Mitsubishi Outlander XL. Manual - part 692

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

STEP 1. M.U.T.-III diagnostic trouble code

Q:Is any DTC set?

YES:

 Troubleshoot for the relevant diagnostic trouble

code.

NO:

 Go to Step 2.

STEP 2. Hydraulic unit (HU) check
Refer to P.35C-188.

Q:Is the check result normal?

YES:

 Go to Step 3.

NO:

 Repair the brake pipe or replace ASC-ECU.

STEP 3. Operation check

Q:Does  traction  control  function  or  skid  control  function

operate normally?

YES:

 The procedure is complete.

NO:

 Check the brake system related components except the

ASC.

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-175

DIAGNOSIS

Inspection Procedure 12: ASC-ECU Power Supply Circuit System

M13506100096USA0000010000

Solenoid Valve,Motor and ASC-ECU Power Supply Circuit

FUSIBLE
LINK

27

FUSIBLE
LINK

26

ETACS-
ECU

POWER
SOURCE

ASC-ECU

SOLENOID
VALVE
POWER
SOURCE

MOTOR
POWER
SOURCE

IGNITION
SWITCH

FUSIBLE
LINK

34

IG1
RELAY

SYSTEM OPERATION

｠

The ASC-ECU power supply signal energized by the ignition
switch (IG1) is transmitted to ASC-ECU (terminal No. 4) via
the multi-purpose fuse No.12.

｠

The ASC-ECU power supply and the valve power supply are
transmitted to ASC-ECU (terminal No. 32) via the fusible link
No. 27.

｠

When  malfunction  occurs  in  ASC-ECU  power  supply,  the
communication with scan tool becomes unavailable.

PROBABLE CAUSES

｠

Damaged wiring harness and connectors

35C-176

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS

｠

Battery failure

｠

Charging system failed

｠

ASC-ECU malfunction

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

｠

MB991997: ASC check harness

STEP 1. Voltage measurement at the A-02 ASC-ECU
connector

ZC601293 0012

ASC-ECU

MB991997

Check harness

A-02 ASC-ECU 
harness connector

(1)

Disconnect the connector, connect special tool MB991997 to
the harness-side connector, and measure the voltage at the
special tool connector side.

NOTE: 

Do not connect the special tool MB991997 to ASC-

ECU.

(2)

Turn the ignition switch to the ON position.

(3)

Measure  the  voltage  between  terminal  No.  4  and  body
ground.

OK: 12 volts (Battery voltage)

Q:Is the check result normal?

YES:

 Go to Step 2.

NO:

 Go to Step 6.

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-177

DIAGNOSIS

STEP 2. Voltage measurement at the A-02 ASC-ECU
connector

ZC601293 0008

ASC-ECU

MB991997

Check harness

A-02 ASC-ECU 
harness connector

(1)

Disconnect the connector, connect special tool MB991997 to
the harness-side connector, and measure the voltage at the
special tool connector side.

NOTE: 

Do not connect the special tool MB991997 to ASC-

ECU.

(2)

Turn the ignition switch to the ON position.

(3)

Measure the voltage between the terminal No. 32 and the
body ground.

OK: 12 volts (Battery voltage)

Q:Is the check result normal?

YES:

 Go to Step 4.

NO:

 Go to Step 3.

STEP 3. Connector check: A-02 ASC-ECU connector

Q:Is the check result normal?

YES:

 Repair the wiring harness between the fusible link

No. 27 and the A-02 ASC-ECU connector terminal No. 32.

NO:

 Repair the defective connector.

35C-178

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS