Mitsubishi Outlander XL. Manual — part 650

DIAGNOSIS

INTRODUCTION TO ASC DIAGNOSIS

M13506100119USA0000010000

The active skid 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 characteristics 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
malfunction 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 specific
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

M13506100004USA0000010000

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
properly, refer to the GROUP 35A, Basic Brake

System Diagnostic troubleshooting strategy P.
35A-5.

｠

If the basic brake system is operating properly,
refer to P.35C-160.

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-11.

｠

If you cannot get the same ASC DTC to set again,
the malfunction is intermittent. Refer to GROUP
00, How to use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent
Malfunctions P.00-15.

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-7

DIAGNOSIS

DIAGNOSTIC FUNCTION

M13506100121USA0000010000

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 diagnostic 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

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting 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

35C-8

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting 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."

6.

If a DTC is set, it is shown.

7.

Choose "DTC erase" to erase the DTC.

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

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting 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."

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-9

DIAGNOSIS

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

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting 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.

Choose "Actuator Test" from "ABS" screen.

6.

Choose an appropriate item and select the "OK" button.

HOW TO DIAGNOSE THE CAN BUS LINE

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

35C-10

ACTIVE SKID CONTROL SYSTEM (ASC)

DIAGNOSIS