Mitsubishi Lancer (4A9 engine). Manual - part 253

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STEP 19. M.U.T.-III CAN bus diagnostics 
(checking the engine-ECU for internal short)

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to .
Disconnect B-09 <except 1800-Diesel> or B-40 
<1800-Diesel> engine-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 B-09 

<Petrol> or B-40 <Diesel> engine-ECU 
connector and C-124 joint connector 
(CAN3).

NO  : 

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

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Diagnosis Item 4: Diagnose shorts in the earth to CAN-C bus line

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-C Communication Circuit <Except for RALLIART>

ETACS-ECU

INTERFACE 
CIRCUIT

CAN DRIVE 
CIRCUIT

ASC-ECU

A/T-ECU

ABS-ECU

CVT-ECU

STEERING 
WHEEL SENSOR 
<AFS, ASC>

ENGINE-ECU

ELECTRIC 
POWER 
STEERING-ECU

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

CORNER SENSOR/
BACK SENSOR-ECU

DIESEL

:

PETROL

:

1800-PETROL, 2000

:

NOTE

PETROL (EXCEPT SOHC)

:

VEHICLES WITHOUT ASC

:

VEHICLES WITH ASC

:

HEADLAMP 
AUTOMATIC 
LEVELLING-ECU

AS&G-ECU

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AC801250

Connectors: A-04, A-58 <LHD>

AB

A-04 (B), 
A-58 (B)

AC801253

AG

Connector: A-58 <RHD>

A-58 (B)

AC800715

Connectors: B-09, B-40

BC

B-09 (GR), 
B-40 (B)

ACB02645

AE

C-03 (GR)

C-35

Connectors: C-03, C-35, C-40, C-124, C-127
<LHD>

C-40

C-127 (GR)

C-124 (GR)

ACB02648

AD

C-03 (GR)

C-114

C-35

Connectors: C-03, C-35, C-114, C-127 <RHD>

C-127 (GR)

ACB02646

AD

C-64

C-14

C-114

Connectors: C-14, C-64, C-114 <LHD>

ACB02647

AD

C-64

C-124 (GR)

C-04 (GR)

Connectors: C-14, C-64, C-124 <RHD>

AC612708 AW

Connector: C-211 <LHD>

AC612716 AX

Connectors: C-211 <RHD>

ACA00886

BE

Connector: C-301 <LHD>
ETACS-ECU

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