Mitsubishi Lancer (4A9 engine). Manual — part 278

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-136

STEP 32. Check the wiring harness between C-60
heater control unit connector <vehicles without
A/C> or C-15 A/C-ECU connector <vehicles with
A/C> and C-04 joint connector (CAN1) for open
circuit.
Disconnect heater control unit connector <vehicles
without A/C> or A/C-ECU connector <vehicles with
A/C> connector and joint connector (CAN1), and
check the following wiring harness for open circuit.
(1) The wiring harness between C-60 heater control

unit connector <vehicles without A/C> or C-15 A/
C-ECU connector <vehicles with A/C> terminal
No.11 and C-04 joint connector (CAN1) terminal
No.8.

OK: Continuity exists (2

Ω or less)

(2) The wiring harness between C-60 heater control

unit connector <vehicles without A/C> or C-15 A/
C-ECU connector <vehicles with A/C> terminal
No.12 and C-04 joint connector (CAN1) terminal
No.19.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES :

Go to Step 33.

NO :

Repair the wiring harness between C-60
heater control unit connector <vehicles
without A/C> or C-15 A/C-ECU connector
<vehicles with A/C> and C-04 joint
connector (CAN1).

STEP 33. Check the wiring harness between C-01
combination meter connector and C-04 joint
connector (CAN1) for open circuit.
Disconnect combination meter connector and joint
connector (CAN1), and check the wiring harness for
open circuit.
(1) The wiring harness between C-01 combination

meter connector terminal No.14 and C-04 joint
connector (CAN1) terminal No.9.

OK: Continuity exists (2

Ω or less)

(2) The wiring harness between C-01 combination

meter connector terminal No.15 and C-04 joint
connector (CAN1) terminal No.20.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES <vehicles without KOS> :

Go to Step 34.

YES <vehicles with KOS> :

Go to Step 35.

NO (the check result is not normal.) :

Repair the

wiring harness between C-01 combination
meter connector and C-04 joint connector
(CAN1).

STEP 34. Check the wiring harness between C-06
WCM connector and C-04 joint connector (CAN1)
for open circuit.
Disconnect WCM connector and joint connector
(CAN1), and check the following wiring harness for
open circuit.
(1) The wiring harness between C-06 WCM

connector terminal No.11 and C-04 joint
connector (CAN1) terminal No.7.

OK: Continuity exists (2

Ω or less)

(2) The wiring harness between C-06 WCM

connector terminal No.10 and C-04 joint
connector (CAN1) terminal No.18.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES <vehicles with radio and CD player> :

Go to

Step 36.

YES <vehicles with MMCS (vehicles for Russia)> :

Go to Step 37.

YES <vehicles without MMCS and without radio
and CD player> :

Go to Step 38.

NO (the check result is not normal.) :

Repair the

wiring harness between C-06 WCM
connector and C-04 joint connector (CAN1).

STEP 35. Check the wiring harness between C-23
KOS-ECU connector and C-04 joint connector
(CAN1) for open circuit.
Disconnect KOS-ECU connector and joint connector
(CAN1), and check the following wiring harness for
open circuit.
(1) The wiring harness between C-23 KOS-ECU

connector terminal No.1 and C-04 joint connector
(CAN1) terminal No.5.

OK: Continuity exists (2

Ω or less)

(2) The wiring harness between C-23 KOS-ECU

connector terminal No.2 and C-04 joint connector
(CAN1) terminal No.16.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES <vehicles with radio and CD player> :

Go to

Step 36.

YES <vehicles with MMCS (vehicles for Russia)> :

Go to Step 37.

YES <vehicles without MMCS and without radio
and CD player> :

Go to Step 38.

NO (the check result is not normal.) :

Repair the

wiring harness between C-23 KOS-ECU
connector and C-04 joint connector (CAN1).

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-137

STEP 36. Check the wiring harness between C-
103 radio and CD player connector and C-04 joint
connector (CAN1) for open circuit.
Disconnect radio and CD player connector and joint
connector (CAN1), and check the following wiring
harness for open circuit.
(1) The wiring harness between C-103 radio and CD

player connector terminal No.23 and C-04 joint
connector (CAN1) terminal No.6.

OK: Continuity exists (2

Ω or less)

(2) The wiring harness between C-103 radio and CD

player connector terminal No.33 and C-04 joint
connector (CAN1) terminal No.17.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES :

Go to Step 39.

NO :

Repair the wiring harness between C-103
radio and CD player connector and C-04
joint connector (CAN1)

STEP 37. Check the wiring harness between C-54
CAN box unit connector and C-04 joint connector
(CAN1) for open circuit.
Disconnect CAN box unit connector and joint con-
nector (CAN1), and check the following wiring har-
ness for open circuit.
(1) The wiring harness between C-54 CAN box unit

connector terminal No.8 and C-04 joint connector
(CAN1) terminal No.6.

OK: Continuity exists (2

Ω or less)

(2) The wiring harness between C-54 CAN box unit

connector terminal No.9 and C-04 joint connector
(CAN1) terminal No.17.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES :

Go to Step 39.

NO :

Repair the wiring harness between C-54
CAN box unit connector and C-04 joint
connector (CAN1).

STEP 38. Check the wiring harness between C-
103 spare connector (for audio) and C-04 joint
connector (CAN1) for open circuit.
Disconnect joint connector (CAN1), and check the
following wiring harness for open circuit.
(1) The wiring harness between C-103 spare

connector (for audio) terminal No.8 and C-04 joint
connector (CAN1) terminal No.1.

OK: Continuity exists (2

Ω or less)

(2) The wiring harness between C-103 spare

connector (for audio) terminal No.18 and C-04
joint connector (CAN1) terminal No.17.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES :

Go to Step 39.

NO :

Repair the wiring harness between C-103
spare connector (for audio) and C-04 joint
connector (CAN1).

STEP 39. Check the wiring harness between C-
301 ETACS-ECU connector and C-04 joint
connector (CAN1) for open circuit.

CAUTION

Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect ETACS-ECU connector and joint con-
nector (CAN1), and check the following wiring har-
ness for open circuit.
(1) The wiring harness between C-301 ETACS-ECU

connector terminal No.6 and C-04 joint connector
(CAN1) terminal No.11

OK: Continuity exists (2

Ω or less)

(2) The wiring harness between C-301 ETACS-ECU

connector terminal No.7 and C-04 joint connector
(CAN1) terminal No.22

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES :

Go to Step 47.

NO :

Repair the wiring harness between C-301
ETACS-ECU connector and C-04 joint
connector (CAN1).

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-138

STEP 40. M.U.T.-III CAN bus diagnostics
(checking the SRS-ECU for internal short)

CAUTION

Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect C-122 SRS-ECU connector, and diag-
nose the CAN bus line.

ACB01921AC

M.U.T.

JC

JC

SAS

AT/

CVT

EPS

ENGINE

ABS/

ASC

: Red section on screen

AS&G

ETACS

JC

KOS/
WCM

SRS

A/C

AUDIO

METER

MMCS

Levelling

Cor ner

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-122

SRS-ECU connector and C-04 joint
connector (CAN1).

NO :

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

STEP 41. M.U.T.-III CAN bus diagnostics
(checking the heater control unit <vehicles
without A/C> or A/C-ECU <vehicles with A/C> for
internal short)

CAUTION

Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect C-60 heater control unit connector <vehi-
cles without A/C> or C-15 A/C-ECU connector <vehi-
cles with A/C>, and diagnose the CAN bus line.

ACB01921AC

M.U.T.

JC

JC

SAS

AT/

CVT

EPS

ENGINE

ABS/

ASC

: Red section on screen

AS&G

ETACS

JC

KOS/
WCM

SRS

A/C

AUDIO

METER

MMCS

Levelling

Cor ner

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-60

heater control unit connector <vehicles
without A/C> or C-15 A/C-ECU connector
<vehicles with A/C> and C-04 joint
connector (CAN1).

NO :

Check the heater control unit connector
<vehicles without A/C> or A/C-ECU
connector <vehicles with A/C>, and repair if
necessary. If the heater control unit
connector <vehicles without A/C> or A/C-
ECU connector <vehicles with A/C> is in
good condition, replace the heater control
unit <vehicles without A/C> or A/C-ECU
<vehicles with A/C>.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-139

STEP 42. M.U.T.-III CAN bus diagnostics
(checking the combination meter for internal
short)

CAUTION

Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect C-01 combination meter connector, and
diagnose the CAN bus line.

ACB01921AC

M.U.T.

JC

JC

SAS

AT/

CVT

EPS

ENGINE

ABS/

ASC

: Red section on screen

AS&G

ETACS

JC

KOS/
WCM

SRS

A/C

AUDIO

METER

MMCS

Levelling

Cor ner

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-01

combination meter connector and C-04 joint
connector (CAN1).

NO :

Check the combination meter connector,
and repair if necessary. If the combination
meter connector is in good condition,
replace the combination meter.

STEP 43 M.U.T.-III CAN bus diagnostics
(checking the WCM for internal short)

CAUTION

Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect C-06 WCM connector, and diagnose the
CAN bus line.

ACB01921AC

M.U.T.

JC

JC

SAS

AT/

CVT

EPS

ENGINE

ABS/

ASC

: Red section on screen

AS&G

ETACS

JC

KOS/
WCM

SRS

A/C

AUDIO

METER

MMCS

Levelling

Cor ner

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-06

WCM connector and C-04 joint connector
(CAN1).

NO :

Check the WCM connector, and repair if
necessary. If the WCM connector is in good
condition, replace the WCM.

STEP 44. M.U.T.-III CAN bus diagnostics
(checking the KOS-ECU for internal short)

CAUTION

Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect C-23 KOS-ECU connector, and diagnose
the CAN bus line.

ACB01921AC

M.U.T.

JC

JC

SAS

AT/

CVT

EPS

ENGINE

ABS/

ASC

: Red section on screen

AS&G

ETACS

JC

KOS/
WCM

SRS

A/C

AUDIO

METER

MMCS

Levelling

Cor ner

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?