Mitsubishi Lancer (4A9 engine). Manual - part 252

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-32

STEP 9. Check the wiring harness between C-64 
AS&G-ECU connector and C-124 joint connector 
(CAN3) for line-to-line short.

CAUTION

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

(1) Disconnect joint connector (CAN3), and check 

that there is continuity at the harness side.

(2) Check that there is continuity between C-124 

joint connector terminal No.16 and 5 <Petrol>.

OK: No continuity

(3) Check that there is continuity between C-124 

joint connector terminal No.17 and 6 <Diesel>.

OK: No continuity

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Go to Step 18.

STEP 10. Check the wiring harness between B-09 
<Petrol> or B-40 <Diesel> engine-ECU connector 
and C-124 joint connector (CAN3) for line-to-line 
short.

CAUTION

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

• Strictly observe the specified wiring harness 

repair procedure. For details refer to .

(1) Disconnect joint connector (CAN3), and check 

that there is continuity at the harness side.

(2) Check that there is continuity between C-124 

joint connector terminal No.10 and 21.

OK: No continuity

Q: Is the check result normal?

YES : 

Check C-127 intermediate connector, and 

repair if necessary. If the intermediate 
connector is in good condition, repair the 
wiring harness between C-03 joint 
connector (CAN2) and C-124 joint 
connector (CAN3).

NO : 

Go to Step 19.

STEP 11. M.U.T.-III CAN bus diagnostics 
(checking the steering wheel sensor for internal 
short)

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to .
Disconnect C-211 steering wheel sensor connector, 
and diagnose the CAN bus line.

ACB01921AB

M.U.T.

JC

JC

SAS

KOS/
WCM

SRS

A/C

AUDIO

METER

AT/

CVT

EPS

ENGINE

ETACS

ABS/

ASC

MMCS

: Red section on screen

AS&G

Levelling

Cor ner

JC

OK: The display of the M.U.T.-III is as shown 
in the figure.

Q: Does M.U.T.-III screen correspond to the 

illustration?
YES : 

Repair the wiring harness between C-211 

steering wheel sensor connector and C-03 
joint connector (CAN2).

NO : 

Check the steering wheel sensor connector, 
and repair if necessary. If the steering wheel 
sensor connector is in good condition, 
replace the steering wheel sensor.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-33

STEP 12. M.U.T.-III CAN bus diagnostics 
(checking the corner sensor/back sensor-ECU 
for internal short)

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to .
Disconnect C-40 corner sensor/back sensor-ECU 
connector, and diagnose the CAN bus line.

ACB01921AB

M.U.T.

JC

JC

SAS

KOS/
WCM

SRS

A/C

AUDIO

METER

AT/

CVT

EPS

ENGINE

ETACS

ABS/

ASC

MMCS

: Red section on screen

AS&G

Levelling

Cor ner

JC

OK: The display of the M.U.T.-III is as shown 
in the figure.

Q: Does M.U.T.-III screen correspond to the 

illustration?
YES : 

Repair the wiring harness between C-40 

corner sensor/back sensor-ECU connector 
and C-03 joint connector (CAN2).

NO : 

Check the corner sensor/back sensor-ECU 
connector, and repair if necessary. If the 
corner sensor/back sensor-ECU connector 
is in good condition, replace the corner 
sensor/back sensor-ECU.

STEP 13. Check the wiring harness between C-
301 ETACS-ECU connector and C-03 joint 
connector (CAN2) for line-to-line short.

CAUTION

• A digital multimeter should be used. For 

details refer to .

• The test wiring harness should be used. For 

details refer to .

• Strictly observe the specified wiring harness 

repair procedure. For details refer to .

(1) Disconnect the ETACS-ECU connector and the 

joint connector (CAN2), and check that there is 
continuity at the harness side.

(2) Check that there is continuity between C-03 joint 

connector terminal No.6 and 19.

OK: No continuity

Q: Is the check result normal?

YES : 

Check the ETACS-ECU connector, and 

repair if necessary. If the ETACS-ECU 
connector is in good condition, replace the 
ETACS-ECU.

NO : 

Repair the wiring harness between C-301 
ETACS-ECU connector and C-03 joint 
connector (CAN2).

STEP 14. M.U.T.-III CAN bus diagnostics 
(checking the headlamp automatic levelling-ECU 
for internal short)

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to .
Disconnect C-14 headlamp automatic levelling-ECU 
connector, and diagnose C-14 headlamp automatic 
levelling-ECU the CAN bus line.

ACB01921AB

M.U.T.

JC

JC

SAS

KOS/
WCM

SRS

A/C

AUDIO

METER

AT/

CVT

EPS

ENGINE

ETACS

ABS/

ASC

MMCS

: Red section on screen

AS&G

Levelling

Cor ner

JC

OK: The display of the M.U.T.-III is as shown 
in the figure.

Q: Does M.U.T.-III screen correspond to the 

illustration?
YES : 

Repair the wiring harness between C-14 

headlamp automatic levelling-ECU 
connector and C-124 joint connector 
(CAN3).

NO : 

Check the headlamp automatic levelling-
ECU connector, and repair if necessary. If 
the headlamp automatic levelling-ECU 
connector is in good condition, replace the 
headlamp automatic levelling-ECU.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-34

STEP 15. M.U.T.-III CAN bus diagnostics 
(checking the ABS-ECU <vehicles without ASC> 
or ASC-ECU <vehicles with ASC> for internal 
short)

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to .
Disconnect A-04 ABS-ECU connector <vehicles 
without ASC> or A-58 ASC-ECU connector <vehi-
cles with ASC>, and diagnose the CAN bus line.

ACB01921AB

M.U.T.

JC

JC

SAS

KOS/
WCM

SRS

A/C

AUDIO

METER

AT/

CVT

EPS

ENGINE

ETACS

ABS/

ASC

MMCS

: Red section on screen

AS&G

Levelling

Cor ner

JC

OK: The display of the M.U.T.-III is as shown 
in the figure.

Q: Does M.U.T.-III screen correspond to the 

illustration?
YES : 

Repair the wiring harness between A-04 

ABS-ECU connector <vehicles without 
ASC> or A-58 ASC-ECU connector 
<vehicles with ASC> and C-124 joint 
connector (CAN3).

NO : 

Check the ABS-ECU connector <vehicles 
without ASC> or ASC-ECU connector 
<vehicles with ASC>, and repair if 
necessary. If the ABS-ECU connector 
<vehicles without ASC> or ASC-ECU 
connector <vehicles with ASC> is in good 
condition, replace the ABS-ECU <vehicles 
without ASC> or ASC-ECU <vehicles with 
ASC>.

STEP 16. M.U.T.-III CAN bus diagnostics 
(checking the A/T-ECU <A/T> or CVT-ECU <CVT> 
for internal short)

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to .
Disconnect C-32 A/T-ECU connector <A/T> or C-35 
CVT-ECU connector <CVT>, and diagnose the CAN 
bus line.

ACB01921AB

M.U.T.

JC

JC

SAS

KOS/
WCM

SRS

A/C

AUDIO

METER

AT/

CVT

EPS

ENGINE

ETACS

ABS/

ASC

MMCS

: Red section on screen

AS&G

Levelling

Cor ner

JC

OK: The display of the M.U.T.-III is as shown 
in the figure.

Q: Does M.U.T.-III screen correspond to the 

illustration?
YES : 

Repair the wiring harness between C-32 A/

T-ECU connector <A/T> or C-35 CVT-ECU 
connector <CVT> and C-124 joint connector 
(CAN3).

NO : 

Check the A/T-ECU connector <A/T> or 
CVT-ECU connector <CVT>, and repair if 
necessary. If the A/T-ECU connector <A/T> 
or CVT-ECU connector <CVT> is in good 
condition, replace the A/T-ECU <A/T> or 
CVT-ECU <CVT>.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-35

STEP 17. M.U.T.-III CAN bus diagnostics 
(checking the electric power steering-ECU for 
internal short)

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to .
Disconnect C-114 electric power steering-ECU con-
nector, and diagnose the CAN bus line.

ACB01921AB

M.U.T.

JC

JC

SAS

KOS/
WCM

SRS

A/C

AUDIO

METER

AT/

CVT

EPS

ENGINE

ETACS

ABS/

ASC

MMCS

: Red section on screen

AS&G

Levelling

Cor ner

JC

OK: The display of the M.U.T.-III is as shown 
in the figure.

Q: Does M.U.T.-III screen correspond to the 

illustration?
YES : 

Repair the wiring harness between C-114 

electric power steering-ECU connector and 
C-124 joint connector (CAN3).

NO : 

Check the electric power steering-ECU 
connector, and repair if necessary. If the 
electric power steering-ECU connector is in 
good condition, replace the electric power 
steering-ECU.

STEP 18. M.U.T.-III CAN bus diagnostics 
(checking the C-64 AS&G-ECU for internal short)

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to .
Disconnect C-64 AS&G-ECU connector, and diag-
nose the CAN bus line.

ACB01921AB

M.U.T.

JC

JC

SAS

KOS/
WCM

SRS

A/C

AUDIO

METER

AT/

CVT

EPS

ENGINE

ETACS

ABS/

ASC

MMCS

: Red section on screen

AS&G

Levelling

Cor ner

JC

OK: The display of the M.U.T.-III is as shown 
in the figure.

Q: Does M.U.T.-III screen correspond to the 

illustration?
YES : 

Repair the wiring harness between C-64 

AS&G-ECU connector and C-124 joint 
connector (CAN3).

NO : 

Check the AS&G-ECU connector, and 
repair if necessary. If the AS&G-ECU 
connector is in good condition, replace the 
AS&G-ECU.