speed 
sensor <front: RH> connector A-01 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.

Q: Are ABS-ECU connector A-02 and wheel speed sensor 

<front: RH> connector A-01 damaged?
YES : Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Then go to Step 17.

NO :  Go to Step 8.

AC306406

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A-02 HARNESS CONNECTOR
(HARNESS SIDE)

AB

A-02 (GR)

CONNECTOR: A-02

HYDRAULIC UNIT
(WITH BUILT-IN ABS-ECU)

AC305206

A-01 (B)

CONNECTOR: A-01

AV

A-01 HARNESS
CONNECTOR
(HARNESS SIDE)

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