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Mitsubishi Outlander GS45X. Manual - part 452

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-235

CAUTION

• If there is any problem in the CAN bus lines, an incor-

rect diagnostic trouble code may be set. Prior to this
diagnosis, diagnose the CAN bus lines (Refer to
GROUP 54C

− CAN Bus Line Diagnostic Flow

P.54C-10

• Whenever ECU is replaced, ensure that the CAN bus

lines are normal.

• When the hydraulic unit (integrated with ASC-ECU) is

replaced, always carry out the calibration of the steer-
ing wheel sensor, the G and yaw rate sensor and brake
fluid pressure sensor (Refer to

P.35C-282

P.35C-283

and

P.35C-284

OPERATION

• ASC-ECU sends the illumination request signal of ASC

OFF display to the combination meter through ETACS-ECU
via CAN communication.

• By the operation of ASC OFF switch, the ASC OFF display

illuminates when the ASC function is stopped.

• When the ASC OFF switch is pressed for 3 seconds or

more, the ASC system turns OFF.

• When the ASC OFF switch is pressed for 15 seconds or

more, the ASC is kept in ON state.

TECHNICAL DESCRIPTION (COMMENT)

This may be caused by faults in the CAN bus line,
ETACS-ECU, combination meter or ASC-ECU.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• ETACS-ECU malfunction

• Combination meter malfunction

• ASC-ECU malfunction

• ASC OFF switch malfunction

DIAGNOSIS

Required Special Tools:

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

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

AC901075BF

Connectors: C-32, C-101

C-32

C-101

AC702828 AO

Connector: C-313

C-313 (BR)

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-236

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus
lines.
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?

YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP 54C

−

CAN Bus Diagnostics Table

P.54C-17

). Then go to

Step 10.

STEP 2. Using scan tool MB991958, check the DTC
Use scan tool to check the DTC for the ASC system.
Q: Is the DTC set?

YES : Carry out the diagnosis for the DTC (Refer to

P.35C-18

NO : Go to Step 3.

STEP 3. Actuator test of combination meter
Perform the following actuator test by the combination meter
system, and check if the ASC OFF display or light illuminates
normally (Refer to GROUP 54A

− Combination Meter/Actuator

Test Table

P.54A-91

• Item No.7: Indicator 1

Q: Is the check result normal?

YES : Go to Step 4.
NO : Replace the combination meter (Refer to GROUP

54A

− Combination Meter

P.54A-118

). Then go to

Step 9.

STEP 4. ASC OFF switch check
Refer to

P.35C-286

Q: Is the check result normal?

YES : Go to Step 5.
NO : Replace ASC OFF switch (Refer to

P.35C-285

). Then

go to Step 10.

STEP 5. Connector check: C-313 ETACS-ECU connector,
C-32 intermediate connector, C-101 ASC OFF switch
connector
Q: Is the check result normal?

YES : Go to Step 6.
NO : Repair the damaged connector.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-237

STEP 6. Wiring harness check between C-313 ETACS-ECU
connector terminal No.15 and C-101 ASC OFF switch
connector terminal No.1

• Check the power supply circuit for short circuit.

Q: Is the check result normal?

YES : Go to Step 7.
NO : Repair the wiring harness between C-313

ETACS-ECU connector terminal No.15 and C-101
ASC OFF switch connector terminal No.1.

STEP 7. Using scan tool MB991958, check the DTC for
other systems
Using scan tool, check that DTC U0141 is not set by the combi-
nation meter system.
Q: Is the DTC set?

YES : Diagnose the combination meter (Refer to GROUP

54A

− Combination Meter/DTC

P.54A-53

). Then go to

Step 10.

NO : Go to Step 8.

STEP 8. Using scan tool MB991958, check the DTC for
other systems
Using scan tool, check that DTC U0121 is not set by the
ETACS system.
Q: Is the DTC set?

YES : Perform troubleshooting on ETACS-ECU (Refer to

GROUP 54A

− ETACS/DTC

P.54A-741

). Then go to

Step 9.

NO : Go to Step 9.

STEP 9. Retest the system.
Q: Does ASC OFF display or ASC OFF light turn ON and

OFF normally?
YES : Intermittent malfunction (Refer to GROUP 00

− How

to Use Troubleshooting/How to Cope with Intermittent
Malfunctions

P.00-15