Mazda X-5. Manual - part 122

 

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Mazda X-5. Manual - part 122

 

 

CONTROL SYSTEM 

09–40–1

09–40

09–40

CONTROL SYSTEM

CONTROLLER AREA NETWORK (CAN)

SYSTEM OUTLINE . . . . . . . . . . . . . . . .  09–40–1

CAN SYSTEM STRUCTURAL VIEW  . . .  09–40–1
CAN SYSTEM WIRING DIAGRAM . . . . .  09–40–1
CAN SYSTEM DESCRIPTION  . . . . . . . .  09–40–2

Mechanism of CAN System-Related

Module . . . . . . . . . . . . . . . . . . . . . . . .  09–40–2

Twisted Pair . . . . . . . . . . . . . . . . . . . . . . 09–40–2
Time Division Multiplex . . . . . . . . . . . . . 09–40–3
Vehicle CAN System . . . . . . . . . . . . . . . 09–40–3
CAN Signal-Chart . . . . . . . . . . . . . . . . . 09–40–4
On-Board Diagnostic Function  . . . . . . . 09–40–5

End of Toc

CONTROLLER AREA NETWORK (CAN) SYSTEM OUTLINE

E5U094055430N01

• Due to the simplification of the wiring harness, a CAN system for transmission of multiplex input/output signals 

among electrical modules has been adopted.

• Twisted-pair wiring is used for connections between the following modules. (Each electrical module hereafter 

referred to as a CAN system-related module): 

— PCM

— TCM

— DSC HU/CM (with DSC)

— ABS HU/CM (with ABS)

— Keyless control module (with advanced keyless system)

— Steering angle sensor (with DSC)

— Instrument cluster

• With an on-board diagnostic function included for each multiplex module, display of DTCs using the WDS or 

equivalent has improved serviceability.

End Of Sie

CAN SYSTEM STRUCTURAL VIEW

E5U094055430N02

End Of Sie

CAN SYSTEM WIRING DIAGRAM

E5U094055430N03

End Of Sie

KEYLESS 
CONTROL MODULE

PCM

DSC HU/CM (WITH DSC)
ABS HU/CM (WITH ABS)

INSTRUMENT CLUSTER

TCM (

AT)

STEERING ANGLE 
SENSOR (WITH DSC)

E5U940ZS5001

F

E

Z

Y

1J

1L

CAN_H

CAN_L

DLC-2

1AI

1AM

4AA

4Z

1G

1C

PCM

ABS HU/CM 
(WITH ABS)

KEYLESS 
CONTROL MODULE 
(WITH ADVANCED 
KEYLESS SYSTEM)

TCM (AT)

INSTRUMENT 
CLUSTER

TWISTED PAIR

X

W

DSC HU/CM 
(WITH DSC)

E

F

STEERING 
ANGLE 
SENSOR 
(WITH DSC)

E5U940ZS5002

CONTROL SYSTEM 

09–40–2

CAN SYSTEM DESCRIPTION

E5U094055430N04

Mechanism of CAN System-Related Module

• A CAN system-related module is composed of an electrical circuit, CPU, and input/output interface.

• The size of the module has been reduced due to the elimination of the bulky, superfluous, input/output interface 

in the conventional type of electrical module.

• The CPU (multiplex block) controls all signals exchanged on the CAN harness.

• Communication with non-multiplex parts is carried out by conventional input/output interface.

• The functions of each component are shown below.

Twisted Pair

• The multichannel use two spirally twisted wires 

called a twisted pair, and each wire, CAN_L and 
CAN_H, has its own special function.

• Both bus lines are opposite phase voltage. This 

allows for minimal noise being emitted and makes 
if difficult for noise interference to be received.

Component

Function

Electrical circuit

Supplies power to CPU and vicinity, and to input/output interface.

CPU

Computation processing block Control function has been expanded, and when transmission is necessary, 

transmitted data is stored in a multiplex block. If a multiplex block receives a 
request to read stored data, transmitted data is read from the multiplex block.

Multiplex block

Transmits data received from bus line to computation processing block. In 
addition, sends transmitted data stored from computation processing block to 
bus line.

Input/Output interface

Electrically converts information signals from switches to, be input to CPU, 
and signals output from CPU for operating actuator or indicator lights.

INPUT 
SIGNAL

OUTPUT 
SIGNAL

CONNECTOR

INPUT 
INTERFACE

OUTPUT 
INTERFACE

CPU

CONVENTIONAL MODULE

CPU

CAN HARNESS 

(TWISTED PAIR)

CONVENTIONAL 
WIRING HARNESS

CONNECTOR

MULTIPLEX 
BLOCK

INPUT 
INTERFACE

OUTPUT 
INTERFACE

COMPUTATION 
PROCESSING BLOCK

CAN SYSTEM-RELATED MODULE

C3U0940S006

C A N _ H

C A N _ L

B3E0940T202

CONTROL SYSTEM 

09–40–3

09–40

Time Division Multiplex

• For information exchange between electrical modules in a conventional system, a wire connection was 

necessary for each information signal. However, by sending the different signal at varying times over one 
channel, it is possible to send a large amount of information via a small wiring harness.

• In the conventional, non-multiplex system, in order to control the illumination of the five bulbs, one switch and 

one channel was necessary for each bulb. For bulbs B and C to illuminate, switches B and C must be ON and 
electricity must flow through the channel. With the time multiplex system, this can be done through one 
channel. The channel is comprised of five data signal transmitters which transmit either a “0” or “1” signal to 
indicate whether a bulb turns ON or OFF. For example, to illuminate bulbs B and C, transmitters B and C 
transmit a “1” and transmitters A, D, and E transmit a “0”. When the receiver receives these signal, bulbs B and 
C illuminate.

Vehicle CAN System

• By rearranging the multiple signal, common information between the CAN system-related modules is 

transmitted and received through the multichannel.

• The signal transmitted by one CAN system-related module is sent through the multichannel to all the CAN 

system-related modules, but only the concerned module (s) receives the signal and performs the appropriate 
operation (ex. light illumination, fan operation).

A

0

0

0

1

1

0

0

0

1

1

0

0

0

1

1

0

0 0 1 1 0

0

0

1

1

0

0

0

1

1

B

C

D

E

A

B

C

D

E

A

A

B

C

D

0=OFF
1=ON

E

B

C

D

E

A

B

C

D

E

NON-MULTIPLEX SYSTEM

TIME DIVISION MULTIPLEX SYSTEM

EACH SIGNAL IS TRANSMITTED 
ONE BY ONE THROUGH THE 
CHANNEL  AS IT IS RECEIVED.

EACH SIGNAL IS OUTPUT ONE BY 
ONE AS IT IS RECEIVED FROM THE 
CHANNEL.

DATA

C3U0940S007

CONVENTIONAL
SYSTEM

ELECTRICAL
MODULE

ELECTRICAL
MODULE

ELECTRICAL
MODULE

CAN SYSTEM-
RELATED 
MODULE

CAN SYSTEM-
RELATED 
MODULE

CAN SYSTEM-
RELATED 
MODULE

CAN SYSTEM

A6A8111T006

CONTROL SYSTEM 

09–40–4

CAN Signal-Chart

OUT: Output (sends signal)

IN: Input (receives signal)

Signal

Multiplex module

PCM

TCM

ABS HU/CM 

or DSC HU/

CM

Keyless 

control 

module

Steering 

angle 

sensor

Instrument 

cluster

Engine speed

OUT

IN

IN (DSC)

IN

IN

Vehicle speed

OUT

IN

IN

IN

IN

OUT

Engine coolant temperature

OUT

IN

IN

Engine torque

OUT

IN

IN (DSC)

Accelerator pedal position

OUT

IN

IN (DSC)

TP

OUT

IN

IN  (DSC)

Intake air temperature

OUT

IN

Ignition timing

OUT

IN

Engine specification

OUT

IN

Brake pedal position

OUT

IN

Tire circumference (front/rear)

OUT

IN

IN

IN

OUT

Immobilizer-related information

OUT

IN

IN

OUT

Travelled distance

OUT

IN

IN

OUT

Fuel injection amount

OUT

IN

MIL on request

OUT

IN

OUT

Generator warning light on request

OUT

IN

Cruise main/set indicator light on 
request

OUT

IN

AT gear position/selector lever 
position (AT)

IN

OUT

IN

ATF temperature (AT)

IN

OUT

Desired gear position (AT)

IN

OUT

IN (DSC)

TCC status (AT)

IN

OUT

IN (DSC)

AT warning light on request (AT)

IN

OUT

IN

Brake system status (EBD/ABS/
DSC)

IN

OUT

Wheel speed (LF, RF, LR, RR)

IN

OUT

Brake system warning light on 
request

OUT

IN

ABS warning light on request

OUT

IN

DSC indicator light on request

OUT (DSC)

IN

DSC OFF light on request

OUT (DSC)

IN

Security light on request

OUT

IN

Steering angle sensor status

IN (DSC)

OUT

Fuel tank level

IN

OUT

Parking brake position

IN (DSC)

OUT

 

 

 

 

 

 

 

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