CONTROLLER AREA NETWORK (CAN) SYSTEM

id094000001300


Outline

HS-CAN
•  With the addition of the following, the system wiring diagram and HS-CAN communication table have been added. (R.H.D. only)
―  PCM for SKYACTIV-G 2.0 engine
―  TCM for FW6A-EL type automatic transaxle
MS-CAN
•  With the addition of the following, the system wiring diagram and MS-CAN communication table have been added.
―  USB adapter

System Wiring Diagram


HS-CAN

R.H.D.

am3zzn00003186


MS-CAN

L.H.D.

am3zzw00010477

R.H.D.

am3zzn00003492


CAN signal table

•  Signals transmitted using the CAN system are as follows:

HS-CAN (ATX)

OUT: Output (sends signal)
IN: Input (receives signal)

Signal

Multiplex module

PCM

TCM*1

ABS HU/CM*2, DSC HU/CM*3

AFS control module

*4

BCM

EHPAS control module

Instrument cluster

Rear vehicle monitoring control module (RH)*5

SAS control module

Keyless control module*6
ABS request data
IN
–
OUT
–
–
–
–
–
–
–
ABS warning light on request
–
–
OUT
–
–
–
IN
–
–
–
ABS status
–
IN
(FS5A-EL)
OUT
–
–
–
IN
–
–
–
ABS request signal
IN
IN
OUT
–
–
–
–
–
–
–
IN
IN
(FW6A-EL)
OUT
–
–
–
–
–
IN
–
IN
IN
OUT
–
–
–
–
–
IN
–
IN
(SKYACTIV-G 2.0)
–
OUT
–
–
–
–
–
–
–
Accelerator pedal position
OUT
IN
(FS5A-EL, CVT)
IN
(DSC)
–
–
–
IN
IN
IN
–
ATX gear position
IN
(MZR 2.0, MZR 2.5)
OUT
–
–
–
–
–
–
–
–
IN
OUT
–
–
IN
–
IN
–
–
IN
OUT
(MZR 1.6)
–
–
–
IN
–
IN
–
–
IN
IN
OUT
(FS5A-EL, CVT)
–
–
–
–
IN
–
–
IN
OUT
(MZR 1.6)
–
–
–
–
–
IN
–
–
IN
IN
OUT
–
–
–
–
IN
–
–
–
OUT
(MZR 1.6)
–
–
–
–
–
IN
–
–
–
IN
OUT
(FS5A-EL, FW6A-EL)
IN
–
–
IN
–
IN
–
–
OUT
(MZR 1.6)
–
IN
–
–
IN
–
IN
–
–
ATX gear ratio
IN
(MZR 2.0, MZR 2.5)
OUT
–
–
–
–
–
–
–
–
IN
OUT
(FS5A-EL)
–
–
–
–
–
–
–
–
ATF temperature
IN
OUT
(FS5A-EL)
–
–
–
–
–
–
–
–
Air bag system warning light on request
–
–
–
–
–
–
OUT
–
IN
–
–
–
–
–
–
–
IN
–
OUT
–
Air bag system warning buzzer on request
–
–
–
–
–
–
IN
–
OUT
–
Air conditioner signal
OUT
(SKYACTIV-G 2.0)
–
–
–
IN
–
IN
–
–
–
Alarm status
–
–
–
–
OUT
–
IN
–
–
–
A/C on request
OUT
(MZR 1.5)
IN
–
–
–
–
–
–
–
–
A/C status
–
–
–
–
OUT
–
IN
–
–
–
OUT
(SKYACTIV-G 2.0)
–
–
–
–
–
IN
–
–
–
A/C operation request
IN
–
–
–
–
–
OUT
–
–
–
A/C operation status
–
–
–
–
OUT
–
IN
–
–
–
IN
(MZR 2.0, MZR 2.5, SKYACTIV-G 2.0)
–
–
–
–
–
OUT
–
–
–
Ambient air temperature
–
–
–
–
OUT
–
IN
–
–
–
Battery regeneration status
OUT
(SKYACTIV-G 2.0)
–
–
–
–
–
IN
–
–
–
Battery voltage
–
–
IN
–
–
–
OUT
–
–
–
Battery off
OUT
(MZR 1.5)
IN
–
–
–
–
–
–
–
–
Brake switch status
OUT
–
–
–
–
–
IN
–
–
–
OUT
(MZR 1.5)
IN
–
–
–
–
–
–
–
–
Brake pedal switch status
IN
–
–
–
–
–
OUT
–
–
–
OUT
–
IN
–
IN
–
–
–
IN
IN
Brake pedal status
OUT
IN
(FW6A-EL, FS5A-EL)
IN
–
IN
–
–
–
IN
IN
Brake fluid pressure
IN
(SKYACTIV-G 2.0)
OUT
IN
(DSC)
–
–
–
–
–
–
–
Brake system status
IN
IN
OUT
–
–
–
–
–
IN
–
IN
IN
OUT
–
–
–
–
–
–
–
Brake system warning light on request
–
–
OUT
–
–
–
IN
–
–
–
Blower speed
IN
–
–
–
–
–
OUT
–
–
–
Buckle switch status
(passenger)
–
–
–
–
–
–
IN
–
OUT
–
Buckle switch status
(driver)
IN
(SKYACTIV-G 2.0)
–
–
–
IN
–
IN
–
OUT
–
Brake fluid level
–
–
–
–
OUT
–
IN
–
–
–
Car configuration data
–
–
IN
–
–
–
OUT
–
–
–
Clutch cut switch status
IN
(SKYACTIV-G 2.0)
–
–
–
–
–
–
–
–
OUT
Cooling fan operation request
IN
OUT
(FS5A-EL)
–
–
–
–
–
–
–
–
Cranking time
OUT
–
–
–
–
–
–
–
–
IN
Cruise control system-related information
OUT
(MZR 2.0, MZR 2.5)
IN
–
–
–
–
–
–
–
–
IN
OUT
(FS5A-EL)
–
–
–
–
–
–
–
–
OUT
(MZR 2.0, MZR 2.5, MZR1.6, MZR 1.5)
–
–
–
–
–
IN
–
–
–
IN
OUT
(CVT)
–
–
–
–
–
–
–
–
Disabling of brake override system signal
OUT
(SKYACTIV-G 2.0)
–
–
–
–
–
IN
–
–
–
Dimmer cancel
–
–
–
–
IN
–
OUT
IN
–
–
Door switch status (LF, RF, LR, RR, liftgate)
IN
(SKYACTIV-G 2.0)
–
–
–
OUT
–
IN
–
–
–
Door lock link switch status
–
–
–
–
OUT
–
IN
–
–
–
Engine off time
IN
(SKYACTIV-G 2.0)
–
–
–
–
–
OUT
–
–
–
IN
(SKYACTIV-G 2.0)
IN
(FS5A-EL, FW6A-EL)
–
–
–
–
OUT
–
–
–
Engine load
OUT
(MZR 2.0, MZR 2.5)
IN
–
–
–
–
–
–
–
–
Engine brake torque
OUT
(MZR 2.0, MZR 2.5)
IN
–
–
–
–
–
–
–
–
Engine torque
OUT
–
IN
(DSC)
–
–
–
–
–
–
–
OUT
(MZR 1.5, CVT)
IN
–
–
–
–
–
–
–
–
Engine speed
OUT
(SKYACTIV-G 2.0)
IN
–
–
–
–
–
–
–
–
OUT
IN
(FS5A-EL)
IN
(DSC)
IN
IN
IN
IN
–
IN
IN
OUT
–
IN
(DSC)
–
–
–
–
–
–
–
OUT
(MZR 1.5)
IN
–
–
–
–
–
–
–
–
Engine coolant temperature
OUT
IN
(FS5A-EL, CVT)
–
–
–
–
IN
–
–
–
OUT
(MZR 2.0, MZR 2.5)
IN
–
–
–
–
–
–
–
–
Engine status at idle
OUT
(MZR 2.0, MZR 2.5, SKYACTIV-G 2.0)
–
–
–
–
–
IN
–
–
–
Engine exhaust volume
OUT
–
–
–
–
–
IN
–
–
–
Engine status (i-stop)
OUT
(SKYACTIV-G 2.0)
IN
IN
(DSC)
–
–
IN
IN
IN
–
IN
Engine status
OUT
–
–
–
–
–
IN
–
–
–
Engine torque status
OUT
(SKYACTIV-G 2.0)
–
IN
(DSC)
–
–
–
–
–
–
–
Engine status at idle
IN
OUT
(CVT)
–
–
–
–
–
–
–
–
OUT
(MZR 1.5)
IN
–
–
–
–
–
–
–
–
Emergency braking warning system-related information
–
–
OUT
–
IN
–
–
–
–
–
EHPAS status
IN
(SKYACTIV-G 2.0)
–
–
–
–
OUT
IN
–
–
–
Fuel cut permit
IN
OUT
(CVT)
–
–
–
–
–
–
–
–
Fuel cut status
OUT
(MZR 1.5)
IN
–
–
–
–
–
–
–
–
Fuel injection amount
OUT
–
–
–
–
–
IN
–
–
–
Fuel recovery status
OUT
(MZR 1.5)
IN
–
–
–
–
–
–
–
–
Fuel recover request
IN
OUT
(CVT)
–
–
–
–
–
–
–
–
Fuel tank level
IN
(MZR 2.0, MZR 2.5, SKYACTIV-G 2.0)
–
–
–
–
–
OUT
–
–
–
Fuel cap warning light on request
OUT
(MZR 2.0, MZR 2.5, SKYACTIV-G 2.0)
–
–
–
–
–
IN
–
–
–
Front pump status
IN
OUT
(CVT)
–
–
–
–
–
–
–
–
Front wiper status
IN
(MZR 1.5)
–
–
–
–
–
OUT
–
–
–
Front fog light status
–
–
–
–
OUT
–
IN
–
–
–
Freeze frame data
OUT
(MZR 2.0, MZR 2.5, MZR 1.5)
IN
–
–
–
–
–
–
–
–
G-sensor status
IN
OUT
(CVT)
–
–
–
–
–
–
–
–
Generator signal
OUT
(MZR 2.0, MZR 2.5)
IN
–
–
–
–
IN
–
–
–
Generator warning light illumination request
OUT
–
–
–
–
–
IN
–
–
–
Generator warning light on request
OUT
(SKYACTIV-G 2.0)
–
–
–
–
–
IN
–
–
–
HI beam indication
–
–
–
–
OUT
–
IN
–
–
–
Heater request status
IN
(SKYACTIV-G 2.0)
–
–
–
–
–
OUT
–
–
–
i-DM control status signal
OUT
(SKYACTIV-G 2.0)
–
–
–
–
–
IN
–
–
–
Idle speed
OUT
(MZR 2.0, MZR 2.5, SKYACTIV-G 2.0)
–
–
–
–
–
IN
–
–
–
i-stop related information
OUT
(SKYACTIV-G 2.0)
–
–
–
–
–
IN
–
–
–
OUT
(SKYACTIV-G 2.0)
–
IN
(DSC)
–
–
–
–
–
–
–
OUT
(SKYACTIV-G 2.0)
–
–
–
–
–
–
–
–
IN
IN
(SKYACTIV-G 2.0)
–
OUT
–
–
–
–
–
–
IN
IN
(SKYACTIV-G 2.0)
–
–
–
–
–
–
–
–
OUT
IN
(SKYACTIV-G 2.0)
–
–
–
–
–
OUT
–
–
–
i-stop warning light
OUT
(SKYACTIV-G 2.0)
IN
–
–
–
–
IN
–
–
–
i-stop control permit/inhibit based on battery condition
OUT
(SKYACTIV-G 2.0)
–
–
–
–
–
IN
–
–
–
Idling switch status
OUT
(MZR 1.5)
IN
–
–
–
–
–
–
–
–
Idle speed lower limit
IN
OUT
(CVT)
–
–
–
–
–
–
–
–
Idle increase request
IN
OUT
(CVT)
–
–
–
–
–
–
–
–
Intake air temperature
OUT
(MZR 2.0, MZR 2.5)
IN
–
–
–
–
–
–
–
–
Ignition key position
–
–
IN
–
–
–
OUT
–
–
–
Immobilizer-related information
OUT
–
–
–
–
–
IN
–
–
IN
IN
–
–
–
–
–
OUT
–
–
–
Key reminder switch status
–
–
–
–
OUT
–
IN
–
–
–
Keyless warning buzzer on request
–
–
–
–
–
–
IN
–
–
OUT
Keyless indicator light on request
–
–
–
–
–
–
IN
–
–
OUT
Keyless warning light on request
–
–
–
–
–
–
IN
–
–
OUT
Key status
OUT
–
–
–
–
–
–
–
–
IN
Leveling warning status
–
–
–
OUT
–
–
IN
–
–
–
Manual mode switch
IN
OUT
(CVT)
–
–
–
–
IN
–
–
–
Manual shift control-related information
–
IN
(FW6A-EL)
–
–
–
–
OUT
–
–
–
MIL on request
IN
OUT
(FS5A-EL, CVT)
–
–
–
–
–
–
–
–
OUT
(MZR 1.5)
IN
–
–
–
–
–
–
–
–
Maximum torque limit
IN
OUT
(CVT)
–
–
–
–
–
–
–
–
Neutral switch status
OUT
(MZR 1.6)
–
–
–
–
–
–
–
–
IN
Neutral range status
IN
OUT
(FS5A-EL)
–
–
–
–
–
–
–
–
Oil pressure switch status
IN
(SKYACTIV-G 2.0)
–
–
–
–
–
OUT
–
–
–
Oil pressure switch warning light illumination request
OUT
(SKYACTIV-G 2.0)
–
–
–
–
–
IN
–
–
–
Push button start system-related information
–
–
–
–
–
–
IN
–
–
OUT
Pedal control status
–
–
–
–
IN
–
OUT
–
–
–
Parking brake switch status
IN
(SKYACTIV-G 2.0)
–
–
–
OUT
–
IN
–
–
–
–
–
IN
(DSC)
–
–
IN
OUT
–
–
–
Passenger sensing system status
–
–
–
–
–
–
IN
–
OUT
–
Power supply status
IN
(SKYACTIV-G 2.0)
–
–
–
IN
–
–
–
–
OUT
Power consumption
IN
–
–
–
–
OUT
–
–
–
–
Rear window defroster status
IN
(SKYACTIV-G 2.0)
–
–
–
OUT
–
IN
–
–
–
Reverse gear switch status
IN
(SKYACTIV-G 2.0)
–
–
IN
OUT
–
IN
–
–
–
IN
–
–
–
–
–
OUT
–
–
–
Rear fog light status
–
–
–
–
OUT
–
IN
–
–
–
Running light status
IN
(MZR 1.6)
–
–
IN
OUT
–
IN
–
–
–
Room light status
–
–
–
–
OUT
–
IN
–
–
–
Rear window defroster request signal
–
–
–
–
IN
–
OUT
–
–
–
Rear vehicle monitoring status
–
–
–
–
–
–
IN
OUT
–
–
Rear vehicle monitoring buzzer on request
–
–
–
–
–
–
IN
OUT
–
–
Steering shift switch-related information
–
IN
(FW6A-EL)
–
–
–
–
OUT
–
–
–
Steering angle/steering angle sensor status
–
–
IN
(DSC)
–
OUT
–
–
–
–
–
IN
(SKYACTIV-G 2.0)
IN
(FW6A-EL)
IN
(DSC)
IN
OUT
–
–
–
IN
–
–
–
IN
(DSC)
–
OUT
IN
–
–
–
–
IN
(SKYACTIV-G 2.0)
IN
(FW6A-EL)
IN
–
OUT
IN
–
–
–
–
–
–
IN
(DSC)
–
OUT
–
–
–
–
–
IN
(SKYACTIV-G 2.0)
IN
(FW6A-EL)
IN
–
OUT
IN
–
–
IN
–
–
–
–
–
OUT
IN
–
–
–
–
Security light status
–
–
–
–
OUT
–
IN
–
–
–
Security light on request
–
–
–
–
–
–
IN
–
–
OUT
Shift-up request
OUT
–
–
–
–
–
IN
–
–
–
Shift indicator light
OUT
(MZR 1.6, SKYACTIV-G 2.0)
–
–
–
–
–
IN
–
–
–
Torque down request
IN
OUT
(FS5A-EL)
–
–
–
–
–
–
–
–
Tire speed
IN
(SKYACTIV-G 2.0)
–
OUT
–
–
–
–
–
–
–
Target gear position
IN
OUT
–
–
–
–
IN
–
–
–
OUT
(MZR 1.6)
–
–
–
–
–
IN
–
–
–
Torque converter status
IN
OUT
(FS5A-EL)
IN
–
–
–
–
–
–
–
–
OUT
IN
–
–
–
–
–
–
–
OUT
(MZR 1.6)
–
IN
–
–
–
–
–
–
–
IN
OUT
(CVT)
–
–
–
–
–
–
–
–
Torque converter rotation ratio
IN
OUT
(FS5A-EL)
–
–
–
–
–
–
–
–
Target torque
IN
OUT
(CVT)
–
–
–
–
–
–
–
–
Turbine shaft speed
IN
OUT
(CVT)
–
–
–
–
–
–
–
–
Turn indicator light on request
–
–
–
–
OUT
–
IN
–
–
–
Throttle position
OUT
(MZR 1.5)
IN
–
–
–
–
–
–
–
–
Transmission configuration
OUT
–
–
IN
–
–
–
–
–
–
Traveled distance
IN
(SKYACTIV-G 2.0)
IN
(FW6A-EL)
IN
–
–
–
OUT
–
–
–
Tire circumference
–
IN
(FW6A-EL)
IN
–
–
–
OUT
–
–
–
Travelled distance
OUT
–
–
–
–
–
IN
–
–
–
Transmission type
OUT
–
–
–
IN
–
–
–
–
IN
Tire circumference (front/rear)
OUT
(MZR 2.0, MZR 2.5, MZR 1.6, MZR 1.5)
IN
–
–
–
–
–
–
–
–
TNS status
IN
–
–
–
OUT
–
IN
IN
–
–
IN
(MZR 1.5)
–
–
–
–
–
OUT
–
–
–
Turn lever position
–
–
–
–
OUT
–
–
IN
–
–
Vehicle speed
OUT
–
–
IN
IN
IN
IN
IN
IN
IN
–
–
OUT
–
–
–
–
–
–
IN
IN
OUT
(CVT)
–
–
–
–
–
–
–
–
Wheel speed (LF, RF, LR, RR)
IN
IN
OUT
–
IN
–
–
IN
–
IN
Windshield wiper switch status
IN
–
–
–
OUT
–
IN
–
–
–
Yaw rate
–
–
OUT
–
–
–
–
IN
–
–
IN
(SKYACTIV-G 2.0)
IN
(FW6A-EL)
OUT
–
–
–
–
–
–
–

*1  :ATX or CVT
*2  :With ABS
*3  :With DSC
*4  :With AFS (adaptive front lighting system)
*5  :With rear vehicle monitoring system
*6  :With advanced keyless entry and push button start system

MS-CAN

OUT: Output (sends signal)
IN: Input (receives signal)

Signal

Multiplex module

AUDIO UNIT

MULTI INFORMATION DISPLAY/INFORMATION DISPLAY

USB ADAPTER
Text data
–
IN
OUT
Playback information
IN
–
OUT
OUT
IN
–
Operation signal
OUT
–
IN
USB device state
IN
–
OUT


Construction

•  The HS-CAN has terminator resistors built into the following units which form the CAN lines.
―  Between PCM (SKYACTIV-G 2.0) terminal 2AK (CAN_H)—2AL terminal (CAN_L), resistance value: 124 ohms
―  Between instrument cluster terminal 2B (CAN_H) — Terminal 2D (CAN_L), resistance value:120 ohms

Malfunction diagnosis procedure

•  If a vehicle with a malfunction in a system controlled by a CAN system related module is brought in, verify the repair order form and the malfunctioning symptom first, then perform CAN malfunction diagnosis to determine if the malfunction cause is in the CAN system or not.
•  For CAN malfunction diagnosis, the voltage at the CAN connection terminal on the DLC-2 is measured, and based on the measured value, the CAN circuit can be examined or the malfunction symptom can be determined.
•  If the malfunction symptom is not an open circuit, inspect the voltage or continuity at the CAN circuit and determine the malfunctioning part.
•  If the malfunction symptom is an open circuit, determine the area of the open circuit by using the displayed communication error DTC and the module in which communication has failed.

Example: determining open circuit location

1.  Verify the CAN system-related module DTCs and the failed module using the Mazda Modular Diagnostic System (M-MDS).

DTC output module (M-MDS display))

Displayed DTC

Description
PCM (PCM)
U0121:00
Communication error to DSC HU/CM
TCM (TCM)
U0121:00
Communication error to DSC HU/CM
Keyless control module (RKE)
U0121:00
Communication error to DSC HU/CM
Instrument cluster (IC)
U0121:00
Communication error to DSC HU/CM

Module

Fail
DSC HU/CM
×

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2.  Despite normal communication between the PCM and instrument cluster, a communication error DTC is displayed for the signal between the DSC HU/CM and PCM / TCM / keyless control module / instrument cluster. In addition, the wiring harness between the DSC HU/CM and connector C-41 is considered to be malfunctioning because “Fail” is displayed for the DSC HU/CM.