Mitsubishi Outlander XL. Manual - part 650

DIAGNOSIS

INTRODUCTION TO ASC DIAGNOSIS

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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

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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

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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

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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