Mitsubishi Outlander GS45X. Manual — part 394

SERVICE SPECIFICATIONS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-3

SERVICE SPECIFICATIONS

M1355008200131

DIAGNOSIS

INTRODUCTION TO ASC DIAGNOSIS

M1355000800065

The active stability control system (ASC) operates
differently from conventional brake systems. These
differences include sounds, sensations, and vehicle
performance that owners and service technicians
who are not familiar with ASC may not be used to.

Some operational characteristics may seem to be
malfunctions, but they are simply signs of normal
ASC operation. When diagnosing the ASC system,
keep these operational characteristics in mind.
Inform the owner of the kind of performance charac-
teristics to expect from an ASC-equipped vehicle.

ASC DIAGNOSTIC TROUBLE CODE
DETECTION CONDITIONS

ASC diagnostic trouble codes (ASC DTCs) are set
under different conditions, depending on the mal-
function detected. Most ASC DTCs will only be set
during vehicle operation. Some ASC DTCs will also
be set during the ASC self-check immediately after
the engine is started.

When you check if an ASC DTC will be displayed
again after the DTC has been erased, you should
duplicate the ASC DTC set conditions. Depending on
the detection timing and set conditions for the spe-
cific ASC DTC, you must either drive the vehicle or
turn the engine off and restart it. To set the proper
conditions for that DTC again, refer to "ASC DTC
SET CONDITIONS" for each ASC DTC that you are
trying to reset.

ASC DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1355000900170

Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find an
ASC fault.
1. Gather information about the problem from the

customer.

2. Verify that the condition described by the

customer exists.

3. Check the vehicle for any ASC DTC.
4. If you cannot verify the condition and there are no

ASC DTCs, the malfunction is intermittent. Refer
to GROUP 00, How to use
Troubleshooting/Inspection Service Points

− How

to Cope with Intermittent Malfunctions

P.00-15

.

5. If you can verify the condition but there are no

ASC DTCs, or the system cannot communicate
with the scan tool, check that the basic brake
system is operating properly.

• If the basic brake system is not operating prop-

erly, refer to the GROUP 35A, Basic Brake Sys-
tem Diagnostic troubleshooting strategy

P.35A-6

.

• If the basic brake system is operating properly,

refer to

P.35C-216

.

6. If there is an ASC DTC, record the number of the

DTC, then erase the DTC from the memory using
the scan tool.

7. Recreate the ASC DTC set conditions to see if the

same ASC DTC will set again.

• If the same ASC DTC sets again, perform the

diagnostic procedures for the DTC. Refer to

P.35C-18

.

• If you cannot get the same ASC DTC to set

again, the malfunction is intermittent. Refer to
GROUP 00, How to use Troubleshooting/Inspec-
tion Service Points

− How to Cope with Intermit-

tent Malfunctions

P.00-15

.

Item

Standard value

Wheel speed sensor current mA

5.9

− 8.4 or 11.8 − 16.8

Wheel speed sensor insulation resistance M

Ω

5 or more

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-4

ABS WARNING LIGHT, ASC
WARNING/OPERATION LIGHT AND BRAKE
WARNING LIGHT CHECK

M1352012001037

Check that ABS and brake warning light, ASC warning/opera-
tion light illuminate as follows.
NOTE: The brake warning light is used as a warning light for
parking brake, brake fluid level, and EBD control.
1. When the ignition switch is turned to the ON position, ABS

and brake warning light, ASC warning/operation light
illuminate.

2. The ABS and brake warning light, ASC warning/operation

light illuminate for three seconds

*1

and then turn OFF

*2

.

3. Otherwise, check the diagnostic trouble code.
NOTE:

.

•

*1

: The ABS warning light may stay ON until the vehicle

speed reaches 10 km/h. As far as ABS-ECU stores any
diagnostic trouble code related to the wheel speed sensor
malfunction or the motor malfunction as past trouble,
ABS-ECU continues illuminating the ABS warning light until
it verifies that the malfunction for that code is resolved (star-
tup check).

•

*2

: The brake warning light does not turn OFF when the

parking brake is applied or the brake fluid level is lowered.

DIAGNOSTIC FUNCTION

M1352011201276

ON-BOARD DIAGNOSTICS

If the ASC-ECU detects any problem in the CAN
communication line or the ECUs, which the
ASC-ECU is communicating with, it stores a diag-
nostic trouble code. The DTCs have 73 items. The
DTCs can be confirmed by connecting scan tool

MB991958 (M.U.T.-III sub assembly.) The stored
DTCs are not erased even after the ignition switch
has been turned to the LOCK (OFF) position, or the
battery has been disconnected. The DTCs can be
erased by operating scan tool MB991958 (M.U.T.-III
sub assembly.)

HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)

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

AC901744AB

ABS warning light

ABS warning
light, Brake
warning light,
ASC warning/
operation light

Ignition switch

Illuminated

Approximately 3s

ON
ACC,
LOCK

START

Brake warning light

Not
illuminated

ASC warning/
operation light

<Color liquid
crystal display>

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-5

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. Ensure that the ignition switch is at the "LOCK" (OFF)

position.

2. Start up the personal computer.
3. Connect special tool MB991827 to special tool MB991824

and the personal computer.

4. Connect special tool MB991910 to the special tool

MB991824.

5. Connect special tool MB991910 to the data link connector.
6. Turn the power switch special tool MB991824 to the "ON"

position.
NOTE: When the special tool MB991824 is energized, the
special tool MB991824 indicator light will be illuminated in a
green color.

7. Start the M.U.T.-III system on the personal computer.
NOTE: Disconnect the scan tool MB991958 in the reverse
order of the connecting sequence, making sure that the ignition
switch is at the "LOCK" (OFF) position.

HOW TO READ AND ERASE DIAGNOSTIC
TROUBLE CODES

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

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.
NOTE: If the battery voltage is low, diagnostic trouble codes will
not be set. Check the battery if scan tool MB991958 does not
display.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "System Select."
4. Select "ABS/ASC/ASTC" from the system list, and select the

"OK" button.

5. Select "Diagnostic Trouble Code." to read the DTC.
6. If a DTC is set, it is shown.
7. Choose "DTC erase" to erase the DTC.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link
connector

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link
connector

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-6

HOW TO READ DATA LIST

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

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. Select "System Select."
4. Select "ABS/ASC/ASTC" from the system list, and select the

"OK" button.

5. Select "Data List."

HOW TO PERFORM ACTUATOR TEST

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

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link
connector