Mitsubishi Galant (2004+). Manual - part 524

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-41

STEP 14. Check ABS-ECU connector A-02, intermediate
connector C-25 and wheel speed sensor <rear: LH>
connector F-07 for loose, corroded or damaged terminals,
or terminals pushed back in the connector.

Q: Are ABS-ECU connector A-02, intermediate connector

C-25 and wheel speed sensor <rear: LH> connector F-07
damaged?
YES : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. Then go to Step 16.

NO : Open or short circuit may be present in the rear left

wheel speed sensor circuit. Repair the wiring harness
between ABS-ECU connector A-02 (terminals 27 and
28) and rear left wheel speed sensor F-07 (terminals
2 and 1).Then go to Step 16.

AC306406

22 21 20

A-02 HARNESS CONNECTOR
(HARNESS SIDE)

A-02 (GR)

CONNECTOR: A-02

HYDRAULIC UNIT
(WITH BUILT-IN ABS-ECU)

AC305231BM

CONNECTOR: C-25

C-25

10
16

5 6

AC305260

CONNECTOR: F-07

F-07 HARNESS
CONNECTOR
(HARNESS SIDE)

1 2

F-07

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-42

STEP 15. Recheck for diagnostic trouble code.

Check again if the DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the DTC.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Turn the ignition switch to the "ON" position.
(5) Check if the DTC is set.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC C1201, C1206, C1211 or C1216 set?

YES : Replace the hydraulic unit (integrated with

ABS-ECU). Then go to Step 16.

NO : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-6

STEP 16. Recheck for diagnostic trouble code.

Check again if the DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the DTC.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Turn the ignition switch to the "ON" position.
(5) Check if the DTC is set.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC C1201, C1206, C1211 or C1216 set?

YES : Go to Step 1.
NO : The procedure is complete.

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-43

DTC C1226/C1231/C1236/C1241/C1246/C1251/C1256/C1261: ABS Solenoid Valve

CAUTION

If there is any problem in the CAN bus lines, an
incorrect diagnostic trouble code may be set.
Prior to this diagnosis, diagnose the CAN bus
lines.

CIRCUIT OPERATION

• The ABS-ECU contains the power supply circuit

(terminal 1) for the solenoid valve. The solenoid
valve is energized by the valve relay, which is
integrated in the ABS-ECU.

• The valve relay, which is integrated in the

ABS-ECU, is always energizing the solenoid
valve unless the initial check is in progress when
the ignition switch is turned on.

• The ABS-ECU activates the solenoid valve by

turning on its driving transistor.

ABS SOLENOID VALVE

HYDRAULIC UNIT

MOTOR

FUSIBLE
LINK

MOTOR
POWER
SUPPLY

SOLENOID
VALVE POWER
SUPPLY

ABS-ECU

AC308173

Solenoid Valve and Motor Power Supply Circuit

AC304742

A-02 (GR)

CONNECTOR: A-02

HYDRAULIC UNIT
(WITH BUILT-IN ABS-ECU)

AC305015AE

FUSIBLE LINK
No.3

RELAY BOX IN ENGINE COMPARTMENT

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-44

ABS DTC SET CONDITIONS
These diagnostic trouble codes will be set under the
cases below.

• The solenoid valve is not energized even after

the ABS-ECU has turned on the driving transistor
(Open circuit is present in the power supply cir-
cuit to the ABS-ECU solenoid valve, or the valve
relay has failed).

• The solenoid valve is not energized even after

the ABS-ECU has turned on the driving transistor
(Open circuit is present in the solenoid valve cir-
cuit inside the ABS-ECU, or the valve relay has
failed).

• After the ABS-ECU has turned off the driving

transistor, the solenoid valve still remains ener-
gized (short in the solenoid valve circuit).

• When a solenoid valve failure is detected

TROUBLESHOOTING HINTS (The most likely
causes for these DTCs are to set are:)

Current trouble

• Damaged wiring harness or connector

• Malfunction of the hydraulic unit (integrated with

ABS-ECU)

Past trouble

• Carry out diagnosis with particular emphasis on

connector(s) or wiring harness between the
power supply circuit (terminal 1) to the ABS-ECU
solenoid valve or ground circuit (terminal 2) . For
diagnosis procedures, refer to "How to cope with
past trouble" (Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

P.00-6

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

• MB991970: ABS Check Harness

STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.

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.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.

(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 3.
NO : Repair the CAN bus line (Refer to GROUP 54C,

Diagnosis

P.54C-14

). Then go to Step 2.

AC305412

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

Content .. 522 523 524 525 ..