Mitsubishi Outlander GS45X. Manual — part 1267

EXPLANATION ABOUT THE SCAN TOOL (M.U.T.-III) CAN BUS DIAGNOSTICS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-13

2. Pinpoint possible trouble spot according to

diagnostic trouble code

If diagnostic trouble code related to CAN
communication is set as past trouble, isolate
opens as described below.

ECU C and
ECU D

Trouble in
CAN bus line
(d)

ECUs C and D communicate
with scan tool MB991958 via
CAN bus lines (b), (c), (d), (e)
and (g). Scan tool MB991958
judges that CAN bus lines (b)
and (c) are normal, because it
can communicate with ECU B.
Possible trouble may be
present in CAN bus line (d),
(e) or (g) or the power supply
system to ECU C and ECU D.
CAN bus line (d) is shared by
ECUs C and D when they
communicate with scan tool
MB991958, so CAN bus line
(d) is suspected as ultimate
cause. CAN bus line (g) or (e)
and power supply systems to
ECU C or D are also
suspected as second cause.

ECU B and
ECU D

CAN bus line
(e) or (f) or
power supply
system to
ECU B or D

ECUs B and D communicate
with scan tool MB991958 via
CAN bus lines (b), (c), (d), (e)
and (f). Scan tool MB991958
judges that CAN bus lines (b),
(c) and (d) are normal,
because it can communicate
with ECU C. Possible trouble
may be present in CAN bus
line (f) or (e) or the power
supply system to ECU B or
ECU D.

All ECU
(except
ETACS-ECU)

CAN bus line
(b)

The other ECUs except the
ETACS-ECU use CAN bus
lines (b) and (h) when they
communicate with scan tool
MB991958. It must be
assumed that CAN bus line (b)
is defective since the
ETACS-ECU can
communicate with scan tool
MB991958.

ECU which
cannot
communicate
with the scan
tool

Possible
trouble spot

Logic for narrowing down trouble spot

AC204742BJ

ECU B

ECU C

ECU D

ECU A

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

ETACS-ECU
(Gateway)

Data link
connector

AC204742BK

ECU B

ECU C

ECU D

ECU A

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

ETACS-ECU
(Gateway)

Data link
connector

AC204742BP

ECU B

ECU C

ECU D

ECU A

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

ETACS-ECU
(Gateway)

Data link
connector

EXPLANATION ABOUT THE SCAN TOOL (M.U.T.-III) CAN BUS DIAGNOSTICS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-14

NOTE: If you pinpoint trouble spot according to
diagnostic trouble code, you should use time-out
diagnostic trouble code. Diagnostic trouble code
related to failure information is set when the data
to be set contains an error, so CAN bus line itself
is probably normal.

NOTE: Time-out diagnostic trouble codes are
stored in each ECU memory individually. There-
fore, it is possible that these diagnostic trouble
codes have not been set simultaneously. If the
trouble spot cannot be found when you diagnose
by judging from multiple diagnostic trouble codes,
check the communication lines between each
ECU.

Diagnostic
trouble code
to be set

Possible
trouble spot

Logic for narrowing down trouble spot

Time-out
diagnostic
trouble code
associated with
ECU D is stored
in ECU A, ECU
B and ECU C.

Trouble in
CAN bus line
(e) and
power supply
system to
ECU D

When time-out diagnostic
trouble code associated
with ECU D is stored in
ECU A, B and C, or
time-out diagnostic trouble
code associated with
ECUs A, B and C is stored
in ECU D, or "bus off"
diagnostic trouble code is
stored in ECU D, CAN bus
line (e) is suspected. When
diagnostic trouble code is
not stored in ECU D, the
power supply to ECU D is
suspected.

Time-out
diagnostic
trouble code
associated with
ECUs A, B and
C is stored in
ECU D.
"Bus off"
diagnostic
trouble code is
stored in ECU
D.
Time-out
diagnostic
trouble code
associated with
ECU A is stored
in ECUs B, C
and D.

Trouble in
CAN bus line
(a) or (c) and
power supply
system to
ECU A.

When time-out diagnostic
trouble code associated
with ECU A is stored in
ECUs B, C and D, or
time-out diagnostic trouble
code associated with
ECUs B, C and D is stored
in ECU A, or "bus off"
diagnostic trouble code is
stored in ECU A, CAN bus
line (a) or (c) is suspected.
When diagnostic trouble
code is not stored in ECU
A, the power supply to
ECU A is suspected.

Time-out
diagnostic
trouble code
associated with
ECUs B, C and
D is stored in
ECU A.
"Bus off"
diagnostic
trouble code is
stored in ECU
A.

AC204742BL

ECU B

ECU C

ECU D

ECU A

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

ETACS-ECU
(Gateway)

Data link
connector

AC204742BM

ECU B

ECU C

ECU D

ECU A

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

ETACS-ECU
(Gateway)

Data link
connector

EXPLANATION ABOUT THE SCAN TOOL (M.U.T.-III) CAN BUS DIAGNOSTICS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-15

Time-out
diagnostic
trouble codes
associated with
ECUs C and D
are stored in
ECU A and
ECU B.

Trouble in
CAN bus line
(d)

If time-out diagnostic
trouble codes associated
with ECUs C and D are
stored in ECUs A and B, or
time-out codes associated
with ECUs A and B are
stored in ECUs C and D,
CAN bus line (d) is
suspected. CAN bus line
(g) or (e) and power supply
systems to ECU C or D are
also suspected as second
cause.

Time-out
diagnostic
trouble codes
associated with
ECUs A and B
are stored in
ECU C and
ECU D.
Time-out
diagnostic
trouble codes
associated with
ECUs A, B, C
and D are
stored in
ETACS-ECU.

Trouble in
CAN bus line
(b)

It must be assumed that a
fault was present in CAN
bus line (b) when the
ETACS-ECU has set a
time-out diagnostic trouble
code for ECU A, B, C or D.

Time-out
diagnostic
trouble codes
associated with
ETACS-ECU is
stored in ECU
A, B, C and
ECU D.

Diagnostic
trouble code
to be set

Possible
trouble spot

Logic for narrowing down trouble spot

AC204742 BU

ECU B

ECU C

ECU D

ECU A

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

ETACS-ECU
(Gateway)

Data link
connector

AC204742BP

ECU B

ECU C

ECU D

ECU A

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

ETACS-ECU
(Gateway)

Data link
connector

DIAGNOSTIC TROUBLE CODE DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-16

DIAGNOSTIC TROUBLE CODE DIAGNOSIS

M1548304500326

ON-BOARD DIAGNOSTICS

The CAN is a communication method which the
ECUs use in order to communicate each other. The
CAN-related diagnostic trouble codes will be stored
in the following ECUs, which use the CAN communi-
cation.

• ETACS-ECU

• ECM

• TCM <CVT, A/T>

• ABS-ECU <vehicles without ASC>

• ASC-ECU <vehicles with ASC>

• AWD-ECU <Electric control AWD>

• AWC-ECU <S-AWC>

• Steering wheel sensor <vehicles with ASC>

• A/C-ECU

• SRS-ECU

• Occupant classification-ECU

• Radio and CD player <vehicles with radio and CD

player>

• Radio and CD changer <vehicles with radio and

CD changer>

• CAN box unit <vehicles with MMCS>

• Satellite radio tuner <vehicles satellite radio>

• WCM <vehicles without KOS>

• KOS-ECU <vehicles with KOS>

• Combination meter

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

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

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

7. Start the scan tool system on the personal computer.
NOTE: Disconnecting scan tool MB991958 is the reverse of the
connecting sequence, making sure that the ignition switch is at
the "LOCK" (OFF) position.

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

ZC501967

AC404789

AC702802

MB991824

MB991827

MB991910

Data link

connector

AB