Mitsubishi Outlander GS45X. Manual — part 386

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-165

Inspection Procedure 8: ABS-ECU power supply circuit system

IG1
RELAY

AC901471

ABS-ECU Power Supply Circuit

FUSIBLE
LINK

27

FUSIBLE
LINK

26

ETACS-
ECU

ABS-ECU

POWER
SOURCE

SOLENOID VALVE
POWER SOURCE

MOTOR POWER
SOURCE

FUSIBLE
LINK

34

IGNITION
SWITCH

AB

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-166

CAUTION

• When the ABS-ECU power supply voltage becomes 9.7

± 0.3 V or less, the ABS warning light illuminate, and

the ABS control is prohibited.

• If the battery terminal is not tightened properly, a dump

surge may occur and the power supply voltage may
become abnormally high for a short time.

.

OPERATION

• ABS-ECU contains the power supply circuit (terminal

No.26) for the solenoid valve. The solenoid valve is ener-
gized by the valve relay, which is incorporated in ABS-ECU.

• ABS-ECU contains the power supply circuit (terminal No.

13) for the pump motor. The pump motor is energized by
the motor relay, which is incorporated in ABS-ECU.

• ABS-ECU contains the power supply circuit (terminal No.7)

for ABS-ECU. When the ignition switch (IG1) is turned ON,
the voltage is applied to the relay incorporated in
ETACS-ECU to turn ON the relay, and the power is supplied
from fusible link No.34 through multi-purpose fuse No.12.

• When malfunction occurs in ABS-ECU power supply, the

communication with scan tool becomes unavailable.

.

AC901112

Connector: A-01

A-01 (B)

AE

AC901075 AB

Connector: C-33

AC900844AY

Connector: C-210

AC702828AG

C-309 (B)

C-317

Connectors: C-309, C-317

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-167

PROBABLE CAUSES

• Damaged wiring harness and connectors

• Malfunction of fuse and fusible link

• Improper tightening of battery terminal

• Improper tightening of ground bolt

• Battery failure

• Charging system failed

• Malfunction of ABS-ECU

DIAGNOSIS

Required Special Tools:

• MB991958 Scan Tool (M.U.T.-III Sub Assembly)

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

• MB991827 M.U.T.-III USB Cable

• MB991910 M.U.T.-III Main Harness A

• MB991974: ABS check harness

STEP 1. Battery check
Refer to GROUP 54A

− Battery Test

P.54A-9

.

Q: Is the battery in good condition?

YES : Go to Step 3.
NO : Charge or replace the battery. Then go to Step 2.

STEP 2. Charging system check
Refer to GROUP 16

− On−vehicle Service/Output Current Test

P.16-9

(3.0L engine).

Q: Is the charging system in good condition?

YES : Go to Step 3.
NO : Repair or replace the charging system component(s).

STEP 3. Connector check: A-01 ABS-ECU connector
Q: Is the check result normal?

YES : Go to Step 4.
NO : Repair the damaged connector.

STEP 4. Fusible link check: Check the fusible link No.27.
Q: Is the check result normal?

YES : Go to Step 6.
NO : Go to Step 5.

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-168

STEP 5. Resistance measurement at A-01 ABS-ECU
connector
(1) Disconnect the ABS-ECU connector, connect special tool

ABS check harness (MB991974) to the harness-side
connector, and then measure the resistance at the special
tool connector side.
NOTE: Do not connect the special tool ABS check harness
(MB991974) to ABS-ECU.

(2) Disconnect the fusible link No.27.
(3) Measure the resistance between the terminal No.26 and the

body ground.

OK: No continuity

Q: Is the check result normal?

YES : Replace the fusible link No.27. Then go to Step 27.
NO : The short circuit may be present in the power supply

circuit. Repair the wiring harness between the A-01
ABS-ECU connector terminal No.26 and the fusible
link No.27, and then replace the fusible link No.27.
Then go to Step 27.

STEP 6. Check the fusible link No.26.
Q: Is the check result normal?

YES : Go to Step 8.
NO : Go to Step 7.

AC606869 HM

ABS-ECU

MB991974

Check harness

A-01 ABS-ECU
harness connector