Mitsubishi Outlander (2013+). Manual - part 718

 

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Mitsubishi Outlander (2013+). Manual - part 718

 

 

EXPLANATION ABOUT THE M.U.T.-III CAN BUS DIAGNOSTICS

CONTROLLER AREA NETWORK (CAN)

54C-8

CAN BUS LINE DIAGNOSTIC FLOW

ACB05636

NG

AB

From other diagnosis

1. M.U.T.-III CAN bus diagnostics

Go to ordinary diagnosis

OK:
P code, B code, 
C code or 
U code (current trouble)

OK: 
U code (past trouble)

2. Pinpoint possible trouble spot 
    according to diagnosis code

· Short between CAN bus lines.
· Short in CAN bus line to power 
  supply or earth.
· Open circuit in can bus line
· Broken terminator resistor
· Power supply to ECU poorly 
  earthed

· 

Checking the communication condition of ECUs.

1. M.U.T.-III CAN bus diagnostics

The M.U.T.-III diagnoses CAN bus lines in 
accordance with the following strategy.

• Checking the communication condition of ECUs

The M.U.T.-III narrows down troubles in circuit by 

itself. Its strategies are as follows.

AC502594AB

Diagnosis
connector

ECU B

ECU C

ECU D

ECU A

(a)

(b)

(c)

(d)

(e)

(f)

(g)

Reference circuit

EXPLANATION ABOUT THE M.U.T.-III CAN BUS DIAGNOSTICS

CONTROLLER AREA NETWORK (CAN)

54C-9

ECU which 
cannot 
communicate 
with the 
M.U.T.-III

Possible 
trouble spot

Logic for narrowing down trouble spot

ECU A

CAN bus line 
(a) and power 
supply system 
to ECU A

ECU A communicates with 
the M.U.T.-III via CAN bus 
lines (a) and (b). The 
M.U.T.-III judges that CAN 
bus line (b) is normal, 
because it can communicate 
with other ECUs. Possible 
trouble may be present in 
CAN bus line (a) or the power 
supply system to ECU A.

AC204742 AZ

Diagnosis
connector

ECU B

ECU C

ECU D

ECU A

(a)

(b)

(c)

(d)

(e)

(f)

(g)

ECU C

CAN bus line 
(g) and power 
supply system 
to ECU C

ECU C communicates with 
the M.U.T.-III via CAN bus 
lines (b), (c), (d) and (g). The 
M.U.T.-III judges that CAN 
bus lines (b), (c) and (d) are 
normal, because it can 
communicate with ECUs B 
and D. Possible trouble may 
be present in CAN bus line (g) 
or the power supply system to 
ECU C.

AC204742 BA

ECU B

ECU C

ECU D

ECU A

(a)

(b)

(c)

(d)

(e)

(f)

(g)

Diagnosis
connector

ECU C and 
ECU D

Trouble in 
CAN bus line 
(d)

ECUs C ad D communicate 
with the M.U.T.-III via CAN 
bus lines (b), (c), (d), (e) and 
(g). The M.U.T.-III 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 D or C. CAN 
bus line (d) is shared by ECUs 
C and D when they 
communicate with the 
M.U.T.-III, 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.

AC204742BB

ECU B

ECU C

ECU D

ECU A

(a)

(b)

(c)

(d)

(e)

(f)

(g)

Diagnosis
connector

EXPLANATION ABOUT THE M.U.T.-III CAN BUS DIAGNOSTICS

CONTROLLER AREA NETWORK (CAN)

54C-10

2. If diagnosis code related to CAN communication 

is set as past trouble, isolate opens as described 
below.

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

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

ECU B and 
ECU D

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

ECUs B ad D communicate 
with the M.U.T.-III via CAN 
bus lines (b), (c), (d), (e) and 
(f). The M.U.T.-III 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 D.

AC204742 BC

ECU B

ECU C

ECU D

ECU A

(a)

(b)

(c)

(d)

(e)

(f)

(g)

Diagnosis
connector

ECU which 
cannot 
communicate 
with the 
M.U.T.-III

Possible 
trouble spot

Logic for narrowing down trouble spot

Diagnosis 
code to be set

Possible 
trouble spot

Logic for narrowing down trouble spot

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

AC204742 BD

ECU B

ECU C

ECU D

ECU A

(a)

(b)

(c)

(d)

(e)

(f)

(g)

Diagnosis
connector

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

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

AC204742 BF

ECU B

ECU C

ECU D

ECU A

(a)

(b)

(c)

(d)

(e)

(f)

(g)

Diagnosis
connector

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

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-11

TROUBLESHOOTING

CAN BUS DIAGNOSTICS TABLE

M1548300202675

CAUTION

During diagnosis, a diagnosis code associated with another system may be set when the ignition 
switch is turned on with connector(s) disconnected. After completing the repair, confirm all systems 
for diagnosis code(s). If diagnosis code(s) are set, erase them all.

This diagnosis applies only to the CAN bus lines. If a 
different system is defective, proceed to the applica-
ble diagnosis section for each system. Observe the 
diagnosis procedure below only when the CAN bus 
line is defective.

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

Trouble in 
CAN bus line 
(d)

If time-out diagnosis 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.

AC204742BQ

ECU B

ECU C

ECU D

ECU A

(a)

(b)

(c)

(d)

(e)

(f)

(g)

Diagnosis
connector

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

Diagnosis 
code to be set

Possible 
trouble spot

Logic for narrowing down trouble spot

M.U.T.-III screen

Diagnosis detail

Reference 
page

(The ECUs that are not adopted are not 
displayed.)

Comment

ACC00029

ACC00029

ACC00029

M.U.T.

: Red section on screen

JC

ETACS

KOS

AUDIO

SRS

OSS

ABS/ASC

CVT

ENGINE

EPS

SAS

AWC

MMCS

A/C

ETG

METER

Corner

JC

JC

AC

Failure in red 
displayed area is 
estimated.

Diagnosis Item 1
Communication with no 
ECUs is possible 
(CAN-C).

P.54C-17

Diagnosis Item 2

*1

Diagnose shorts in the 
power supply to CAN-C.

P.54C-18

 

 

 

 

 

 

 

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