Mitsubishi Lancer (4A9 engine). Manual — part 244

TROUBLESHOOTING

LOCAL INTERCONNECT NETWORK (LIN)

54B-27

Q: Is the diagnosis code set?

YES :

Replace the security alarm sensor.

NO :

A poor connection, open circuit, or other
intermittent malfunctions in the LIN bus lines
between the security alarm sensor and the
ETACS-ECU (Refer to GROUP 00

− How to

Cope with Intermittent Malfunction ).

CONTROLLER AREA NETWORK (CAN)

54C-1

GROUP 54C

CONTROLLER

AREA NETWORK

(CAN)

CONTENTS

GENERAL INFORMATION . . . . . . . .

54C-2

SPECIAL TOOL(S) . . . . . . . . . . . . . .

54C-5

TEST EQUIPMENT . . . . . . . . . . . . . .

54C-7

SERVICE PRECAUTIONS. . . . . . . . .

54C-8

PRECAUTIONS ON HOW TO REPAIR THE
CAN BUS LINES . . . . . . . . . . . . . . . .

54C-9

EXPLANATION ABOUT THE M.U.T.-III CAN
BUS DIAGNOSTICS . . . . . . . . . . . . .

54C-9

TROUBLESHOOTING . . . . . . . . . . . .

54C-15

CAN BUS DIAGNOSIS CHART . . . . . . . . .

54C-15

CAN-RELATED CONNECTOR POSITION

54C-21

CAN BUS DIAGNOSIS . . . . . . . . . . . . . . . .

54C-24

DIAGNOSIS ITEM 1 . . . . . . . . . . . . . . . . . .

54C-24

DIAGNOSIS ITEM 2 . . . . . . . . . . . . . . . . . .

54C-26

DIAGNOSIS ITEM 3 . . . . . . . . . . . . . . . . . .

54C-27

DIAGNOSIS ITEM 4 . . . . . . . . . . . . . . . . . .

54C-37

DIAGNOSIS ITEM 5 . . . . . . . . . . . . . . . . . .

54C-47

DIAGNOSIS ITEM 6 . . . . . . . . . . . . . . . . . .

54C-57

DIAGNOSIS ITEM 7 . . . . . . . . . . . . . . . . . .

54C-60

DIAGNOSIS ITEM 8 . . . . . . . . . . . . . . . . . .

54C-63

DIAGNOSIS ITEM 9 . . . . . . . . . . . . . . . . . .

54C-67

DIAGNOSIS ITEM 10 . . . . . . . . . . . . . . . . .

54C-70

DIAGNOSIS ITEM 11 . . . . . . . . . . . . . . . . .

54C-73

DIAGNOSIS ITEM 12 . . . . . . . . . . . . . . . . .

54C-76

DIAGNOSIS ITEM 13 . . . . . . . . . . . . . . . . .

54C-79

DIAGNOSIS ITEM 14 . . . . . . . . . . . . . . . . .

54C-83

DIAGNOSIS ITEM 15 . . . . . . . . . . . . . . . . .

54C-86

DIAGNOSIS ITEM 16 . . . . . . . . . . . . . . . . .

54C-89

DIAGNOSIS ITEM 17 . . . . . . . . . . . . . . . . .

54C-92

DIAGNOSIS ITEM 18 . . . . . . . . . . . . . . . . .

54C-95

DIAGNOSIS ITEM 19 . . . . . . . . . . . . . . . . .

54C-99

DIAGNOSIS ITEM 20 . . . . . . . . . . . . . . . . .

54C-102

DIAGNOSIS ITEM 21 . . . . . . . . . . . . . . . . .

54C-105

DIAGNOSIS ITEM 22 . . . . . . . . . . . . . . . . .

54C-108

DIAGNOSIS ITEM 23 . . . . . . . . . . . . . . . . .

54C-111

DIAGNOSIS ITEM 24 . . . . . . . . . . . . . . . . .

54C-122

DIAGNOSIS ITEM 25 . . . . . . . . . . . . . . . . .

54C-125

CAN COMMUNICATION-RELATED
DIAGNOSIS CODE TABLE . . . . . . . .

54C-141

GENERAL INFORMATION

CONTROLLER AREA NETWORK (CAN)

54C-2

GENERAL INFORMATION

M1548310001895

CAN, an abbreviation for Controller Area Network, is
an ISO-certified international standard for a serial
multiplex communication protocol

*1

. A communica-

tion circuit employing the CAN protocol connects
each ECU, and sensor data can be shared among,
which enables more reduction in wiring.
NOTE:

*1

: The regulations have been decided in

detail, from software matters such as the necessary
transmission rate for communication, the system,
data format, and communication timing control
method to hardware matters such as the harness
type and length and the resistance values.

CAN offers the following advantages.

• Transmission rates are much faster than those in

conventional communication (up to 1 Mbps),
allowing much more data to be sent.

• It is exceptionally immune to noise, and the data

obtained from each error detection device is more
reliable.

• Each ECU connected via the CAN communicates

independently, therefore if the ECU enters dam-
aged mode, communications can be continued in
some cases.

GENERAL INFORMATION

CONTROLLER AREA NETWORK (CAN)

54C-3

STRUCTURE

ACB01902

Engine-ECU

SRS-ECU

Radio and
CD player*
or
CAN box
unit*

Combination
meter

WCM*
or
KOS-ECU*

M.U.T.-III

Diagnosis
connector

ETACS-ECU

ABS-ECU*
or
ASC-ECU*

CAN_H

CAN_L

Main bus line

CAN_H

CAN_L

CAN_H

CAN_L

CAN-C

CAN-B

Diagnosis CAN-C

AB

Terminal resistor

Terminal
resistor

: Indicates main bus line

: Indicates sub bus line

Main bus line

Steering
wheel
sensor

Headlamp
automatic
levelling-ECU

A/T-ECU*
or
CVT-ECU*

Electric
power
steering
-ECU

<Vehicles with
ASC or AFS>

<Vehicles with AFS>

NOTE:
*: ABS-ECU <Vehicles without ASC>
ASC-ECU <Vehicles with ASC>
A/T-ECU <A/T>
CVT-ECU <CVT>
Radio and CD player
<Vehicles with Radio and CD player>
CAN box unit <Vehicles with MMCS
(Vehicles for Russia)>
WCM <Vehicles without KOS>
KOS-ECU <Vehicles with KOS>
Corner sensor/back sensor-ECU
<Vehicles with reversing sensor system>
Heater control unit <Vehicles
without A/C>
A/C-ECU <Vehicles with A/C>

<Vehicles with
electric power steering>

<Vehicles with Automatic
Stop & Go (AS&G) system>

AS&G
-ECU

Corner
sensor/
back
sensor-ECU

*

Heater
control unit*
or A/C-ECU*

• A gateway function has been integrated to

ETACS-ECU as the network central ECU.

• The CAN system consists of the following three

networks: CAN-B (middle-speed body network),
CAN-C (high-speed power train network), and the
diagnosis CAN-C (diagnosis exclusive network).
Each ECU is connected to one of the networks
depending on its functions.

• The CAN bus line consists of two lines, CAN_L

and CAN_H (CAN Low and CAN High, respec-
tively), as well as two terminal resistors (A
twisted-pair cable, highly resistant to noise, is
used for the communications line).

• The CAN bus line connecting two dominant

ECUs is the main bus line, and the CAN bus line
connecting each ECU is the sub-bus line.

• With CAN-C, the terminal resistors are incorpo-

rated in ECU. Resistors with approximately 120
Ω is used for the dominant ECU, and that with 3.0
k

Ω is used for the non-dominant ECU.