Mitsubishi Galant 9G. Manual - part 1231

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-28

<Comment>
Malfunction in red displayed area is estimated. 
Please refer to service manual and inspect with 
’CAN Detail 
Diagnosis’.

Diagnostic Item 16
Diagnose CAN bus lines thoroughly 
<Vehicles with ABS and vehicles with 
multi-center display (middle-grade 
type)>

P.54C-520

<Comment>
Harness disconnection or loose connection in red 
displayed area is 
estimated.

Diagnostic Item 18
Diagnose the lines between CAN main 
bus line and the powertrain control 
module <Vehicles with ABS>

P.54C-562

<Comment>
Harness disconnection or loose connection in red 
displayed area is 
estimated.

Diagnostic Item 19
Diagnose the lines between CAN main 
bus line and the ABS-ECU.

P.54C-568

MUT-III SCREEN

DIAGNOSIS DETAILS

REFERENCE 
PAGE

AC305792

ETACS

-ECU

AC-ECU

: Red section on screen

PCM

SRS-ECU

METER

-ECU

AB

MUT

J/C

C.DISPLAY

ABS-ECU

AC305792

: Red section on screen

PCM

AG

ETACS

-ECU

AC-ECU

SRS-ECU

C.DISPLAY

MUT

J/C

ABS-ECU

METER

-ECU

AC305792

: Red section on screen

AH

ETACS

-ECU

AC-ECU

SRS-ECU

C.DISPLAY

MUT

J/C

ABS-ECU

METER

-ECU

PCM

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-29

<Comment>
Harness disconnection or loose connection in red 
displayed area is 
estimated.

Diagnostic Item 20
Diagnose the lines between CAN main 
bus line and the ETACS-ECU.

P.54C-576

<Comment>
Harness disconnection or loose connection in red 
displayed area is 
estimated.

Diagnostic Item 21
Diagnose the lines between CAN main 
bus line and the multi-center display 
(middle-grade type)

P.54C-581

MUT-III SCREEN

DIAGNOSIS DETAILS

REFERENCE 
PAGE

AC305792

: Red section on screen

AI

ETACS

-ECU

AC-ECU

SRS-ECU

C.DISPLAY

MUT

J/C

METER

-ECU

PCM

ABS-ECU

AC305792

: Red section on screen

AJ

ETACS

-ECU

AC-ECU

SRS-ECU

C.DISPLAY

MUT

J/C

METER

-ECU

PCM

ABS-ECU

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-30

NOTE: If the screen other than above is displayed, 
troubles are present at two or more spots. In this 
case, diagnose CAN bus lines by referring to the 
trouble spot pinpoint procedures.

NOTE: If a trouble cannot be solved after performing 
the diagnosis other than item 16, diagnose CAN bus 
line thoroughly.

<Comment>
Harness disconnection or loose connection in red 
displayed area is 
estimated.

Diagnostic Item 22
Diagnose the lines between CAN main 
bus line and the A/C-ECU.

P.54C-587

<Comment>
Harness disconnection or loose connection in red 
displayed area is 
estimated.

Diagnostic Item 23
Diagnose the lines between CAN main 
bus line and the SRS-ECU.

P.54C-594

<Comment>
Harness disconnection or loose connection in red 
displayed area is 
estimated.

Diagnostic Item 24
Diagnose the lines between CAN main 
bus line and the combination meter.

P.54C-602

MUT-III SCREEN

DIAGNOSIS DETAILS

REFERENCE 
PAGE

AC305792

: Red section on screen

AK

ETACS

-ECU

AC-ECU

SRS-ECU

C.DISPLAY

MUT

J/C

METER

-ECU

PCM

ABS-ECU

AC305792

: Red section on screen

AL

ETACS

-ECU

AC-ECU

SRS-ECU

C.DISPLAY

MUT

J/C

METER

-ECU

PCM

ABS-ECU

AC305792

: Red section on screen

AM

AC-ECU

SRS-ECU

C.DISPLAY

MUT

J/C

METER

-ECU

PCM

ABS-ECU

ETACS

-ECU

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-31

CAN BUS DIAGNOSTICS

DIAGNOSTIC ITEM 1: Diagnose shorts in the power supply to CAN bus line <Vehicles without ABS 
and vehicles without multi-center display (middle-grade type)>

CAUTION

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

DATA LINK
CONNECTOR

ETACS-ECU

POWERTRAIN
CONTROL MODULE

JOINT
CONNECTOR (3)

COMBINATION
METER

A/C-ECU

SRS-ECU

NOTE

: MANUAL AIR CONDITIONING SYSTEM <LOW>
: MANUAL AIR CONDITIONING SYSTEM <MIDDLE>
  OR AUTOMATIC AIR CONDITIONING SYSTEM