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

Ω 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

Ω 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