Mitsubishi Lancer (4A9 engine). Manual - part 274

 

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Mitsubishi Lancer (4A9 engine). Manual - part 274

 

 

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-120

STEP 22. M.U.T.-III CAN bus diagnostics 
(checking the combination meter for internal 
failure)

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 23. M.U.T.-III CAN bus diagnostics 
(checking the WCM for internal failure)

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 24. M.U.T.-III CAN bus diagnostics 
(checking the KOS-ECU for internal failure)

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?

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-121

YES : 

Repair the wiring harness between C-23 

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

NO : 

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

STEP 25. M.U.T.-III CAN bus diagnostics 
(checking the radio and CD player for internal 
failure)

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to .
Disconnect C-103 radio and CD player 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-103 

radio and CD player connector and C-04 
joint connector (CAN1).

NO : 

Check the radio and CD player connector, 
and repair if necessary. If the radio and CD 
player connector is in good condition, 
replace the radio and CD player.

STEP 26. M.U.T.-III CAN bus diagnostics 
(checking the CAN box unit for internal failure)

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to .
Disconnect C-54 CAN box unit 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-54 

CAN box unit connector and C-04 joint 
connector (CAN1).

NO : 

Check the CAN box unit connector, and 
repair if necessary. If the CAN box unit 
connector is in good condition, replace the 
CAN box unit.

STEP 27. Trouble symptom check
Diagnose the CAN bus line, and check that normal 
condition is displayed.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

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

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-122

Diagnosis Item 24: Diagnose the ETACS-ECU, joint connector (CAN1) or lines between ETACS-ECU 
and joint connector (CAN1)

CAUTION

When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water 
pipe. If you fail to do, a component connected to the CAN bus line may be broken.

CAN-B Communication Circuit

ETACS-ECU

INTERFACE 
CIRCUIT

CAN DRIVE 
CIRCUIT

SRS-ECU

CPU

WCM

CAN BOX UNIT

KOS-ECU

CAN 
TRANSCEIVER 
CIRCUIT

CAN DRIVE 
CIRCUIT

CAN DRIVE 
CIRCUIT

Wire colour code 
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue 
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple     SI : Silver

RADIO AND 
CD PLAYER

CAN 
TRANSCEIVER 
CIRCUIT

INTERFACE 
CIRCUIT

VEHICLES WITHOUT A/C

:

VEHICLES WITH A/C

:

VEHICLES WITH KOS

:

NOTE

VEHICLES WITH WCM

:

VEHICLES WITH RADIO AND CD PLAYER

:

VEHICLES WITHOUT AUDIO

:

VEHICLES WITH MMCS

:

COMBINATION 
METER

HEATER CONTROL
PANEL
A/C-ECU

SPARE 
CONNECTOR 
(FOR AUDIO)

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-123

 

 

 

 

 

 

 

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