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.