Mitsubishi Outlander XL. Manual - part 673

PROBABLE CAUSES

Current trouble

｠

Fusible link malfunction

｠

Damaged wiring harness and connectors

｠

Abnormality in battery or generator

｠

ASC-ECU malfunction

Past trouble

｠

Carry  out  diagnosis  with  particular  emphasis  on  wiring
harness  and  connector  failures  between  the  power  supply
circuit (A-02 ASC-ECU connector terminal No. 1) to the ASC-
ECU motor and the ground circuit (A-02 ASC-ECU connector
terminal No. 47). For diagnosis procedures, refer to How to
treat past trouble (Refer to GROUP 00 - How to Cope with
Intermittent Malfunction P.00-15).

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. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.

Q:Is the check result normal?

YES:

 Go to Step 3.

NO:

 Repair the CAN bus lines. (Refer to GROUP 54D - CAN

Bus Diagnostics table P.54D-17.) On completion, go to
Step 2.

STEP 2. Check whether the diagnostic trouble code is reset.

Q:Is DTC C1073 set?

YES:

 Go to Step 3.

NO:

 The procedure is complete.

STEP 3. Fusible link check: Check the fusible link No. 26.

Q:Is the check result normal?

YES:

 Go to Step 4.

NO:

 Replace the fusible link No. 26.

STEP 4. Battery check
Refer to GROUP 54Aa - Battery Test P.54Aa-3.

Q:Is the battery in good condition?

YES:

 Go to Step 5.

NO:

 Charge or replace the battery.

STEP 5. Charging system check
Refer to GROUP 16a - Output Current Test P.16a-8.

Q:Is the charging system in good condition?

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-99

DIAGNOSIS

YES:

 Go to Step 6.

NO:

 Repair or replace the charging system component(s).

STEP 6. Voltage measurement at the A-02 ASC-ECU
connector

ZC601293 0010

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. 1 and the body
ground.

OK: 12 volts (Battery voltage)

Q:Is the check result normal?

YES:

 Go to Step 8.

NO:

 Go to Step 7.

STEP 7. Connector check: A-02 ASC-ECU connector

Q:Is the check result normal?

YES:

 The open or short circuit may be present in the

solenoid valve power supply circuit. Repair the wiring
harness between the A-02 ASC-ECU connector terminal No. 1
and the fusible link No. 26.

NO:

 Repair the defective connector.

35C-100

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS

STEP 8. Resistance measurement at A-02 ASC-ECU
connector

ZC601293 0011

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)

Resistance between terminal No. 47 and body ground

OK: Continuity exists (2 ohms or less)

Q:Is the check result normal?

YES:

 Go to Step 10.

NO:

 Go to Step 9.

STEP 9. Connector check: A-02 ASC-ECU connector

Q:Is the check result normal?

YES:

 An open circuit may be present in the ground

circuit. Repair the wiring harness between the A-02 ASC-
ECU terminal No. 47 and the body ground.

NO:

 Repair the defective connector.

STEP 10. Check whether the diagnostic trouble code is
reset.

(1)

Erase the diagnostic trouble code.

(2)

Drive the vehicle at 12mph (20 km/h) or more.

NOTE: 

The ABS warning light does not turn OFF in some

cases unless the vehicle runs at 12mph (20 km/h) or
higher.

Q:Is DTC C1073 set?

YES:

 Replace the ASC-ECU.

NO:

 Intermittent malfunction. (Refer to GROUP 00 - How

to Cope with Intermittent Malfunction P.00-15.)

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-101

DIAGNOSIS

DTC C2116: Abnormality in power supply voltage in pump motor

M13506100044USA0000010001

Solenoid Valve and Motor Power Supply Circuit

FUSIBLE
LINK

27

FUSIBLE
LINK

26

ASC-ECU

SOLENOID
VALVE
POWER
SOURCE

MOTOR
POWER
SOURCE

MOTOR 
POWER
SOURCE

SOLENOID
VALVE 
POWER
SOURCE

SOLENOID VALVE

HYDRAULIC UNIT

MOTOR

16

47

GND

GND

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. (Refer to GROUP 54D, Trouble
code diagnosis P.54D-17).

CIRCUIT OPERATION

｠

ASC-ECU contains the power supply circuit (terminal No. 1)
for the pump motor. The pump motor is energized by the motor
switch, which is incorporated in ASC-ECU.

｠

The pump motor switch, which is incorporated in ASC-ECU,
is  always  off  unless  the  motor  and  solenoid  valve  check  is
activated when the vehicle is started.

｠

ASC-ECU activates the pump motor by turning on the ECU
built-in pump motor switch.

DTC SET CONDITIONS
This diagnostic trouble codes will be set under the cases below:

｠

When the power supply voltage of the pump motor, which is
not in operation, is abnormally low for a prolonged period

35C-102

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS