Mitsubishi Lancer (4A9 engine). Manual - part 265

 

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Mitsubishi Lancer (4A9 engine). Manual - part 265

 

 

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

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-84

ACB02645

AJ

C-03 (GR)

Connectors: C-03, C-124, C-127 <LHD>

C-127 (GR)

C-124 (GR)

ACB02648

AF

C-03 (GR)

Connectors: C-03, C-127 <RHD>

C-127 (GR)

ACB02647

AE

C-124 (GR)

Connector: C-124 <RHD>

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-85

FUNCTION
If the M.U.T.-III cannot communicate with the joint 
connector (CAN2) and the joint connector (CAN3), 
this diagnosis result will be set.

TROUBLE JUDGEMENT CONDITIONS
If a communication flag is not set for any ECU con-
nected to CAN-C (CAN3), it is determined that a fail-
ure has occurred.

TROUBLESHOOTING HINTS

• Malfunction of the connector [joint connector 

(CAN2), joint connector (CAN3) or intermediate 
connector failed]

• Malfunction of the wiring harness [open circuit 

between joint connector (CAN2) and joint con-
nector (CAN3)]

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-03 joint connector 
(CAN2) and C-124 joint connector (CAN3)

CAUTION

The strand end of the twist wire should be within 
10 cm from the connector. For details refer to .

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

STEP 2. Check the wiring harness between C-03 
joint connector (CAN2) and C-124 joint connector 
(CAN3)

CAUTION

Strictly observe the specified wiring harness 
repair procedure. For details refer to .
Disconnect joint connector (CAN2) and joint connec-
tor (CAN3), and check the following wiring harness 
for open circuit
(1) The wiring harness between C-03 joint connector 

(CAN2) terminal No.10 and C-124 joint connector 
(CAN3) terminal No.11 <CAN_H>

OK: Continuity exists (2 

 or less)

(2) The wiring harness between C-03 joint connector 

(CAN2) terminal No.21 and C-124 joint connector 
(CAN3) terminal No.22 <CAN_L>

OK: Continuity exists (2 

 or less)

NOTE: Check C-127 intermediate connector, and 
repair if necessary.

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 

Malfunctions ).

NO : 

Repair the wiring harness.

TROUBLESHOOTING

CONTROLLER AREA NETWORK (CAN)

54C-86

Diagnosis Item 15: Diagnose when the M.U.T.-III cannot receive the data sent by KOS-ECU <vehicles 
with KOS>

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-87

 

 

 

 

 

 

 

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